TY  - JOUR
AU  - Babić, Dragan
AU  - Nikolic, R
AU  - Gadžurić, Slobodan
AU  - Zsigrai, Istvan J.
PY  - 2001
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2505
AB  - Specific conductivity of molten mixtures of acetamide with following acetate salts was measured at 83 +/- 0.1degreesC : a) acetamide - anhydrous sodium acetate (up to 0.051 mole fraction), b) acetainide sodium acetate trihydrate (entire concentration range) and c) acetamide - zinc acetate dihydrate ( up to 0.24 mole fraction). Selected composition of all three mixtures, with low melting points were chosen for the studies of the changes of conductance with temperature. The mixtures: with sodium acetate both anhydrous and hydrated showed fairly high specific conductivity (approximate to10(-2) S/cm), nearly two orders of magnitude higher than the mixture with hydrated zinc acetate. Molar conductivity was also calculated. The results were discussed in terms of acetamide-salt-water interactions. Attempts were made to calculate the degree of dissociation of the salts in molten acetamide. The results were compared with the data obtained from earlier thermochemical studies of the same melt systems.
T2  - High Temperature Material Processes
T1  - Electrical conductivity of the acetamide-acetate salt melts
VL  - 5
IS  - 4
SP  - 595
EP  - 602
UR  - https://hdl.handle.net/21.15107/rcub_vinar_2505
ER  - 

@article{
author = "Babić, Dragan and Nikolic, R and Gadžurić, Slobodan and Zsigrai, Istvan J.",
year = "2001",
abstract = "Specific conductivity of molten mixtures of acetamide with following acetate salts was measured at 83 +/- 0.1degreesC : a) acetamide - anhydrous sodium acetate (up to 0.051 mole fraction), b) acetainide sodium acetate trihydrate (entire concentration range) and c) acetamide - zinc acetate dihydrate ( up to 0.24 mole fraction). Selected composition of all three mixtures, with low melting points were chosen for the studies of the changes of conductance with temperature. The mixtures: with sodium acetate both anhydrous and hydrated showed fairly high specific conductivity (approximate to10(-2) S/cm), nearly two orders of magnitude higher than the mixture with hydrated zinc acetate. Molar conductivity was also calculated. The results were discussed in terms of acetamide-salt-water interactions. Attempts were made to calculate the degree of dissociation of the salts in molten acetamide. The results were compared with the data obtained from earlier thermochemical studies of the same melt systems.",
journal = "High Temperature Material Processes",
title = "Electrical conductivity of the acetamide-acetate salt melts",
volume = "5",
number = "4",
pages = "595-602",
url = "https://hdl.handle.net/21.15107/rcub_vinar_2505"
}

Babić, D., Nikolic, R., Gadžurić, S.,& Zsigrai, I. J.. (2001). Electrical conductivity of the acetamide-acetate salt melts. in High Temperature Material Processes, 5(4), 595-602.
https://hdl.handle.net/21.15107/rcub_vinar_2505

Babić D, Nikolic R, Gadžurić S, Zsigrai IJ. Electrical conductivity of the acetamide-acetate salt melts. in High Temperature Material Processes. 2001;5(4):595-602.
https://hdl.handle.net/21.15107/rcub_vinar_2505 .

Babić, Dragan, Nikolic, R, Gadžurić, Slobodan, Zsigrai, Istvan J., "Electrical conductivity of the acetamide-acetate salt melts" in High Temperature Material Processes, 5, no. 4 (2001):595-602,
https://hdl.handle.net/21.15107/rcub_vinar_2505 .

