Ћир 
Eng 
FFH scientific research papers database
FFH database search (1991-2022):
1601.
Giba, Z; Grubišić, D; Todorović, S; Sajc, L; Stojaković, D; Konjević, R
Effect of nitric oxide - releasing compounds on phytochrome - Controlled germination of empress tree seeds Journal Article
In: Plant Growth Regulation, vol. 26, no. 3, pp. 175-181, 1998.
@article{Giba1998175,
title = {Effect of nitric oxide - releasing compounds on phytochrome - Controlled germination of empress tree seeds},
author = {Z Giba and D Grubišić and S Todorović and L Sajc and D Stojaković and R Konjević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032442515&doi=10.1023%2fA%3a1006131215297&partnerID=40&md5=6522826f42caf0fc88facd35946dc724},
doi = {10.1023/A:1006131215297},
year = {1998},
date = {1998-01-01},
journal = {Plant Growth Regulation},
volume = {26},
number = {3},
pages = {175-181},
abstract = {Using different nitric oxide releasing compounds and appropriate controls we have obtained data strongly suggesting the involvement of nitric oxide in the phytochrome controlled germination of Paulownia tomentosa seeds. Direct detection of nitric oxide, under various experimental conditions, was performed by a spin-trapping technique combined with electron paramagnetic resonance (EPR) spectroscopy. The addition of methylene blue prevented light-induced and NO donors-potentiated germination of P. tomentosa seeds. This inhibition could be completely overcome by addition of gibberellin. The promotive effect of nitrite was pH dependent, maximally pronounced at the pH range where nitrite undergoes dismutation and liberates nitric oxide. Under these conditions, nitrite exerted its efficacy at the same concentrations at which nitric oxide releasing compounds such as sodium nitroprusside (SNP), S-nitroso acetylpenicillamine (SNAP), and 3-morpholinosydnonimine (SIN-l), were the most effective. Likewise, the potentiation of P. tomentosa seed germination could be achieved by chemical reduction of nitrite with Na 2 S 2 O 4 during which liberation of nitric oxide could be detected.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Using different nitric oxide releasing compounds and appropriate controls we have obtained data strongly suggesting the involvement of nitric oxide in the phytochrome controlled germination of Paulownia tomentosa seeds. Direct detection of nitric oxide, under various experimental conditions, was performed by a spin-trapping technique combined with electron paramagnetic resonance (EPR) spectroscopy. The addition of methylene blue prevented light-induced and NO donors-potentiated germination of P. tomentosa seeds. This inhibition could be completely overcome by addition of gibberellin. The promotive effect of nitrite was pH dependent, maximally pronounced at the pH range where nitrite undergoes dismutation and liberates nitric oxide. Under these conditions, nitrite exerted its efficacy at the same concentrations at which nitric oxide releasing compounds such as sodium nitroprusside (SNP), S-nitroso acetylpenicillamine (SNAP), and 3-morpholinosydnonimine (SIN-l), were the most effective. Likewise, the potentiation of P. tomentosa seed germination could be achieved by chemical reduction of nitrite with Na 2 S 2 O 4 during which liberation of nitric oxide could be detected.
1602.
Čajkovski, T; Davidović, M; Čajkovski, D; Likar-Smiljanić, V; Biljić, R; Mioč, U; Stamenković, V
Dielectric properties of metal salts of heteropolyacid hydrates Journal Article
In: Solid State Phenomena, vol. 61-62, pp. 279-284, 1998.
@article{Čajkovski1998279,
title = {Dielectric properties of metal salts of heteropolyacid hydrates},
author = {T Čajkovski and M Davidović and D Čajkovski and V Likar-Smiljanić and R Biljić and U Mioč and V Stamenković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-17344371937&partnerID=40&md5=aea85e88aeaa32b6b04c2ad37e7173e7},
year = {1998},
date = {1998-01-01},
journal = {Solid State Phenomena},
volume = {61-62},
pages = {279-284},
abstract = {Heteropolyacids hydrates as superionic conductors have been intensely investigated during the last fifteen years. By using various experimental techniques such as IR and Raman spectroscopy, neutron scattering, impedance measurements, X-ray diffraction and others, informations have been obtained on the properties of protonic entities and conductivity mechanisms. The salts of heteropolyacids have been less investigated although there is a steady growth of activities in this field too. In this work the results of permittivity measurements are presented on copper and calcium salts of 12-tungstophosphoric acid hydrates (CuHPW12Q40·15H2O and CaHPW12O40·13H2O). Measurements have been done in the region of microwaves, at room temperature and in a room ambient. The aim of this work was to study the influence of copper and calcium ions on dielectric relaxation processes in these salts. Dieelectric relaxations have been found for both salts. Contributions of fast reorientations of H2O molecules and oxonium ions (H3O+) to these relaxations are discussed as well as, their influence on dynamic conductivity.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Heteropolyacids hydrates as superionic conductors have been intensely investigated during the last fifteen years. By using various experimental techniques such as IR and Raman spectroscopy, neutron scattering, impedance measurements, X-ray diffraction and others, informations have been obtained on the properties of protonic entities and conductivity mechanisms. The salts of heteropolyacids have been less investigated although there is a steady growth of activities in this field too. In this work the results of permittivity measurements are presented on copper and calcium salts of 12-tungstophosphoric acid hydrates (CuHPW12Q40·15H2O and CaHPW12O40·13H2O). Measurements have been done in the region of microwaves, at room temperature and in a room ambient. The aim of this work was to study the influence of copper and calcium ions on dielectric relaxation processes in these salts. Dieelectric relaxations have been found for both salts. Contributions of fast reorientations of H2O molecules and oxonium ions (H3O+) to these relaxations are discussed as well as, their influence on dynamic conductivity.
1603.
Sabo, T J; Grgurić, S R; Minić, D M; Trifunović, S R
In: Journal of Coordination Chemistry, vol. 44, no. 1-2, pp. 47-54, 1998.
@article{Sabo199847,
title = {Preparation and characterization of facial and meridional isomers of uns-cis-(ethylenediamine-N,N' -di-3-propionato)(glycinato)cobalt(III) semihydrate},
author = {T J Sabo and S R Grgurić and D M Minić and S R Trifunović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0002432498&doi=10.1080%2f00958979808022878&partnerID=40&md5=979472443370b1c2dc9c092215cf3935},
doi = {10.1080/00958979808022878},
year = {1998},
date = {1998-01-01},
journal = {Journal of Coordination Chemistry},
volume = {44},
number = {1-2},
pages = {47-54},
abstract = {Both theoretically possible geometrical isomers, facial and meridional, of uns-cis-(ethylenediamine-N,N'-di-3-propionato)(glycinato)cobalt(III) semi hydrate have been prepared by reaction of sodium uns-cis-(ethylenediamine-N,N'-di-3-propionato) (carbonato) cobaltate(III) with glycine at 75°C. The complexes have been isolated chromatographically and characterized by elemental analysis, electron absorption, infrared and nuclear magnetic spectra.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Both theoretically possible geometrical isomers, facial and meridional, of uns-cis-(ethylenediamine-N,N'-di-3-propionato)(glycinato)cobalt(III) semi hydrate have been prepared by reaction of sodium uns-cis-(ethylenediamine-N,N'-di-3-propionato) (carbonato) cobaltate(III) with glycine at 75°C. The complexes have been isolated chromatographically and characterized by elemental analysis, electron absorption, infrared and nuclear magnetic spectra.
1604.
Antic-Jovanovic, A; Vujisic, B R; Bojovic, V D; Pesic, D S
Rotational analysis of the B2Σ+ - X2Σ+ bands of 12C18O+ Journal Article
In: Spectroscopy Letters, vol. 31, no. 8, pp. 1783-1791, 1998.
@article{Antic-Jovanovic19981783,
title = {Rotational analysis of the B2Σ+ - X2Σ+ bands of 12C18O+},
author = {A Antic-Jovanovic and B R Vujisic and V D Bojovic and D S Pesic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-2442659415&doi=10.1080%2f00387019808007454&partnerID=40&md5=1071c9c30b647fee495bc5952bce254d},
doi = {10.1080/00387019808007454},
year = {1998},
date = {1998-01-01},
journal = {Spectroscopy Letters},
volume = {31},
number = {8},
pages = {1783-1791},
abstract = {The emission spectrum of the B2Σ+ - X2Σ+ (First Negative) system of the molecular ion 12C18O- have been photographed at a resolution sufficient to observe the spin splitting of the lines with N > 18. Four bands, 0-1, 0-3, 1-4 and 2-5, have been rotationally analyzed and the molecular constants of the B2Σ+ v = 0, 1, 2 and X2Σ+ v =1, 3, 4, 5 have been obtained.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The emission spectrum of the B2Σ+ - X2Σ+ (First Negative) system of the molecular ion 12C18O- have been photographed at a resolution sufficient to observe the spin splitting of the lines with N > 18. Four bands, 0-1, 0-3, 1-4 and 2-5, have been rotationally analyzed and the molecular constants of the B2Σ+ v = 0, 1, 2 and X2Σ+ v =1, 3, 4, 5 have been obtained.
1605.
Ribnikar, S V; Trtica, M S
Infrared spectra of uranyl compounds in alkali halide matrices: Oxalates and acetates Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 2, pp. 149-157, 1998.
