Potentiometric and Thermodynamic Studies of Some Schiff-Base Derivatives of 4-Aminoantipyrine and Their Metal Complexes
The proton-ligand dissociation constant of 4-(4-amino-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino)-phenol () and 4-(4-amino-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino)-benzoic acid () and metal-ligand stability constants of their complexes with metal ions (Mn2+, Co2+, Ni2+...
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doaj-09d26fe5d9674b3fa04ef2a83e86de5e2020-11-24T22:43:33ZengHindawi LimitedJournal of Chemistry2090-90632090-90712013-01-01201310.1155/2013/682186682186Potentiometric and Thermodynamic Studies of Some Schiff-Base Derivatives of 4-Aminoantipyrine and Their Metal ComplexesA. A. El-Bindary0A. Z. El-Sonbati1M. A. Diab2M. K. Abd El-Kader3Department of Chemistry, Faculty of Science, Damietta University, Damietta 34517, EgyptDepartment of Chemistry, Faculty of Science, Damietta University, Damietta 34517, EgyptDepartment of Chemistry, Faculty of Science, Damietta University, Damietta 34517, EgyptDepartment of Chemistry, Faculty of Science, Damietta University, Damietta 34517, EgyptThe proton-ligand dissociation constant of 4-(4-amino-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino)-phenol () and 4-(4-amino-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino)-benzoic acid () and metal-ligand stability constants of their complexes with metal ions (Mn2+, Co2+, Ni2+, and Cu2+) have been determined potentiometrically in 0.1 mol·dm−3 KCl and 10% (by volume) ethanol-water mixture and at 298, 308, and 318 K. The stability constants of the formed complexes increase in the order Mn2+, Co2+, Ni2+, and Cu2+. The effect of temperature was studied, and the corresponding thermodynamic parameters (, , and ) were derived and discussed. The dissociation process is nonspontaneous, endothermic, and entropically unfavourable. The formation of the metal complexes has been found to be spontaneous, endothermic, and entropically favourable.http://dx.doi.org/10.1155/2013/682186 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
A. A. El-Bindary A. Z. El-Sonbati M. A. Diab M. K. Abd El-Kader |
spellingShingle |
A. A. El-Bindary A. Z. El-Sonbati M. A. Diab M. K. Abd El-Kader Potentiometric and Thermodynamic Studies of Some Schiff-Base Derivatives of 4-Aminoantipyrine and Their Metal Complexes Journal of Chemistry |
author_facet |
A. A. El-Bindary A. Z. El-Sonbati M. A. Diab M. K. Abd El-Kader |
author_sort |
A. A. El-Bindary |
title |
Potentiometric and Thermodynamic Studies of Some Schiff-Base Derivatives of 4-Aminoantipyrine and Their Metal Complexes |
title_short |
Potentiometric and Thermodynamic Studies of Some Schiff-Base Derivatives of 4-Aminoantipyrine and Their Metal Complexes |
title_full |
Potentiometric and Thermodynamic Studies of Some Schiff-Base Derivatives of 4-Aminoantipyrine and Their Metal Complexes |
title_fullStr |
Potentiometric and Thermodynamic Studies of Some Schiff-Base Derivatives of 4-Aminoantipyrine and Their Metal Complexes |
title_full_unstemmed |
Potentiometric and Thermodynamic Studies of Some Schiff-Base Derivatives of 4-Aminoantipyrine and Their Metal Complexes |
title_sort |
potentiometric and thermodynamic studies of some schiff-base derivatives of 4-aminoantipyrine and their metal complexes |
publisher |
Hindawi Limited |
series |
Journal of Chemistry |
issn |
2090-9063 2090-9071 |
publishDate |
2013-01-01 |
description |
The proton-ligand dissociation constant of 4-(4-amino-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino)-phenol () and 4-(4-amino-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino)-benzoic acid () and metal-ligand stability constants of their complexes with metal ions (Mn2+, Co2+, Ni2+, and Cu2+) have been determined potentiometrically in 0.1 mol·dm−3 KCl and 10% (by volume) ethanol-water mixture and at 298, 308, and 318 K. The stability constants of the formed complexes increase in the order Mn2+, Co2+, Ni2+, and Cu2+. The effect of temperature was studied, and the corresponding thermodynamic parameters (, , and ) were derived and discussed. The dissociation process is nonspontaneous, endothermic, and entropically unfavourable. The formation of the metal complexes has been found to be spontaneous, endothermic, and entropically favourable. |
url |
http://dx.doi.org/10.1155/2013/682186 |
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