TY  - JOUR
AU  - Zsigrai, Istvan J.
AU  - Gadžurić, Slobodan
AU  - Nikolic, R
PY  - 2001
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2504
AB  - In this work a series of spectrophotometric measurements of cobalt(II) chloride in calcium nitrate tetrahydrate melts containing variable amounts of calcium chloride (from 0 to 3.1 mol dm(-3)) were performed at different temperatures from 40 to 70 degreesC. The solutions in pure calcium nitrate tetrahydrate showed octahedral co-ordination, the position of the absorption maximum being at 19420 cm(-1) (512 nm). Addition of chloride caused a shift of the absorption maximum toward lower energies and a large increase of the absorption coefficient indicating a change from octahedral to tetrahedral or distorted octahedral co-ordination, characteristic for cobalt(II) chloride complexes in aqueous nitrate melts. The position of the absorption maximum of the octahedral and tetrahedral complexes and the values of the molar absorption coefficients indicates some co-ordination also by nitrate ion. Stability constants for [CO(NO3)(4)](2-), [CO(NO3)(2)Cl-2](2-) and [COCl4](2-) and the corresponding resolved species spectra are reported.
T2  - High Temperature Material Processes
T1  - Cobalt(II) chloride complexes in calcium nitrate tetrahydrate melt
VL  - 5
IS  - 4
SP  - 573
EP  - 581
UR  - https://hdl.handle.net/21.15107/rcub_vinar_2504
ER  - 

@article{
author = "Zsigrai, Istvan J. and Gadžurić, Slobodan and Nikolic, R",
year = "2001",
abstract = "In this work a series of spectrophotometric measurements of cobalt(II) chloride in calcium nitrate tetrahydrate melts containing variable amounts of calcium chloride (from 0 to 3.1 mol dm(-3)) were performed at different temperatures from 40 to 70 degreesC. The solutions in pure calcium nitrate tetrahydrate showed octahedral co-ordination, the position of the absorption maximum being at 19420 cm(-1) (512 nm). Addition of chloride caused a shift of the absorption maximum toward lower energies and a large increase of the absorption coefficient indicating a change from octahedral to tetrahedral or distorted octahedral co-ordination, characteristic for cobalt(II) chloride complexes in aqueous nitrate melts. The position of the absorption maximum of the octahedral and tetrahedral complexes and the values of the molar absorption coefficients indicates some co-ordination also by nitrate ion. Stability constants for [CO(NO3)(4)](2-), [CO(NO3)(2)Cl-2](2-) and [COCl4](2-) and the corresponding resolved species spectra are reported.",
journal = "High Temperature Material Processes",
title = "Cobalt(II) chloride complexes in calcium nitrate tetrahydrate melt",
volume = "5",
number = "4",
pages = "573-581",
url = "https://hdl.handle.net/21.15107/rcub_vinar_2504"
}

Zsigrai, I. J., Gadžurić, S.,& Nikolic, R.. (2001). Cobalt(II) chloride complexes in calcium nitrate tetrahydrate melt. in High Temperature Material Processes, 5(4), 573-581.
https://hdl.handle.net/21.15107/rcub_vinar_2504

Zsigrai IJ, Gadžurić S, Nikolic R. Cobalt(II) chloride complexes in calcium nitrate tetrahydrate melt. in High Temperature Material Processes. 2001;5(4):573-581.
https://hdl.handle.net/21.15107/rcub_vinar_2504 .

Zsigrai, Istvan J., Gadžurić, Slobodan, Nikolic, R, "Cobalt(II) chloride complexes in calcium nitrate tetrahydrate melt" in High Temperature Material Processes, 5, no. 4 (2001):573-581,
https://hdl.handle.net/21.15107/rcub_vinar_2504 .

TY  - JOUR
AU  - Gadžurić, Slobodan
AU  - Zsigrai, Istvan J.
AU  - Nikolic, RM
PY  - 2001
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2498
AB  - The complex formation between lead(II) ions and chloride and bromide ions in melts of Ca(NO3)(2 .) 4H(2)O . aCH(3)CONH(2) has been studied at different temperatures between 30 and 70 C. The formation constants of the complexes PbX+ and PbX2 (X = Cl, Br) were determined from emf measurements by means of Ag/AgX electrodes. The dependence of the formation constants for PbCl+ on the solvent melt composition has been analysed. The thermodynamic parameters DeltaH(11)(0) and DeltaS(11)(0) for PbX+ complex formation have been estimated. The parameters are compared with the literature data for the same process in dilute aqueous solutions and in some hydrated and anhydrous salt melts.
T2  - Zeitschrift fur Naturforschung. Section A: Journal of Physical Sciences
T1  - Thermodynamics of lead(II) halide complex formation in calcium nitrate tetrahydrate - Acetamide melts
VL  - 56
IS  - 12
SP  - 832
EP  - 836
UR  - https://hdl.handle.net/21.15107/rcub_vinar_2498
ER  - 