@article{Ribnikar1998149,
title = {Infrared spectra of uranyl compounds in alkali halide matrices: Oxalates and acetates},
author = {S V Ribnikar and M S Trtica},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032326131&partnerID=40&md5=b917b8ab4877ec4d87e320b943c1bd04},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {2},
pages = {149-157},
abstract = {The infrared absorption spectra of uranyl oxalate and acetate in KBr matrices in the 4000-250 cm -1 range have been examined. Special attention was devoted to the dependence of the IR spetra on the sample treatment temperature and to the shape of the ν 3 bands appearing in the range of carbon dioxide laser radiation. Heat treatment up to some 270 °C leads to a narrowing of the band. Higher temperatures decompose the anions to carbon dioxide, while the uranyl ions are converted either to UO 2 or potassium diuranate.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The infrared absorption spectra of uranyl oxalate and acetate in KBr matrices in the 4000-250 cm -1 range have been examined. Special attention was devoted to the dependence of the IR spetra on the sample treatment temperature and to the shape of the ν 3 bands appearing in the range of carbon dioxide laser radiation. Heat treatment up to some 270 °C leads to a narrowing of the band. Higher temperatures decompose the anions to carbon dioxide, while the uranyl ions are converted either to UO 2 or potassium diuranate.
1606.
Jovančićević, B; Tasić, L; Wehner, H; Marković, D; Polić, P
n-alkane distribution as a tool in the identification of organic type pollution in river sediments Journal Article
In: Fresenius Environmental Bulletin, vol. 7, no. 5-6, pp. 320-326, 1998.
@article{Jovančićević1998320,
title = {n-alkane distribution as a tool in the identification of organic type pollution in river sediments},
author = {B Jovančićević and L Tasić and H Wehner and D Marković and P Polić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031949790&partnerID=40&md5=55d759e260c783eaa1e0cbb2bedd268e},
year = {1998},
date = {1998-01-01},
journal = {Fresenius Environmental Bulletin},
volume = {7},
number = {5-6},
pages = {320-326},
abstract = {An attempt was made to apply n-alkane distribution parameters in the identification of various organic matter pollution. Comparing the results of GC-analyses of n-alkanes in sewage-polluted river sediments with unpolluted sediments, it was shown that n-alkane distribution and abundance parameters offer a sound basis not only for the identification of oil-derived, but also for non-oil derived organic matter pollution in recent sediments.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An attempt was made to apply n-alkane distribution parameters in the identification of various organic matter pollution. Comparing the results of GC-analyses of n-alkanes in sewage-polluted river sediments with unpolluted sediments, it was shown that n-alkane distribution and abundance parameters offer a sound basis not only for the identification of oil-derived, but also for non-oil derived organic matter pollution in recent sediments.
1607.
Obradović, M V; Mitić, S S; Veselinović, D S; Nasković, D C
Spectrophotometric study of the reaction of molybdenum(VI) with sodium-pyrogallol-5-sulphonate. The determination of molybdenum Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 11, pp. 869-875, 1998.
@article{Obradović1998869,
title = {Spectrophotometric study of the reaction of molybdenum(VI) with sodium-pyrogallol-5-sulphonate. The determination of molybdenum},
author = {M V Obradović and S S Mitić and D S Veselinović and D C Nasković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032341374&partnerID=40&md5=bf503f35b93c0d86354f1382ac2db523},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {11},
pages = {869-875},
abstract = {On the basis of spectrophotometric measurements and applying the Job, Harvey-Manning, mole ratio and the Franck-Ostwald methods it has been found that, in acid media, molybdenum(VI) and sodium-pyrogallol-5-sulphonate (PS) form a complex [MoO 3 (PS) 2 ] 2 . The wide absorption maxima of this complex is at 314-375 nm. The stability constants of this complex were calculated by using the Job and the Franck-Ostwald methods. The thermodynamic values, ΔH o , ΔG o , and ΔS o , of the complex have also been calculated. A spectrophotometric method for molybdenum determination has been developed. The method is applied for the determination of molybdenum in steel.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
On the basis of spectrophotometric measurements and applying the Job, Harvey-Manning, mole ratio and the Franck-Ostwald methods it has been found that, in acid media, molybdenum(VI) and sodium-pyrogallol-5-sulphonate (PS) form a complex [MoO 3 (PS) 2 ] 2 . The wide absorption maxima of this complex is at 314-375 nm. The stability constants of this complex were calculated by using the Job and the Franck-Ostwald methods. The thermodynamic values, ΔH o , ΔG o , and ΔS o , of the complex have also been calculated. A spectrophotometric method for molybdenum determination has been developed. The method is applied for the determination of molybdenum in steel.
1608.
Knezevic, Z; Mojovic, L; Adnadjevic, B
Palm oil hydrolysis by lipase from Candida cylindracea immobilized on zeolite type Y Journal Article
In: Enzyme and Microbial Technology, vol. 22, no. 4, pp. 275-280, 1998.
@article{Knezevic1998275,
title = {Palm oil hydrolysis by lipase from Candida cylindracea immobilized on zeolite type Y},
author = {Z Knezevic and L Mojovic and B Adnadjevic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032032079&doi=10.1016%2fS0141-0229%2897%2900187-7&partnerID=40&md5=03eb6ccb2756d73fb5b00bca1763613f},
doi = {10.1016/S0141-0229(97)00187-7},
year = {1998},
date = {1998-01-01},
journal = {Enzyme and Microbial Technology},
volume = {22},
number = {4},
pages = {275-280},
abstract = {Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g -1 and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed. The activation energy for lipase adsorption on zeolite was 43 kJ mol -1 . The lipase immobilized on zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.
Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g -1 and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed. The activation energy for lipase adsorption on zeolite was 43 kJ mol -1 . The lipase immobilized on zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g -1 and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed. The activation energy for lipase adsorption on zeolite was 43 kJ mol -1 . The lipase immobilized on zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.
Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g -1 and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed. The activation energy for lipase adsorption on zeolite was 43 kJ mol -1 . The lipase immobilized on zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.
Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g -1 and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed. The activation energy for lipase adsorption on zeolite was 43 kJ mol -1 . The lipase immobilized on zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.
1609.
Djordjević, A; Vojinović-Miloradov, M; Petranović, N; Devečerski, A; Lazar, D; Ribar, B
Catalytic preparation and characterization of C60Br24 Journal Article
In: Fullerene Science and Technology, vol. 6, no. 4, pp. 689-694, 1998.
@article{Djordjević1998689,
title = {Catalytic preparation and characterization of C60Br24},
author = {A Djordjević and M Vojinović-Miloradov and N Petranović and A Devečerski and D Lazar and B Ribar},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032120503&doi=10.1080%2f10641229809350229&partnerID=40&md5=5862dd6d3f79710cb6ffc1e41de8da40},
doi = {10.1080/10641229809350229},
year = {1998},
date = {1998-01-01},
journal = {Fullerene Science and Technology},
volume = {6},
number = {4},
pages = {689-694},
abstract = {In this paper the procedure for catalytical bromination of C60 with elementary bromine with FeBr3 as a catalyst is described In this procedures only one reaction product - C60 Br24 is obtained. The twenty four bromine atoms are symmetrically distributed over the C60 sphere, which was confirmed by thermogravi metric analysis. The yield of bromine derivative in this reaction is 98%.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper the procedure for catalytical bromination of C60 with elementary bromine with FeBr3 as a catalyst is described In this procedures only one reaction product - C60 Br24 is obtained. The twenty four bromine atoms are symmetrically distributed over the C60 sphere, which was confirmed by thermogravi metric analysis. The yield of bromine derivative in this reaction is 98%.
1610.
Anić, S R
Relation between the number of oscillations and the activation energy of an oscillatory process Journal Article
In: Journal of the Serbian Chemical Society, vol. 62, no. 1, pp. 65-69, 1997.
@article{Anić199765,
title = {Relation between the number of oscillations and the activation energy of an oscillatory process},
author = {S R Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0040685798&partnerID=40&md5=9f0bbe345befd802ee790b43e4f675cc},
year = {1997},
date = {1997-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {62},
number = {1},
pages = {65-69},
abstract = {The number' of oscillations generated during the course of an oscillatory reaction in a closed reactor in considered to be a kinetic property that is useful for determination of the activation energy of an overall process. The method applicability is illustrated on the Bray-Liebhafsky oscillatory reaction.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The number' of oscillations generated during the course of an oscillatory reaction in a closed reactor in considered to be a kinetic property that is useful for determination of the activation energy of an overall process. The method applicability is illustrated on the Bray-Liebhafsky oscillatory reaction.
1611.
Šušić, M V
Kinetics of hydrogen absorption in a powdered SmCo5 alloy Journal Article
In: Journal of the Serbian Chemical Society, vol. 62, no. 4, pp. 349-351, 1997.
@article{Šušić1997349,
title = {Kinetics of hydrogen absorption in a powdered SmCo5 alloy},
author = {M V Šušić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0043232289&partnerID=40&md5=0c38f4e35660951d055927782d6e6176},
year = {1997},
date = {1997-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {62},
number = {4},
pages = {349-351},
abstract = {It is shown that the polycrystalline powdered intermetallic lanthanide SmCo5 may be brought to an active hydrogen absorber in the temperature range of 80 to 500 °C, with an enthalpy of 100 J/g or more. The most important kinetic and thermodynamic parameters of the process are determined, such as rate constants, enthalpics and energies of activation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
It is shown that the polycrystalline powdered intermetallic lanthanide SmCo5 may be brought to an active hydrogen absorber in the temperature range of 80 to 500 °C, with an enthalpy of 100 J/g or more. The most important kinetic and thermodynamic parameters of the process are determined, such as rate constants, enthalpics and energies of activation.
