Conductometric Study of Complex Formation Between Cu(II) Ion and 4-Amino-3-ethyl-1,2,4-triazol-5-thione in Binary Ethanol / Water Mixtures
The stability constant, Kf, for the complexation of copper(II) ion with 4-amino-3-ethyl-1,2,4-triazol-5-thione (AETT ) in 0, 20, 40, 60 and 80 (v/v) % ethanol-water mixtures were determined conductometrically at different tempratures. Stability constant of resulting 1:1 complexes were being larger b...
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2008-01-01
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Online Access: | http://dx.doi.org/10.1155/2008/364510 |
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doaj-ad18ebfad1ee4e629c07062da9864b412020-11-24T23:10:20ZengHindawi LimitedE-Journal of Chemistry0973-49452090-98102008-01-015355155610.1155/2008/364510Conductometric Study of Complex Formation Between Cu(II) Ion and 4-Amino-3-ethyl-1,2,4-triazol-5-thione in Binary Ethanol / Water MixturesMohammad Hakimi0Azizollah Nezhadali1Asghar Naemi2Department of Chemistry, Payame Noor University (PNU), Fariman, IranDepartment of Chemistry, Payame Noor University (PNU), Fariman, IranDepartment of Chemistry, Payame Noor University (PNU), Mashhad, IranThe stability constant, Kf, for the complexation of copper(II) ion with 4-amino-3-ethyl-1,2,4-triazol-5-thione (AETT ) in 0, 20, 40, 60 and 80 (v/v) % ethanol-water mixtures were determined conductometrically at different tempratures. Stability constant of resulting 1:1 complexes were being larger by increasing of temprature and ethanol percent. Stability constants of complexes vary inversly with dielectric constant of solvents. The enthalpy and entropy of complexation were determined from the temprature dependence of the formation constant. In all cases, the complexation were found to be enthalpy unstablized but entropy stablized. ࢞G0 of the studied complexes were evaluated at 25°C using thermodynamic relations, the negative values of ࢞G0 means that the complexation process is spantaneously.http://dx.doi.org/10.1155/2008/364510 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Mohammad Hakimi Azizollah Nezhadali Asghar Naemi |
spellingShingle |
Mohammad Hakimi Azizollah Nezhadali Asghar Naemi Conductometric Study of Complex Formation Between Cu(II) Ion and 4-Amino-3-ethyl-1,2,4-triazol-5-thione in Binary Ethanol / Water Mixtures E-Journal of Chemistry |
author_facet |
Mohammad Hakimi Azizollah Nezhadali Asghar Naemi |
author_sort |
Mohammad Hakimi |
title |
Conductometric Study of Complex Formation Between Cu(II) Ion and 4-Amino-3-ethyl-1,2,4-triazol-5-thione in Binary Ethanol / Water Mixtures |
title_short |
Conductometric Study of Complex Formation Between Cu(II) Ion and 4-Amino-3-ethyl-1,2,4-triazol-5-thione in Binary Ethanol / Water Mixtures |
title_full |
Conductometric Study of Complex Formation Between Cu(II) Ion and 4-Amino-3-ethyl-1,2,4-triazol-5-thione in Binary Ethanol / Water Mixtures |
title_fullStr |
Conductometric Study of Complex Formation Between Cu(II) Ion and 4-Amino-3-ethyl-1,2,4-triazol-5-thione in Binary Ethanol / Water Mixtures |
title_full_unstemmed |
Conductometric Study of Complex Formation Between Cu(II) Ion and 4-Amino-3-ethyl-1,2,4-triazol-5-thione in Binary Ethanol / Water Mixtures |
title_sort |
conductometric study of complex formation between cu(ii) ion and 4-amino-3-ethyl-1,2,4-triazol-5-thione in binary ethanol / water mixtures |
publisher |
Hindawi Limited |
series |
E-Journal of Chemistry |
issn |
0973-4945 2090-9810 |
publishDate |
2008-01-01 |
description |
The stability constant, Kf, for the complexation of copper(II) ion with 4-amino-3-ethyl-1,2,4-triazol-5-thione (AETT ) in 0, 20, 40, 60 and 80 (v/v) % ethanol-water mixtures were determined conductometrically at
different tempratures. Stability constant of resulting 1:1 complexes were being larger by increasing of temprature and ethanol percent. Stability constants of complexes vary inversly with dielectric constant of solvents. The enthalpy and entropy of complexation were determined from the temprature dependence of the formation constant. In all cases, the complexation were found to be enthalpy unstablized but entropy stablized. ࢞G0 of the studied complexes were evaluated at 25°C using thermodynamic relations, the negative values of ࢞G0 means that the complexation process is spantaneously. |
url |
http://dx.doi.org/10.1155/2008/364510 |
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