@article{
author = "Gadžurić, Slobodan and Zsigrai, Istvan J. and Nikolic, RM",
year = "2001",
abstract = "The complex formation between lead(II) ions and chloride and bromide ions in melts of Ca(NO3)(2 .) 4H(2)O . aCH(3)CONH(2) has been studied at different temperatures between 30 and 70 C. The formation constants of the complexes PbX+ and PbX2 (X = Cl, Br) were determined from emf measurements by means of Ag/AgX electrodes. The dependence of the formation constants for PbCl+ on the solvent melt composition has been analysed. The thermodynamic parameters DeltaH(11)(0) and DeltaS(11)(0) for PbX+ complex formation have been estimated. The parameters are compared with the literature data for the same process in dilute aqueous solutions and in some hydrated and anhydrous salt melts.",
journal = "Zeitschrift fur Naturforschung. Section A: Journal of Physical Sciences",
title = "Thermodynamics of lead(II) halide complex formation in calcium nitrate tetrahydrate - Acetamide melts",
volume = "56",
number = "12",
pages = "832-836",
url = "https://hdl.handle.net/21.15107/rcub_vinar_2498"
}

Gadžurić, S., Zsigrai, I. J.,& Nikolic, R.. (2001). Thermodynamics of lead(II) halide complex formation in calcium nitrate tetrahydrate - Acetamide melts. in Zeitschrift fur Naturforschung. Section A: Journal of Physical Sciences, 56(12), 832-836.
https://hdl.handle.net/21.15107/rcub_vinar_2498

Gadžurić S, Zsigrai IJ, Nikolic R. Thermodynamics of lead(II) halide complex formation in calcium nitrate tetrahydrate - Acetamide melts. in Zeitschrift fur Naturforschung. Section A: Journal of Physical Sciences. 2001;56(12):832-836.
https://hdl.handle.net/21.15107/rcub_vinar_2498 .

Gadžurić, Slobodan, Zsigrai, Istvan J., Nikolic, RM, "Thermodynamics of lead(II) halide complex formation in calcium nitrate tetrahydrate - Acetamide melts" in Zeitschrift fur Naturforschung. Section A: Journal of Physical Sciences, 56, no. 12 (2001):832-836,
https://hdl.handle.net/21.15107/rcub_vinar_2498 .

TY  - JOUR
AU  - Zsigrai, Istvan J.
AU  - Gadžurić, Slobodan
AU  - Nikolic, RM
PY  - 2001
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2412
AB  - The complex formation between cadmium(II) ions and chloride and bromide ions in the melt of 0.8CH(3)CONH(2)-0.2Ca(NO3)(2). 4H(2)O has been studied at six temperatures between 30 and 80 degreesC. The formation constants of the complexes CdX+ and CdX2 (X=CI, Br) were determined from Emf measurements by means of Ag/AgX electrodes. The thermodynamic parameters DeltaH(mn)degrees and DeltaS(mn)degrees for the stepwise complex formation [GRAPHICS] have been estimated. The results are DeltaH(11)degrees = 4.2 kJ mol(-1). DeltaS(11)degrees = 52.4 J K-1 mol(-1), DeltaH(12)degrees = 3.3 kJ mol(-1) DeltaS(12)degrees = 40.7 J K-1 mol(-1) for the chloride complexes and DeltaH(11)degrees = -3.3 kJ mol(-1), DeltaS(11)degrees = 33.0 J K-1 mol(-1), DeltaH(12)degrees = -2.5 kJ mol(-1), DeltaS(12)degrees = 30.4 J K-1 mol(-1) for the bromide complexes. The parameters are compared with the literature data for the same process in dilute aqueous solutions and in some hydrated salt melts.
T2  - Magyar Kemiai Folyoirat
T1  - Thermodynamics of cadmium halide complex formation in acetamide-calcium nitrate tetrahydrate melt
VL  - 107
IS  - 1
SP  - 36
EP  - 42
UR  - https://hdl.handle.net/21.15107/rcub_vinar_2412
ER  - 