1612.
Fang, W -H; Peric, M; Peyerimhoff, S D
Ab initio study of the potential energy surfaces for the valence and Rydberg doublet electronic states of HNF Journal Article
In: Chemical Physics, vol. 223, no. 2-3, pp. 119-129, 1997.
@article{Fang1997119,
title = {Ab initio study of the potential energy surfaces for the valence and Rydberg doublet electronic states of HNF},
author = {W -H Fang and M Peric and S D Peyerimhoff},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031267675&doi=10.1016%2fS0301-0104%2897%2900221-8&partnerID=40&md5=093f473311cc286695c18ddca304f83d},
doi = {10.1016/S0301-0104(97)00221-8},
year = {1997},
date = {1997-01-01},
journal = {Chemical Physics},
volume = {223},
number = {2-3},
pages = {119-129},
abstract = {Results of large-scale configuration interaction calculations of the bending and N-F stretching potential curves for the low-lying doublet electronic states of HNF are presented. Special attention is paid to the investigation on valence and Rydberg character of the electronic states as well as the dissociation of HNF into NH and F atom. © 1997 Elsevier Science B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Results of large-scale configuration interaction calculations of the bending and N-F stretching potential curves for the low-lying doublet electronic states of HNF are presented. Special attention is paid to the investigation on valence and Rydberg character of the electronic states as well as the dissociation of HNF into NH and F atom. © 1997 Elsevier Science B.V.
1613.
Mioč, U B; Bogunović, Lj. J.; Ribnikar, S V; Raihstat, M M; Stanisavljev, B R
Hydrogen-bonded complexes of 1-chloro-2-methylpropan-2-ol with ketones Journal Article
In: Journal of Molecular Structure, vol. 416, no. 1-3, pp. 75-80, 1997.
@article{Mioč199775,
title = {Hydrogen-bonded complexes of 1-chloro-2-methylpropan-2-ol with ketones},
author = {U B Mioč and Lj.J. Bogunović and S V Ribnikar and M M Raihstat and B R Stanisavljev},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030727058&doi=10.1016%2fS0022-2860%2897%2900034-3&partnerID=40&md5=92533d60a9e611a2938cad375ea77c7a},
doi = {10.1016/S0022-2860(97)00034-3},
year = {1997},
date = {1997-01-01},
journal = {Journal of Molecular Structure},
volume = {416},
number = {1-3},
pages = {75-80},
abstract = {The interaction of 1-chloro-2-methylpropan-2-ol (CMP) with acetone and methyl ethyl ketone was examined in dilute carbon tetrachloride solution. The strengths of the hydrogen-bonded complexes were compared with those of the corresponding complexes of trimethyl carbinol and 1,1,1-trichloro-2-methyl-propan-2-ol with ketones. The aim was to explain the inductive effect of the chlorine atom on the strength of carbinol-ketone hydrogen-bonded complexes. The monomer IR band of CPM appears in solution as a composite of five sub-bands, signifying that many conformers are present; this was confirmed by quantum chemical calculation s. Chlorine substitution increases the strength of the hydrogen bond.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The interaction of 1-chloro-2-methylpropan-2-ol (CMP) with acetone and methyl ethyl ketone was examined in dilute carbon tetrachloride solution. The strengths of the hydrogen-bonded complexes were compared with those of the corresponding complexes of trimethyl carbinol and 1,1,1-trichloro-2-methyl-propan-2-ol with ketones. The aim was to explain the inductive effect of the chlorine atom on the strength of carbinol-ketone hydrogen-bonded complexes. The monomer IR band of CPM appears in solution as a composite of five sub-bands, signifying that many conformers are present; this was confirmed by quantum chemical calculation s. Chlorine substitution increases the strength of the hydrogen bond.
1614.
Šušić, M V
Kinetics of the process of isothermal hydriding and dehydriding of hydrogen absorbers Journal Article
In: International Journal of Hydrogen Energy, vol. 22, no. 6, pp. 585-589, 1997.
@article{Šušić1997585,
title = {Kinetics of the process of isothermal hydriding and dehydriding of hydrogen absorbers},
author = {M V Šušić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0040093679&partnerID=40&md5=e161a7a98472b4db3c317415eebf9b76},
year = {1997},
date = {1997-01-01},
journal = {International Journal of Hydrogen Energy},
volume = {22},
number = {6},
pages = {585-589},
abstract = {A kinetic analysis was done of the process of isothermal absorption and desorption (hydriding and dehydriding) of some metallic and non-metallic palladized or platinized hydrogen absorbers. Rate constants for both processes were determined for defined temperatures. It was shown that these processes proceed as exponential isotherms, following the relation Wt = W0 exp (-kt), where k is the rate constant of the process, W is the heat output in a DSC experiment, and t being the time passed. In all cases, the processes follow first order kinetics. Slopes of the linearized curves yield the wanted rate constants. From the enthalpies of dehydriding the hydrogen-to-absorber mole ratios were determined. © 1997 International Association for Hydrogen Energy.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A kinetic analysis was done of the process of isothermal absorption and desorption (hydriding and dehydriding) of some metallic and non-metallic palladized or platinized hydrogen absorbers. Rate constants for both processes were determined for defined temperatures. It was shown that these processes proceed as exponential isotherms, following the relation Wt = W0 exp (-kt), where k is the rate constant of the process, W is the heat output in a DSC experiment, and t being the time passed. In all cases, the processes follow first order kinetics. Slopes of the linearized curves yield the wanted rate constants. From the enthalpies of dehydriding the hydrogen-to-absorber mole ratios were determined. © 1997 International Association for Hydrogen Energy.
1615.
Dimitrijević, R; Kremenović, A; Dondur, V; Tomašević-Čanović, M; Mitrović, M
In: Journal of Physical Chemistry B, vol. 101, no. 20, pp. 3931-3936, 1997.
@article{Dimitrijević19973931,
title = {Thermally induced conversion of Sr-exchanged LTA- and FAU-framework zeolites. Syntheses, characterization, and polymorphism of ordered and disordered Sr 1-x Al 2-2x Si 2+2x O 8 (x = 0; 0.15), diphyllosilicate, and feldspar phases},
author = {R Dimitrijević and A Kremenović and V Dondur and M Tomašević-Čanović and M Mitrović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0000790031&partnerID=40&md5=e7bb9270cdf257102f980dd17701a520},
year = {1997},
date = {1997-01-01},
journal = {Journal of Physical Chemistry B},
volume = {101},
number = {20},
pages = {3931-3936},
abstract = {The thermal behavior of fully Sr-exchanged LTA- and FAU-framework zeolites was followed in the temperature range from ambient to 1500°C. Both zeolite frameworks collapsed into amorphous intermediate substances after heating between 780 and 950°C. Prolonged annealing of these products above 950°C induces their recrystallization to ordered hexagonal SrAl 2 Si 2 O 8 , [a 0 = 5.1970(2) Å, c 0 = 15.200(1) Å] and disordered hexagonal Sr 0.85 □ 0.15 Al 1.71 Si 2.29 O 8 [a 0 = 5.2039(2) Å, c 0 = 15.158(1) Å], diphyllosilicate phases, respectively. These phases are unstable under prolonged heating, and near 1100°C, they can be polymorphously transformed into corresponding Sr-feldspar LTA [a 0 = 8.358(2) Å, b 0 = 12.941(3) Å, c 0 = 7.114(1) Å, β = 115.26(2)°] and Sr-feldspar FAU [a 0 = 8.354(2) Å, b 0 = 12.957(3) Å, c 0 = 7.128(2) Å, β = 115.27(2)°] phases, maintaining framework cation-ordering characteristics. The phase conversions in the temperature range investigated were followed by thermal (DTA, TGA, and DSC), XRPD, and SEM analyses. The structural mechanism for M 1-x Al 2-2x Si 2+2x O 8 (M = Ca, Sr, Ba, Pb) polymorphous transformation from diphyllosilicate to feldspar topology is discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The thermal behavior of fully Sr-exchanged LTA- and FAU-framework zeolites was followed in the temperature range from ambient to 1500°C. Both zeolite frameworks collapsed into amorphous intermediate substances after heating between 780 and 950°C. Prolonged annealing of these products above 950°C induces their recrystallization to ordered hexagonal SrAl 2 Si 2 O 8 , [a 0 = 5.1970(2) Å, c 0 = 15.200(1) Å] and disordered hexagonal Sr 0.85 □ 0.15 Al 1.71 Si 2.29 O 8 [a 0 = 5.2039(2) Å, c 0 = 15.158(1) Å], diphyllosilicate phases, respectively. These phases are unstable under prolonged heating, and near 1100°C, they can be polymorphously transformed into corresponding Sr-feldspar LTA [a 0 = 8.358(2) Å, b 0 = 12.941(3) Å, c 0 = 7.114(1) Å, β = 115.26(2)°] and Sr-feldspar FAU [a 0 = 8.354(2) Å, b 0 = 12.957(3) Å, c 0 = 7.128(2) Å, β = 115.27(2)°] phases, maintaining framework cation-ordering characteristics. The phase conversions in the temperature range investigated were followed by thermal (DTA, TGA, and DSC), XRPD, and SEM analyses. The structural mechanism for M 1-x Al 2-2x Si 2+2x O 8 (M = Ca, Sr, Ba, Pb) polymorphous transformation from diphyllosilicate to feldspar topology is discussed.
1616.