@article{
author = "Zsigrai, Istvan J. and Gadžurić, Slobodan and Nikolic, RM",
year = "2001",
abstract = "The complex formation between cadmium(II) ions and chloride and bromide ions in the melt of 0.8CH(3)CONH(2)-0.2Ca(NO3)(2). 4H(2)O has been studied at six temperatures between 30 and 80 degreesC. The formation constants of the complexes CdX+ and CdX2 (X=CI, Br) were determined from Emf measurements by means of Ag/AgX electrodes. The thermodynamic parameters DeltaH(mn)degrees and DeltaS(mn)degrees for the stepwise complex formation [GRAPHICS] have been estimated. The results are DeltaH(11)degrees = 4.2 kJ mol(-1). DeltaS(11)degrees = 52.4 J K-1 mol(-1), DeltaH(12)degrees = 3.3 kJ mol(-1) DeltaS(12)degrees = 40.7 J K-1 mol(-1) for the chloride complexes and DeltaH(11)degrees = -3.3 kJ mol(-1), DeltaS(11)degrees = 33.0 J K-1 mol(-1), DeltaH(12)degrees = -2.5 kJ mol(-1), DeltaS(12)degrees = 30.4 J K-1 mol(-1) for the bromide complexes. The parameters are compared with the literature data for the same process in dilute aqueous solutions and in some hydrated salt melts.",
journal = "Magyar Kemiai Folyoirat",
title = "Thermodynamics of cadmium halide complex formation in acetamide-calcium nitrate tetrahydrate melt",
volume = "107",
number = "1",
pages = "36-42",
url = "https://hdl.handle.net/21.15107/rcub_vinar_2412"
}

Zsigrai, I. J., Gadžurić, S.,& Nikolic, R.. (2001). Thermodynamics of cadmium halide complex formation in acetamide-calcium nitrate tetrahydrate melt. in Magyar Kemiai Folyoirat, 107(1), 36-42.
https://hdl.handle.net/21.15107/rcub_vinar_2412

Zsigrai IJ, Gadžurić S, Nikolic R. Thermodynamics of cadmium halide complex formation in acetamide-calcium nitrate tetrahydrate melt. in Magyar Kemiai Folyoirat. 2001;107(1):36-42.
https://hdl.handle.net/21.15107/rcub_vinar_2412 .

Zsigrai, Istvan J., Gadžurić, Slobodan, Nikolic, RM, "Thermodynamics of cadmium halide complex formation in acetamide-calcium nitrate tetrahydrate melt" in Magyar Kemiai Folyoirat, 107, no. 1 (2001):36-42,
https://hdl.handle.net/21.15107/rcub_vinar_2412 .

TY  - JOUR
AU  - Gadžurić, Slobodan
AU  - Zsigrai, Istvan J.
AU  - Nikolic, RM
PY  - 1999
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2297
AB  - The complex formation between cadmium(II) ions and chloride and bromide ions in the melt of 0.8CH(3)CONH(2)-0.2Ca(NO3)(2). 4H(2)O has been studied at six temperatures between 30 and 80 degrees C. The formation constants of the complexes CdX+ and CdX2 (X-Cl Br) were determined from emf measurements by means of Ag/AgX electrodes. The thermodynamic parameters Delta H(mn)degrees, and Delta S(mn)degrees, for the stepwise complex formation CdmXn-12m-n + X(-)reversible arrow CdmXn2m-n have been estimated. The results are Delta H(11)degrees = 4.2 kJ mol(-1), Delta S(11)degrees = 52.4 J K-1 mol(-1), Delta H(12)degrees = 3.3 kJ mol(-1), Delta S(12)degrees = 40.7 J K-1 mol(-1) for the chloride complexes and Delta H(11)degrees = -3.3 kJ mol(-1), Delta S(11)degrees -33.0 J K-1 mol(-1), Delta H(12)degrees = -2.5 kJ mol(-1), Delta S(12)degrees = 30.4 J K-1 mol(-1) for the bromide complexes. The parameters are compared with the literature data for the same process in dilute aqueous solutions and in some hydrated salt melts. (C) 1999 Elsevier Science B.V. All rights reserved.
T2  - Journal of Molecular Liquids
T1  - Thermodynamics of cadmium halide complex formation in acetamide - Calcium nitrate tetrahydrate melt
VL  - 83
IS  - 1-3
SP  - 75
EP  - 82
DO  - 10.1016/S0167-7322(99)00074-4
ER  - 

@article{
author = "Gadžurić, Slobodan and Zsigrai, Istvan J. and Nikolic, RM",
year = "1999",
abstract = "The complex formation between cadmium(II) ions and chloride and bromide ions in the melt of 0.8CH(3)CONH(2)-0.2Ca(NO3)(2). 4H(2)O has been studied at six temperatures between 30 and 80 degrees C. The formation constants of the complexes CdX+ and CdX2 (X-Cl Br) were determined from emf measurements by means of Ag/AgX electrodes. The thermodynamic parameters Delta H(mn)degrees, and Delta S(mn)degrees, for the stepwise complex formation CdmXn-12m-n + X(-)reversible arrow CdmXn2m-n have been estimated. The results are Delta H(11)degrees = 4.2 kJ mol(-1), Delta S(11)degrees = 52.4 J K-1 mol(-1), Delta H(12)degrees = 3.3 kJ mol(-1), Delta S(12)degrees = 40.7 J K-1 mol(-1) for the chloride complexes and Delta H(11)degrees = -3.3 kJ mol(-1), Delta S(11)degrees -33.0 J K-1 mol(-1), Delta H(12)degrees = -2.5 kJ mol(-1), Delta S(12)degrees = 30.4 J K-1 mol(-1) for the bromide complexes. The parameters are compared with the literature data for the same process in dilute aqueous solutions and in some hydrated salt melts. (C) 1999 Elsevier Science B.V. All rights reserved.",
journal = "Journal of Molecular Liquids",
title = "Thermodynamics of cadmium halide complex formation in acetamide - Calcium nitrate tetrahydrate melt",
volume = "83",
number = "1-3",
pages = "75-82",
doi = "10.1016/S0167-7322(99)00074-4"
}

Gadžurić, S., Zsigrai, I. J.,& Nikolic, R.. (1999). Thermodynamics of cadmium halide complex formation in acetamide - Calcium nitrate tetrahydrate melt. in Journal of Molecular Liquids, 83(1-3), 75-82.
https://doi.org/10.1016/S0167-7322(99)00074-4

Gadžurić S, Zsigrai IJ, Nikolic R. Thermodynamics of cadmium halide complex formation in acetamide - Calcium nitrate tetrahydrate melt. in Journal of Molecular Liquids. 1999;83(1-3):75-82.
doi:10.1016/S0167-7322(99)00074-4 .

Gadžurić, Slobodan, Zsigrai, Istvan J., Nikolic, RM, "Thermodynamics of cadmium halide complex formation in acetamide - Calcium nitrate tetrahydrate melt" in Journal of Molecular Liquids, 83, no. 1-3 (1999):75-82,
https://doi.org/10.1016/S0167-7322(99)00074-4 . .