Davidović, M; Čajkovski, T; Čajkovski, D; Likar-Smiljanić, V; Biljić, R; Mioč, U
Microwave X-band permittivity measurements on 12-tungstophosphoric acid hexahydrate Journal Article
In: Solid State Ionics, vol. 97, no. 1-4, pp. 233-238, 1997.
@article{Davidović1997233,
title = {Microwave X-band permittivity measurements on 12-tungstophosphoric acid hexahydrate},
author = {M Davidović and T Čajkovski and D Čajkovski and V Likar-Smiljanić and R Biljić and U Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031140338&partnerID=40&md5=47b2165f2e3f32926d1fd015524c28a7},
year = {1997},
date = {1997-01-01},
journal = {Solid State Ionics},
volume = {97},
number = {1-4},
pages = {233-238},
abstract = {Complex permittivity measurements of 12-tungstophosphoric acid hexahydrate (WPA·6H 2 O) have been performed in the X-band region at room temperature. Permittivity data were obtained by measuring reflection (S 11 ) and transmission (S 21 ) parameters with a network analyzer and also by using a short-circuited-waveguide. Results on powder samples are compared with the results on compressed samples using the model of mixtures. From Cole-Cole plots, a dipole relaxation time τ = 1.9 × 10 -11 s was determined and attributed to polyatomic ion reorientation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Complex permittivity measurements of 12-tungstophosphoric acid hexahydrate (WPA·6H 2 O) have been performed in the X-band region at room temperature. Permittivity data were obtained by measuring reflection (S 11 ) and transmission (S 21 ) parameters with a network analyzer and also by using a short-circuited-waveguide. Results on powder samples are compared with the results on compressed samples using the model of mixtures. From Cole-Cole plots, a dipole relaxation time τ = 1.9 × 10 -11 s was determined and attributed to polyatomic ion reorientation.
1617.
Mioč, U B; Milonjić, S K; Malović, D; Stamenković, V; Colomban, Ph.; Mitrović, M M; Dimitrijević, R
Structure and proton conductivity of 12-tungstophosphoric acid doped silica Journal Article
In: Solid State Ionics, vol. 97, no. 1-4, pp. 239-246, 1997.
@article{Mioč1997239,
title = {Structure and proton conductivity of 12-tungstophosphoric acid doped silica},
author = {U B Mioč and S K Milonjić and D Malović and V Stamenković and Ph. Colomban and M M Mitrović and R Dimitrijević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031141525&partnerID=40&md5=c662efedf41ad2e9772f9fe77f85c35d},
year = {1997},
date = {1997-01-01},
journal = {Solid State Ionics},
volume = {97},
number = {1-4},
pages = {239-246},
abstract = {Sol-gel syntheses offer a wide range of possibilities for introduction of materials with specific properties (electronic, optic and ion-conductive, etc.) into optically clear matrices. Preparation of silica gel bulk, containing 12-tungstophosphoric acid (WPA) in mesopores, as well as its structural and conduction characteristics are reported. Characteristics of the obtained doped gels depend on the gel preparation, gelation process and the WPA content. According to the obtained results, especially for the high conductivity (σ ≃0.1 S/cm), WPA doped silica gel is a promising material for solid electrolytes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Sol-gel syntheses offer a wide range of possibilities for introduction of materials with specific properties (electronic, optic and ion-conductive, etc.) into optically clear matrices. Preparation of silica gel bulk, containing 12-tungstophosphoric acid (WPA) in mesopores, as well as its structural and conduction characteristics are reported. Characteristics of the obtained doped gels depend on the gel preparation, gelation process and the WPA content. According to the obtained results, especially for the high conductivity (σ ≃0.1 S/cm), WPA doped silica gel is a promising material for solid electrolytes.
1618.
Baranac, J M; Petranović, N A; Dimitrić-Marković, J M
Spectrophotometric Study of Anthocyan Copigmentation Reactions. 3. Malvin and the Nonglycosidized Flavone Morin Journal Article
In: Journal of Agricultural and Food Chemistry, vol. 45, no. 5, pp. 1698-1700, 1997.
@article{Baranac19971698,
title = {Spectrophotometric Study of Anthocyan Copigmentation Reactions. 3. Malvin and the Nonglycosidized Flavone Morin},
author = {J M Baranac and N A Petranović and J M Dimitrić-Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0642333116&doi=10.1021%2fjf9606060&partnerID=40&md5=9d128a942d8ba72f78246947cc0215c3},
doi = {10.1021/jf9606060},
year = {1997},
date = {1997-01-01},
journal = {Journal of Agricultural and Food Chemistry},
volume = {45},
number = {5},
pages = {1698-1700},
abstract = {The process of copigmentation between malvin chloride (malvidin 3,5-diglucoside) and morin hydrate (3,5,7,2′4′-pentahydroxyflavone) was studied. The UV-vis absorption spectra were used to define the optimum conditions for the formation of copigment, as well as their characteristics. It was established that the copigmentation process does not depend only on the number of hydroxy groups but also on their mutual position. The copigment formation is spectrally manifested in a bathochromic and hyperchromic shift of the longest wavelength absorption band. The copigment formed is defined by kinetic and thermodynamic parameters.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The process of copigmentation between malvin chloride (malvidin 3,5-diglucoside) and morin hydrate (3,5,7,2′4′-pentahydroxyflavone) was studied. The UV-vis absorption spectra were used to define the optimum conditions for the formation of copigment, as well as their characteristics. It was established that the copigmentation process does not depend only on the number of hydroxy groups but also on their mutual position. The copigment formation is spectrally manifested in a bathochromic and hyperchromic shift of the longest wavelength absorption band. The copigment formed is defined by kinetic and thermodynamic parameters.
1619.
Baranac, J M; Petranović, N A; Dimitrić-Marković, J M
Spectrophotometric Study of Anthocyan Copigmentation Reactions. 4. Malvin and Apigenin 7-Glucoside Journal Article
In: Journal of Agricultural and Food Chemistry, vol. 45, no. 5, pp. 1701-1703, 1997.
@article{Baranac19971701,
title = {Spectrophotometric Study of Anthocyan Copigmentation Reactions. 4. Malvin and Apigenin 7-Glucoside},
author = {J M Baranac and N A Petranović and J M Dimitrić-Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0642302369&doi=10.1021%2fjf960612w&partnerID=40&md5=9fa64f9ecb881a58daf749331acc3ab5},
doi = {10.1021/jf960612w},
year = {1997},
date = {1997-01-01},
journal = {Journal of Agricultural and Food Chemistry},
volume = {45},
number = {5},
pages = {1701-1703},
abstract = {The existence of a copigmentation reaction was established between malvin chloride (malvidin 3,5-diglucoside) and apigenin 7-glucoside (5,4′-dihydroxyflavone 7-glucoside), and optimal conditions for its taking place were defined. Dependencies of the process on parameters such as the pH value of the solution, molecular concentration, and temperature were also determined. The kinetic and thermodynamic parameters obtained (K = 137 M-1, ΔG° = -12.2 kJ/mol, ΔH = -37.4 kJ/mol, ΔS = -84.6 J/K mol) were correlated with the structure of the flavone used.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The existence of a copigmentation reaction was established between malvin chloride (malvidin 3,5-diglucoside) and apigenin 7-glucoside (5,4′-dihydroxyflavone 7-glucoside), and optimal conditions for its taking place were defined. Dependencies of the process on parameters such as the pH value of the solution, molecular concentration, and temperature were also determined. The kinetic and thermodynamic parameters obtained (K = 137 M-1, ΔG° = -12.2 kJ/mol, ΔH = -37.4 kJ/mol, ΔS = -84.6 J/K mol) were correlated with the structure of the flavone used.
1620.
Baranac, J M; Petranović, N A; Dimitrić-Marković, J M
Spectrophotometric Study of Anthocyan Copigmentation Reactions. 2. Malvin and the Nonglycosidized Flavone Quercetin Journal Article
In: Journal of Agricultural and Food Chemistry, vol. 45, no. 5, pp. 1694-1697, 1997.
@article{Baranac19971694,
title = {Spectrophotometric Study of Anthocyan Copigmentation Reactions. 2. Malvin and the Nonglycosidized Flavone Quercetin},
author = {J M Baranac and N A Petranović and J M Dimitrić-Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0642271750&doi=10.1021%2fjf9606114&partnerID=40&md5=2aef1557b07a5de4f11c62075b8d4c04},
doi = {10.1021/jf9606114},
year = {1997},
date = {1997-01-01},
journal = {Journal of Agricultural and Food Chemistry},
volume = {45},
number = {5},
pages = {1694-1697},
abstract = {Using UV-vis spectrophotometry we have established that a process of copigmentation takes place between an anthocyan molecule, malvin chloride (malvidin 3,5-diglucoside), and a nonglycosidized pentahydroxyflavone, quercetin (3,5,7,3′,4′-pentahydroxyflavone). The kinetic and thermodynamic parameters, by which the process is characterized, were correlated to the structure, i.e., the nature and position of the substituents in the interacting molecules.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Using UV-vis spectrophotometry we have established that a process of copigmentation takes place between an anthocyan molecule, malvin chloride (malvidin 3,5-diglucoside), and a nonglycosidized pentahydroxyflavone, quercetin (3,5,7,3′,4′-pentahydroxyflavone). The kinetic and thermodynamic parameters, by which the process is characterized, were correlated to the structure, i.e., the nature and position of the substituents in the interacting molecules.
1998
Giba, Z; Grubišić, D; Todorović, S; Sajc, L; Stojaković, D; Konjević, R
Effect of nitric oxide - releasing compounds on phytochrome - Controlled germination of empress tree seeds Journal Article
In: Plant Growth Regulation, vol. 26, no. 3, pp. 175-181, 1998.
@article{Giba1998175,
title = {Effect of nitric oxide - releasing compounds on phytochrome - Controlled germination of empress tree seeds},
author = {Z Giba and D Grubišić and S Todorović and L Sajc and D Stojaković and R Konjević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032442515&doi=10.1023%2fA%3a1006131215297&partnerID=40&md5=6522826f42caf0fc88facd35946dc724},
doi = {10.1023/A:1006131215297},
year = {1998},
date = {1998-01-01},
journal = {Plant Growth Regulation},
volume = {26},
number = {3},
pages = {175-181},
abstract = {Using different nitric oxide releasing compounds and appropriate controls we have obtained data strongly suggesting the involvement of nitric oxide in the phytochrome controlled germination of Paulownia tomentosa seeds. Direct detection of nitric oxide, under various experimental conditions, was performed by a spin-trapping technique combined with electron paramagnetic resonance (EPR) spectroscopy. The addition of methylene blue prevented light-induced and NO donors-potentiated germination of P. tomentosa seeds. This inhibition could be completely overcome by addition of gibberellin. The promotive effect of nitrite was pH dependent, maximally pronounced at the pH range where nitrite undergoes dismutation and liberates nitric oxide. Under these conditions, nitrite exerted its efficacy at the same concentrations at which nitric oxide releasing compounds such as sodium nitroprusside (SNP), S-nitroso acetylpenicillamine (SNAP), and 3-morpholinosydnonimine (SIN-l), were the most effective. Likewise, the potentiation of P. tomentosa seed germination could be achieved by chemical reduction of nitrite with Na 2 S 2 O 4 during which liberation of nitric oxide could be detected.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Using different nitric oxide releasing compounds and appropriate controls we have obtained data strongly suggesting the involvement of nitric oxide in the phytochrome controlled germination of Paulownia tomentosa seeds. Direct detection of nitric oxide, under various experimental conditions, was performed by a spin-trapping technique combined with electron paramagnetic resonance (EPR) spectroscopy. The addition of methylene blue prevented light-induced and NO donors-potentiated germination of P. tomentosa seeds. This inhibition could be completely overcome by addition of gibberellin. The promotive effect of nitrite was pH dependent, maximally pronounced at the pH range where nitrite undergoes dismutation and liberates nitric oxide. Under these conditions, nitrite exerted its efficacy at the same concentrations at which nitric oxide releasing compounds such as sodium nitroprusside (SNP), S-nitroso acetylpenicillamine (SNAP), and 3-morpholinosydnonimine (SIN-l), were the most effective. Likewise, the potentiation of P. tomentosa seed germination could be achieved by chemical reduction of nitrite with Na 2 S 2 O 4 during which liberation of nitric oxide could be detected.
Čajkovski, T; Davidović, M; Čajkovski, D; Likar-Smiljanić, V; Biljić, R; Mioč, U; Stamenković, V
Dielectric properties of metal salts of heteropolyacid hydrates Journal Article
In: Solid State Phenomena, vol. 61-62, pp. 279-284, 1998.
@article{Čajkovski1998279,
title = {Dielectric properties of metal salts of heteropolyacid hydrates},
author = {T Čajkovski and M Davidović and D Čajkovski and V Likar-Smiljanić and R Biljić and U Mioč and V Stamenković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-17344371937&partnerID=40&md5=aea85e88aeaa32b6b04c2ad37e7173e7},
year = {1998},
date = {1998-01-01},
journal = {Solid State Phenomena},
volume = {61-62},
pages = {279-284},
abstract = {Heteropolyacids hydrates as superionic conductors have been intensely investigated during the last fifteen years. By using various experimental techniques such as IR and Raman spectroscopy, neutron scattering, impedance measurements, X-ray diffraction and others, informations have been obtained on the properties of protonic entities and conductivity mechanisms. The salts of heteropolyacids have been less investigated although there is a steady growth of activities in this field too. In this work the results of permittivity measurements are presented on copper and calcium salts of 12-tungstophosphoric acid hydrates (CuHPW12Q40·15H2O and CaHPW12O40·13H2O). Measurements have been done in the region of microwaves, at room temperature and in a room ambient. The aim of this work was to study the influence of copper and calcium ions on dielectric relaxation processes in these salts. Dieelectric relaxations have been found for both salts. Contributions of fast reorientations of H2O molecules and oxonium ions (H3O+) to these relaxations are discussed as well as, their influence on dynamic conductivity.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Heteropolyacids hydrates as superionic conductors have been intensely investigated during the last fifteen years. By using various experimental techniques such as IR and Raman spectroscopy, neutron scattering, impedance measurements, X-ray diffraction and others, informations have been obtained on the properties of protonic entities and conductivity mechanisms. The salts of heteropolyacids have been less investigated although there is a steady growth of activities in this field too. In this work the results of permittivity measurements are presented on copper and calcium salts of 12-tungstophosphoric acid hydrates (CuHPW12Q40·15H2O and CaHPW12O40·13H2O). Measurements have been done in the region of microwaves, at room temperature and in a room ambient. The aim of this work was to study the influence of copper and calcium ions on dielectric relaxation processes in these salts. Dieelectric relaxations have been found for both salts. Contributions of fast reorientations of H2O molecules and oxonium ions (H3O+) to these relaxations are discussed as well as, their influence on dynamic conductivity.
Sabo, T J; Grgurić, S R; Minić, D M; Trifunović, S R
In: Journal of Coordination Chemistry, vol. 44, no. 1-2, pp. 47-54, 1998.
@article{Sabo199847,
title = {Preparation and characterization of facial and meridional isomers of uns-cis-(ethylenediamine-N,N' -di-3-propionato)(glycinato)cobalt(III) semihydrate},
author = {T J Sabo and S R Grgurić and D M Minić and S R Trifunović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0002432498&doi=10.1080%2f00958979808022878&partnerID=40&md5=979472443370b1c2dc9c092215cf3935},
doi = {10.1080/00958979808022878},
year = {1998},
date = {1998-01-01},
journal = {Journal of Coordination Chemistry},
volume = {44},
number = {1-2},
pages = {47-54},
abstract = {Both theoretically possible geometrical isomers, facial and meridional, of uns-cis-(ethylenediamine-N,N'-di-3-propionato)(glycinato)cobalt(III) semi hydrate have been prepared by reaction of sodium uns-cis-(ethylenediamine-N,N'-di-3-propionato) (carbonato) cobaltate(III) with glycine at 75°C. The complexes have been isolated chromatographically and characterized by elemental analysis, electron absorption, infrared and nuclear magnetic spectra.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Both theoretically possible geometrical isomers, facial and meridional, of uns-cis-(ethylenediamine-N,N'-di-3-propionato)(glycinato)cobalt(III) semi hydrate have been prepared by reaction of sodium uns-cis-(ethylenediamine-N,N'-di-3-propionato) (carbonato) cobaltate(III) with glycine at 75°C. The complexes have been isolated chromatographically and characterized by elemental analysis, electron absorption, infrared and nuclear magnetic spectra.
Antic-Jovanovic, A; Vujisic, B R; Bojovic, V D; Pesic, D S
Rotational analysis of the B2Σ+ - X2Σ+ bands of 12C18O+ Journal Article
In: Spectroscopy Letters, vol. 31, no. 8, pp. 1783-1791, 1998.
@article{Antic-Jovanovic19981783,
title = {Rotational analysis of the B2Σ+ - X2Σ+ bands of 12C18O+},
author = {A Antic-Jovanovic and B R Vujisic and V D Bojovic and D S Pesic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-2442659415&doi=10.1080%2f00387019808007454&partnerID=40&md5=1071c9c30b647fee495bc5952bce254d},
doi = {10.1080/00387019808007454},
year = {1998},
date = {1998-01-01},
journal = {Spectroscopy Letters},
volume = {31},
number = {8},
pages = {1783-1791},
abstract = {The emission spectrum of the B2Σ+ - X2Σ+ (First Negative) system of the molecular ion 12C18O- have been photographed at a resolution sufficient to observe the spin splitting of the lines with N > 18. Four bands, 0-1, 0-3, 1-4 and 2-5, have been rotationally analyzed and the molecular constants of the B2Σ+ v = 0, 1, 2 and X2Σ+ v =1, 3, 4, 5 have been obtained.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The emission spectrum of the B2Σ+ - X2Σ+ (First Negative) system of the molecular ion 12C18O- have been photographed at a resolution sufficient to observe the spin splitting of the lines with N > 18. Four bands, 0-1, 0-3, 1-4 and 2-5, have been rotationally analyzed and the molecular constants of the B2Σ+ v = 0, 1, 2 and X2Σ+ v =1, 3, 4, 5 have been obtained.
Ribnikar, S V; Trtica, M S
Infrared spectra of uranyl compounds in alkali halide matrices: Oxalates and acetates Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 2, pp. 149-157, 1998.