TY  - JOUR
AU  - Marinković, Miloš
AU  - Nikolić, Ružica M.
AU  - Savović, Jelena
AU  - Gadžurić, Slobodan
AU  - Zsigrai, Istvan J.
PY  - 1998
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2119
AB  - The possibility to combine two physico-chemical phenomena is studied in this work in order to attain simultaneous control of temperature and light intensity in a greenhouse: (a) isothermal heat storage in phase change materials and (b) thermochromic behavior of complex compounds dissolved in the phase change materials. Two binary mixtures melting near the ambient temperature were studied: (a) 0.925 Ca(NO3)(2) . 4.06 H2O + 0.075 CaCl2 . 6.11 H2O melting at 35.6 degrees C and (b) 0.9 CH3CONH2 + 0.1 Ca(NO3)(2) . 4 H2O, melting at 27.7 degrees C. The melting temperature, the enthalpy of fusion and the heat capacity of both mixtures were determined from DSC measurements. Both mixtures showed to be suitable solvents for the formation of consecutive cobalt(II) chloride complexes. The compositions of the complex compounds were adjusted in each mixture so that the absorption spectra in visible spectral range exhibited low absorbance at the melting temperature and a pronounced increase of the absorbance and/or change of color with the increase of temperature in the range relevant for passive solar energy receivers. The combined latent heat storage and the outstanding reversible change of the optical properties of the dissolved complex compounds with temperature is proposed to be applied in solar heated agricultural greenhouses in areas with fluctuating climate conditions. The increase of absorbance with temperature acts as an auto-regulated shading protection from overheating. (C) 1998 Elsevier Science B.V. All rights reserved.
T2  - Solar Energy Materials and Solar Cells
T1  - Thermochromic complex compounds in phase change materials: Possible application in an agricultural greenhouse
VL  - 51
IS  - 3-4
SP  - 401
EP  - 411
DO  - 10.1016/S0927-0248(97)00259-6
ER  - 

@article{
author = "Marinković, Miloš and Nikolić, Ružica M. and Savović, Jelena and Gadžurić, Slobodan and Zsigrai, Istvan J.",
year = "1998",
abstract = "The possibility to combine two physico-chemical phenomena is studied in this work in order to attain simultaneous control of temperature and light intensity in a greenhouse: (a) isothermal heat storage in phase change materials and (b) thermochromic behavior of complex compounds dissolved in the phase change materials. Two binary mixtures melting near the ambient temperature were studied: (a) 0.925 Ca(NO3)(2) . 4.06 H2O + 0.075 CaCl2 . 6.11 H2O melting at 35.6 degrees C and (b) 0.9 CH3CONH2 + 0.1 Ca(NO3)(2) . 4 H2O, melting at 27.7 degrees C. The melting temperature, the enthalpy of fusion and the heat capacity of both mixtures were determined from DSC measurements. Both mixtures showed to be suitable solvents for the formation of consecutive cobalt(II) chloride complexes. The compositions of the complex compounds were adjusted in each mixture so that the absorption spectra in visible spectral range exhibited low absorbance at the melting temperature and a pronounced increase of the absorbance and/or change of color with the increase of temperature in the range relevant for passive solar energy receivers. The combined latent heat storage and the outstanding reversible change of the optical properties of the dissolved complex compounds with temperature is proposed to be applied in solar heated agricultural greenhouses in areas with fluctuating climate conditions. The increase of absorbance with temperature acts as an auto-regulated shading protection from overheating. (C) 1998 Elsevier Science B.V. All rights reserved.",
journal = "Solar Energy Materials and Solar Cells",
title = "Thermochromic complex compounds in phase change materials: Possible application in an agricultural greenhouse",
volume = "51",
number = "3-4",
pages = "401-411",
doi = "10.1016/S0927-0248(97)00259-6"
}

Marinković, M., Nikolić, R. M., Savović, J., Gadžurić, S.,& Zsigrai, I. J.. (1998). Thermochromic complex compounds in phase change materials: Possible application in an agricultural greenhouse. in Solar Energy Materials and Solar Cells, 51(3-4), 401-411.
https://doi.org/10.1016/S0927-0248(97)00259-6

Marinković M, Nikolić RM, Savović J, Gadžurić S, Zsigrai IJ. Thermochromic complex compounds in phase change materials: Possible application in an agricultural greenhouse. in Solar Energy Materials and Solar Cells. 1998;51(3-4):401-411.
doi:10.1016/S0927-0248(97)00259-6 .

Marinković, Miloš, Nikolić, Ružica M., Savović, Jelena, Gadžurić, Slobodan, Zsigrai, Istvan J., "Thermochromic complex compounds in phase change materials: Possible application in an agricultural greenhouse" in Solar Energy Materials and Solar Cells, 51, no. 3-4 (1998):401-411,
https://doi.org/10.1016/S0927-0248(97)00259-6 . .