@article{Ribnikar1998149,
title = {Infrared spectra of uranyl compounds in alkali halide matrices: Oxalates and acetates},
author = {S V Ribnikar and M S Trtica},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032326131&partnerID=40&md5=b917b8ab4877ec4d87e320b943c1bd04},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {2},
pages = {149-157},
abstract = {The infrared absorption spectra of uranyl oxalate and acetate in KBr matrices in the 4000-250 cm -1 range have been examined. Special attention was devoted to the dependence of the IR spetra on the sample treatment temperature and to the shape of the ν 3 bands appearing in the range of carbon dioxide laser radiation. Heat treatment up to some 270 °C leads to a narrowing of the band. Higher temperatures decompose the anions to carbon dioxide, while the uranyl ions are converted either to UO 2 or potassium diuranate.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The infrared absorption spectra of uranyl oxalate and acetate in KBr matrices in the 4000-250 cm -1 range have been examined. Special attention was devoted to the dependence of the IR spetra on the sample treatment temperature and to the shape of the ν 3 bands appearing in the range of carbon dioxide laser radiation. Heat treatment up to some 270 °C leads to a narrowing of the band. Higher temperatures decompose the anions to carbon dioxide, while the uranyl ions are converted either to UO 2 or potassium diuranate.
Jovančićević, B; Tasić, L; Wehner, H; Marković, D; Polić, P
n-alkane distribution as a tool in the identification of organic type pollution in river sediments Journal Article
In: Fresenius Environmental Bulletin, vol. 7, no. 5-6, pp. 320-326, 1998.
@article{Jovančićević1998320,
title = {n-alkane distribution as a tool in the identification of organic type pollution in river sediments},
author = {B Jovančićević and L Tasić and H Wehner and D Marković and P Polić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031949790&partnerID=40&md5=55d759e260c783eaa1e0cbb2bedd268e},
year = {1998},
date = {1998-01-01},
journal = {Fresenius Environmental Bulletin},
volume = {7},
number = {5-6},
pages = {320-326},
abstract = {An attempt was made to apply n-alkane distribution parameters in the identification of various organic matter pollution. Comparing the results of GC-analyses of n-alkanes in sewage-polluted river sediments with unpolluted sediments, it was shown that n-alkane distribution and abundance parameters offer a sound basis not only for the identification of oil-derived, but also for non-oil derived organic matter pollution in recent sediments.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An attempt was made to apply n-alkane distribution parameters in the identification of various organic matter pollution. Comparing the results of GC-analyses of n-alkanes in sewage-polluted river sediments with unpolluted sediments, it was shown that n-alkane distribution and abundance parameters offer a sound basis not only for the identification of oil-derived, but also for non-oil derived organic matter pollution in recent sediments.
Obradović, M V; Mitić, S S; Veselinović, D S; Nasković, D C
Spectrophotometric study of the reaction of molybdenum(VI) with sodium-pyrogallol-5-sulphonate. The determination of molybdenum Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 11, pp. 869-875, 1998.
@article{Obradović1998869,
title = {Spectrophotometric study of the reaction of molybdenum(VI) with sodium-pyrogallol-5-sulphonate. The determination of molybdenum},
author = {M V Obradović and S S Mitić and D S Veselinović and D C Nasković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032341374&partnerID=40&md5=bf503f35b93c0d86354f1382ac2db523},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {11},
pages = {869-875},
abstract = {On the basis of spectrophotometric measurements and applying the Job, Harvey-Manning, mole ratio and the Franck-Ostwald methods it has been found that, in acid media, molybdenum(VI) and sodium-pyrogallol-5-sulphonate (PS) form a complex [MoO 3 (PS) 2 ] 2 . The wide absorption maxima of this complex is at 314-375 nm. The stability constants of this complex were calculated by using the Job and the Franck-Ostwald methods. The thermodynamic values, ΔH o , ΔG o , and ΔS o , of the complex have also been calculated. A spectrophotometric method for molybdenum determination has been developed. The method is applied for the determination of molybdenum in steel.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
On the basis of spectrophotometric measurements and applying the Job, Harvey-Manning, mole ratio and the Franck-Ostwald methods it has been found that, in acid media, molybdenum(VI) and sodium-pyrogallol-5-sulphonate (PS) form a complex [MoO 3 (PS) 2 ] 2 . The wide absorption maxima of this complex is at 314-375 nm. The stability constants of this complex were calculated by using the Job and the Franck-Ostwald methods. The thermodynamic values, ΔH o , ΔG o , and ΔS o , of the complex have also been calculated. A spectrophotometric method for molybdenum determination has been developed. The method is applied for the determination of molybdenum in steel.
Knezevic, Z; Mojovic, L; Adnadjevic, B
Palm oil hydrolysis by lipase from Candida cylindracea immobilized on zeolite type Y Journal Article
In: Enzyme and Microbial Technology, vol. 22, no. 4, pp. 275-280, 1998.
@article{Knezevic1998275,
title = {Palm oil hydrolysis by lipase from Candida cylindracea immobilized on zeolite type Y},
author = {Z Knezevic and L Mojovic and B Adnadjevic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032032079&doi=10.1016%2fS0141-0229%2897%2900187-7&partnerID=40&md5=03eb6ccb2756d73fb5b00bca1763613f},
doi = {10.1016/S0141-0229(97)00187-7},
year = {1998},
date = {1998-01-01},
journal = {Enzyme and Microbial Technology},
volume = {22},
number = {4},
pages = {275-280},
abstract = {Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g -1 and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed. The activation energy for lipase adsorption on zeolite was 43 kJ mol -1 . The lipase immobilized on zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.
Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g -1 and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed. The activation energy for lipase adsorption on zeolite was 43 kJ mol -1 . The lipase immobilized on zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g -1 and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed. The activation energy for lipase adsorption on zeolite was 43 kJ mol -1 . The lipase immobilized on zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.
Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g -1 and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed. The activation energy for lipase adsorption on zeolite was 43 kJ mol -1 . The lipase immobilized on zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.
Lipase from Candida cylindracea immobilized on hydrophobic zeolite type Y was used to hydrolyze palm oil in a microaqueous two-phase reaction system containing isooctane as organic medium and lecithin as surfactant. The lipase was immobilized to zeolite by adsorption. The maximum amount of bound protein at 8.2 mg g -1 and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to zeolite were assessed by using the general model of topochemical reaction. Based on the values of the specific kinetic model parameters, we propose that the adsorption process is controlled by surface kinetics that was later experimentally confirmed. The activation energy for lipase adsorption on zeolite was 43 kJ mol -1 . The lipase immobilized on zeolite had 35% of the activity of the free enzyme. After the seventh cycle, immobilized lipase retained 10% of the initial activity in palm oil hydrolysis.
Djordjević, A; Vojinović-Miloradov, M; Petranović, N; Devečerski, A; Lazar, D; Ribar, B
Catalytic preparation and characterization of C60Br24 Journal Article
In: Fullerene Science and Technology, vol. 6, no. 4, pp. 689-694, 1998.
@article{Djordjević1998689,
title = {Catalytic preparation and characterization of C60Br24},
author = {A Djordjević and M Vojinović-Miloradov and N Petranović and A Devečerski and D Lazar and B Ribar},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032120503&doi=10.1080%2f10641229809350229&partnerID=40&md5=5862dd6d3f79710cb6ffc1e41de8da40},
doi = {10.1080/10641229809350229},
year = {1998},
date = {1998-01-01},
journal = {Fullerene Science and Technology},
volume = {6},
number = {4},
pages = {689-694},
abstract = {In this paper the procedure for catalytical bromination of C60 with elementary bromine with FeBr3 as a catalyst is described In this procedures only one reaction product - C60 Br24 is obtained. The twenty four bromine atoms are symmetrically distributed over the C60 sphere, which was confirmed by thermogravi metric analysis. The yield of bromine derivative in this reaction is 98%.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper the procedure for catalytical bromination of C60 with elementary bromine with FeBr3 as a catalyst is described In this procedures only one reaction product - C60 Br24 is obtained. The twenty four bromine atoms are symmetrically distributed over the C60 sphere, which was confirmed by thermogravi metric analysis. The yield of bromine derivative in this reaction is 98%.
1997
Anić, S R
Relation between the number of oscillations and the activation energy of an oscillatory process Journal Article
In: Journal of the Serbian Chemical Society, vol. 62, no. 1, pp. 65-69, 1997.
@article{Anić199765,
title = {Relation between the number of oscillations and the activation energy of an oscillatory process},
author = {S R Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0040685798&partnerID=40&md5=9f0bbe345befd802ee790b43e4f675cc},
year = {1997},
date = {1997-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {62},
number = {1},
pages = {65-69},
abstract = {The number' of oscillations generated during the course of an oscillatory reaction in a closed reactor in considered to be a kinetic property that is useful for determination of the activation energy of an overall process. The method applicability is illustrated on the Bray-Liebhafsky oscillatory reaction.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The number' of oscillations generated during the course of an oscillatory reaction in a closed reactor in considered to be a kinetic property that is useful for determination of the activation energy of an overall process. The method applicability is illustrated on the Bray-Liebhafsky oscillatory reaction.
Šušić, M V
Kinetics of hydrogen absorption in a powdered SmCo5 alloy Journal Article
In: Journal of the Serbian Chemical Society, vol. 62, no. 4, pp. 349-351, 1997.
@article{Šušić1997349,
title = {Kinetics of hydrogen absorption in a powdered SmCo5 alloy},
author = {M V Šušić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0043232289&partnerID=40&md5=0c38f4e35660951d055927782d6e6176},
year = {1997},
date = {1997-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {62},
number = {4},
pages = {349-351},
abstract = {It is shown that the polycrystalline powdered intermetallic lanthanide SmCo5 may be brought to an active hydrogen absorber in the temperature range of 80 to 500 °C, with an enthalpy of 100 J/g or more. The most important kinetic and thermodynamic parameters of the process are determined, such as rate constants, enthalpics and energies of activation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
It is shown that the polycrystalline powdered intermetallic lanthanide SmCo5 may be brought to an active hydrogen absorber in the temperature range of 80 to 500 °C, with an enthalpy of 100 J/g or more. The most important kinetic and thermodynamic parameters of the process are determined, such as rate constants, enthalpics and energies of activation.
Fang, W -H; Peric, M; Peyerimhoff, S D
Ab initio study of the potential energy surfaces for the valence and Rydberg doublet electronic states of HNF Journal Article
In: Chemical Physics, vol. 223, no. 2-3, pp. 119-129, 1997.
@article{Fang1997119,
title = {Ab initio study of the potential energy surfaces for the valence and Rydberg doublet electronic states of HNF},
author = {W -H Fang and M Peric and S D Peyerimhoff},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031267675&doi=10.1016%2fS0301-0104%2897%2900221-8&partnerID=40&md5=093f473311cc286695c18ddca304f83d},
doi = {10.1016/S0301-0104(97)00221-8},
year = {1997},
date = {1997-01-01},
journal = {Chemical Physics},
volume = {223},
number = {2-3},
pages = {119-129},
abstract = {Results of large-scale configuration interaction calculations of the bending and N-F stretching potential curves for the low-lying doublet electronic states of HNF are presented. Special attention is paid to the investigation on valence and Rydberg character of the electronic states as well as the dissociation of HNF into NH and F atom. © 1997 Elsevier Science B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Results of large-scale configuration interaction calculations of the bending and N-F stretching potential curves for the low-lying doublet electronic states of HNF are presented. Special attention is paid to the investigation on valence and Rydberg character of the electronic states as well as the dissociation of HNF into NH and F atom. © 1997 Elsevier Science B.V.
Mioč, U B; Bogunović, Lj. J.; Ribnikar, S V; Raihstat, M M; Stanisavljev, B R
Hydrogen-bonded complexes of 1-chloro-2-methylpropan-2-ol with ketones Journal Article
In: Journal of Molecular Structure, vol. 416, no. 1-3, pp. 75-80, 1997.
@article{Mioč199775,
title = {Hydrogen-bonded complexes of 1-chloro-2-methylpropan-2-ol with ketones},
author = {U B Mioč and Lj.J. Bogunović and S V Ribnikar and M M Raihstat and B R Stanisavljev},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030727058&doi=10.1016%2fS0022-2860%2897%2900034-3&partnerID=40&md5=92533d60a9e611a2938cad375ea77c7a},
doi = {10.1016/S0022-2860(97)00034-3},
year = {1997},
date = {1997-01-01},
journal = {Journal of Molecular Structure},
volume = {416},
number = {1-3},
pages = {75-80},
abstract = {The interaction of 1-chloro-2-methylpropan-2-ol (CMP) with acetone and methyl ethyl ketone was examined in dilute carbon tetrachloride solution. The strengths of the hydrogen-bonded complexes were compared with those of the corresponding complexes of trimethyl carbinol and 1,1,1-trichloro-2-methyl-propan-2-ol with ketones. The aim was to explain the inductive effect of the chlorine atom on the strength of carbinol-ketone hydrogen-bonded complexes. The monomer IR band of CPM appears in solution as a composite of five sub-bands, signifying that many conformers are present; this was confirmed by quantum chemical calculation s. Chlorine substitution increases the strength of the hydrogen bond.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The interaction of 1-chloro-2-methylpropan-2-ol (CMP) with acetone and methyl ethyl ketone was examined in dilute carbon tetrachloride solution. The strengths of the hydrogen-bonded complexes were compared with those of the corresponding complexes of trimethyl carbinol and 1,1,1-trichloro-2-methyl-propan-2-ol with ketones. The aim was to explain the inductive effect of the chlorine atom on the strength of carbinol-ketone hydrogen-bonded complexes. The monomer IR band of CPM appears in solution as a composite of five sub-bands, signifying that many conformers are present; this was confirmed by quantum chemical calculation s. Chlorine substitution increases the strength of the hydrogen bond.
Šušić, M V
Kinetics of the process of isothermal hydriding and dehydriding of hydrogen absorbers Journal Article
In: International Journal of Hydrogen Energy, vol. 22, no. 6, pp. 585-589, 1997.
@article{Šušić1997585,
title = {Kinetics of the process of isothermal hydriding and dehydriding of hydrogen absorbers},
author = {M V Šušić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0040093679&partnerID=40&md5=e161a7a98472b4db3c317415eebf9b76},
year = {1997},
date = {1997-01-01},
journal = {International Journal of Hydrogen Energy},
volume = {22},
number = {6},
pages = {585-589},
abstract = {A kinetic analysis was done of the process of isothermal absorption and desorption (hydriding and dehydriding) of some metallic and non-metallic palladized or platinized hydrogen absorbers. Rate constants for both processes were determined for defined temperatures. It was shown that these processes proceed as exponential isotherms, following the relation Wt = W0 exp (-kt), where k is the rate constant of the process, W is the heat output in a DSC experiment, and t being the time passed. In all cases, the processes follow first order kinetics. Slopes of the linearized curves yield the wanted rate constants. From the enthalpies of dehydriding the hydrogen-to-absorber mole ratios were determined. © 1997 International Association for Hydrogen Energy.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A kinetic analysis was done of the process of isothermal absorption and desorption (hydriding and dehydriding) of some metallic and non-metallic palladized or platinized hydrogen absorbers. Rate constants for both processes were determined for defined temperatures. It was shown that these processes proceed as exponential isotherms, following the relation Wt = W0 exp (-kt), where k is the rate constant of the process, W is the heat output in a DSC experiment, and t being the time passed. In all cases, the processes follow first order kinetics. Slopes of the linearized curves yield the wanted rate constants. From the enthalpies of dehydriding the hydrogen-to-absorber mole ratios were determined. © 1997 International Association for Hydrogen Energy.
Dimitrijević, R; Kremenović, A; Dondur, V; Tomašević-Čanović, M; Mitrović, M
In: Journal of Physical Chemistry B, vol. 101, no. 20, pp. 3931-3936, 1997.
@article{Dimitrijević19973931,
title = {Thermally induced conversion of Sr-exchanged LTA- and FAU-framework zeolites. Syntheses, characterization, and polymorphism of ordered and disordered Sr 1-x Al 2-2x Si 2+2x O 8 (x = 0; 0.15), diphyllosilicate, and feldspar phases},
author = {R Dimitrijević and A Kremenović and V Dondur and M Tomašević-Čanović and M Mitrović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0000790031&partnerID=40&md5=e7bb9270cdf257102f980dd17701a520},
year = {1997},
date = {1997-01-01},
journal = {Journal of Physical Chemistry B},
volume = {101},
number = {20},
pages = {3931-3936},
abstract = {The thermal behavior of fully Sr-exchanged LTA- and FAU-framework zeolites was followed in the temperature range from ambient to 1500°C. Both zeolite frameworks collapsed into amorphous intermediate substances after heating between 780 and 950°C. Prolonged annealing of these products above 950°C induces their recrystallization to ordered hexagonal SrAl 2 Si 2 O 8 , [a 0 = 5.1970(2) Å, c 0 = 15.200(1) Å] and disordered hexagonal Sr 0.85 □ 0.15 Al 1.71 Si 2.29 O 8 [a 0 = 5.2039(2) Å, c 0 = 15.158(1) Å], diphyllosilicate phases, respectively. These phases are unstable under prolonged heating, and near 1100°C, they can be polymorphously transformed into corresponding Sr-feldspar LTA [a 0 = 8.358(2) Å, b 0 = 12.941(3) Å, c 0 = 7.114(1) Å, β = 115.26(2)°] and Sr-feldspar FAU [a 0 = 8.354(2) Å, b 0 = 12.957(3) Å, c 0 = 7.128(2) Å, β = 115.27(2)°] phases, maintaining framework cation-ordering characteristics. The phase conversions in the temperature range investigated were followed by thermal (DTA, TGA, and DSC), XRPD, and SEM analyses. The structural mechanism for M 1-x Al 2-2x Si 2+2x O 8 (M = Ca, Sr, Ba, Pb) polymorphous transformation from diphyllosilicate to feldspar topology is discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The thermal behavior of fully Sr-exchanged LTA- and FAU-framework zeolites was followed in the temperature range from ambient to 1500°C. Both zeolite frameworks collapsed into amorphous intermediate substances after heating between 780 and 950°C. Prolonged annealing of these products above 950°C induces their recrystallization to ordered hexagonal SrAl 2 Si 2 O 8 , [a 0 = 5.1970(2) Å, c 0 = 15.200(1) Å] and disordered hexagonal Sr 0.85 □ 0.15 Al 1.71 Si 2.29 O 8 [a 0 = 5.2039(2) Å, c 0 = 15.158(1) Å], diphyllosilicate phases, respectively. These phases are unstable under prolonged heating, and near 1100°C, they can be polymorphously transformed into corresponding Sr-feldspar LTA [a 0 = 8.358(2) Å, b 0 = 12.941(3) Å, c 0 = 7.114(1) Å, β = 115.26(2)°] and Sr-feldspar FAU [a 0 = 8.354(2) Å, b 0 = 12.957(3) Å, c 0 = 7.128(2) Å, β = 115.27(2)°] phases, maintaining framework cation-ordering characteristics. The phase conversions in the temperature range investigated were followed by thermal (DTA, TGA, and DSC), XRPD, and SEM analyses. The structural mechanism for M 1-x Al 2-2x Si 2+2x O 8 (M = Ca, Sr, Ba, Pb) polymorphous transformation from diphyllosilicate to feldspar topology is discussed.
Davidović, M; Čajkovski, T; Čajkovski, D; Likar-Smiljanić, V; Biljić, R; Mioč, U
Microwave X-band permittivity measurements on 12-tungstophosphoric acid hexahydrate Journal Article
In: Solid State Ionics, vol. 97, no. 1-4, pp. 233-238, 1997.
@article{Davidović1997233,
title = {Microwave X-band permittivity measurements on 12-tungstophosphoric acid hexahydrate},
author = {M Davidović and T Čajkovski and D Čajkovski and V Likar-Smiljanić and R Biljić and U Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031140338&partnerID=40&md5=47b2165f2e3f32926d1fd015524c28a7},
year = {1997},
date = {1997-01-01},
journal = {Solid State Ionics},
volume = {97},
number = {1-4},
pages = {233-238},
abstract = {Complex permittivity measurements of 12-tungstophosphoric acid hexahydrate (WPA·6H 2 O) have been performed in the X-band region at room temperature. Permittivity data were obtained by measuring reflection (S 11 ) and transmission (S 21 ) parameters with a network analyzer and also by using a short-circuited-waveguide. Results on powder samples are compared with the results on compressed samples using the model of mixtures. From Cole-Cole plots, a dipole relaxation time τ = 1.9 × 10 -11 s was determined and attributed to polyatomic ion reorientation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Complex permittivity measurements of 12-tungstophosphoric acid hexahydrate (WPA·6H 2 O) have been performed in the X-band region at room temperature. Permittivity data were obtained by measuring reflection (S 11 ) and transmission (S 21 ) parameters with a network analyzer and also by using a short-circuited-waveguide. Results on powder samples are compared with the results on compressed samples using the model of mixtures. From Cole-Cole plots, a dipole relaxation time τ = 1.9 × 10 -11 s was determined and attributed to polyatomic ion reorientation.
Mioč, U B; Milonjić, S K; Malović, D; Stamenković, V; Colomban, Ph.; Mitrović, M M; Dimitrijević, R
Structure and proton conductivity of 12-tungstophosphoric acid doped silica Journal Article
In: Solid State Ionics, vol. 97, no. 1-4, pp. 239-246, 1997.
@article{Mioč1997239,
title = {Structure and proton conductivity of 12-tungstophosphoric acid doped silica},
author = {U B Mioč and S K Milonjić and D Malović and V Stamenković and Ph. Colomban and M M Mitrović and R Dimitrijević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031141525&partnerID=40&md5=c662efedf41ad2e9772f9fe77f85c35d},
year = {1997},
date = {1997-01-01},
journal = {Solid State Ionics},
volume = {97},
number = {1-4},
pages = {239-246},
abstract = {Sol-gel syntheses offer a wide range of possibilities for introduction of materials with specific properties (electronic, optic and ion-conductive, etc.) into optically clear matrices. Preparation of silica gel bulk, containing 12-tungstophosphoric acid (WPA) in mesopores, as well as its structural and conduction characteristics are reported. Characteristics of the obtained doped gels depend on the gel preparation, gelation process and the WPA content. According to the obtained results, especially for the high conductivity (σ ≃0.1 S/cm), WPA doped silica gel is a promising material for solid electrolytes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Sol-gel syntheses offer a wide range of possibilities for introduction of materials with specific properties (electronic, optic and ion-conductive, etc.) into optically clear matrices. Preparation of silica gel bulk, containing 12-tungstophosphoric acid (WPA) in mesopores, as well as its structural and conduction characteristics are reported. Characteristics of the obtained doped gels depend on the gel preparation, gelation process and the WPA content. According to the obtained results, especially for the high conductivity (σ ≃0.1 S/cm), WPA doped silica gel is a promising material for solid electrolytes.
Baranac, J M; Petranović, N A; Dimitrić-Marković, J M
Spectrophotometric Study of Anthocyan Copigmentation Reactions. 3. Malvin and the Nonglycosidized Flavone Morin Journal Article
In: Journal of Agricultural and Food Chemistry, vol. 45, no. 5, pp. 1698-1700, 1997.
@article{Baranac19971698,
title = {Spectrophotometric Study of Anthocyan Copigmentation Reactions. 3. Malvin and the Nonglycosidized Flavone Morin},
author = {J M Baranac and N A Petranović and J M Dimitrić-Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0642333116&doi=10.1021%2fjf9606060&partnerID=40&md5=9d128a942d8ba72f78246947cc0215c3},
doi = {10.1021/jf9606060},
year = {1997},
date = {1997-01-01},
journal = {Journal of Agricultural and Food Chemistry},
volume = {45},
number = {5},
pages = {1698-1700},
abstract = {The process of copigmentation between malvin chloride (malvidin 3,5-diglucoside) and morin hydrate (3,5,7,2′4′-pentahydroxyflavone) was studied. The UV-vis absorption spectra were used to define the optimum conditions for the formation of copigment, as well as their characteristics. It was established that the copigmentation process does not depend only on the number of hydroxy groups but also on their mutual position. The copigment formation is spectrally manifested in a bathochromic and hyperchromic shift of the longest wavelength absorption band. The copigment formed is defined by kinetic and thermodynamic parameters.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The process of copigmentation between malvin chloride (malvidin 3,5-diglucoside) and morin hydrate (3,5,7,2′4′-pentahydroxyflavone) was studied. The UV-vis absorption spectra were used to define the optimum conditions for the formation of copigment, as well as their characteristics. It was established that the copigmentation process does not depend only on the number of hydroxy groups but also on their mutual position. The copigment formation is spectrally manifested in a bathochromic and hyperchromic shift of the longest wavelength absorption band. The copigment formed is defined by kinetic and thermodynamic parameters.
Baranac, J M; Petranović, N A; Dimitrić-Marković, J M
Spectrophotometric Study of Anthocyan Copigmentation Reactions. 4. Malvin and Apigenin 7-Glucoside Journal Article
In: Journal of Agricultural and Food Chemistry, vol. 45, no. 5, pp. 1701-1703, 1997.
@article{Baranac19971701,
title = {Spectrophotometric Study of Anthocyan Copigmentation Reactions. 4. Malvin and Apigenin 7-Glucoside},
author = {J M Baranac and N A Petranović and J M Dimitrić-Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0642302369&doi=10.1021%2fjf960612w&partnerID=40&md5=9fa64f9ecb881a58daf749331acc3ab5},
doi = {10.1021/jf960612w},
year = {1997},
date = {1997-01-01},
journal = {Journal of Agricultural and Food Chemistry},
volume = {45},
number = {5},
pages = {1701-1703},
abstract = {The existence of a copigmentation reaction was established between malvin chloride (malvidin 3,5-diglucoside) and apigenin 7-glucoside (5,4′-dihydroxyflavone 7-glucoside), and optimal conditions for its taking place were defined. Dependencies of the process on parameters such as the pH value of the solution, molecular concentration, and temperature were also determined. The kinetic and thermodynamic parameters obtained (K = 137 M-1, ΔG° = -12.2 kJ/mol, ΔH = -37.4 kJ/mol, ΔS = -84.6 J/K mol) were correlated with the structure of the flavone used.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The existence of a copigmentation reaction was established between malvin chloride (malvidin 3,5-diglucoside) and apigenin 7-glucoside (5,4′-dihydroxyflavone 7-glucoside), and optimal conditions for its taking place were defined. Dependencies of the process on parameters such as the pH value of the solution, molecular concentration, and temperature were also determined. The kinetic and thermodynamic parameters obtained (K = 137 M-1, ΔG° = -12.2 kJ/mol, ΔH = -37.4 kJ/mol, ΔS = -84.6 J/K mol) were correlated with the structure of the flavone used.
Baranac, J M; Petranović, N A; Dimitrić-Marković, J M
Spectrophotometric Study of Anthocyan Copigmentation Reactions. 2. Malvin and the Nonglycosidized Flavone Quercetin Journal Article
In: Journal of Agricultural and Food Chemistry, vol. 45, no. 5, pp. 1694-1697, 1997.
@article{Baranac19971694,
title = {Spectrophotometric Study of Anthocyan Copigmentation Reactions. 2. Malvin and the Nonglycosidized Flavone Quercetin},
author = {J M Baranac and N A Petranović and J M Dimitrić-Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0642271750&doi=10.1021%2fjf9606114&partnerID=40&md5=2aef1557b07a5de4f11c62075b8d4c04},
doi = {10.1021/jf9606114},
year = {1997},
date = {1997-01-01},
journal = {Journal of Agricultural and Food Chemistry},
volume = {45},
number = {5},
pages = {1694-1697},
abstract = {Using UV-vis spectrophotometry we have established that a process of copigmentation takes place between an anthocyan molecule, malvin chloride (malvidin 3,5-diglucoside), and a nonglycosidized pentahydroxyflavone, quercetin (3,5,7,3′,4′-pentahydroxyflavone). The kinetic and thermodynamic parameters, by which the process is characterized, were correlated to the structure, i.e., the nature and position of the substituents in the interacting molecules.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Using UV-vis spectrophotometry we have established that a process of copigmentation takes place between an anthocyan molecule, malvin chloride (malvidin 3,5-diglucoside), and a nonglycosidized pentahydroxyflavone, quercetin (3,5,7,3′,4′-pentahydroxyflavone). The kinetic and thermodynamic parameters, by which the process is characterized, were correlated to the structure, i.e., the nature and position of the substituents in the interacting molecules.