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Physico-chemical studies of some aminobenzoic acid hydrazide complexes
Faculty
Science
Year:
2004
Type of Publication:
Article
Pages:
255-264
Authors:
Abd El Wanees, S, El Gamel, M, Abd el Wahed, MG, Abd El Haleem, S
Journal:
JOURNAL OF THE SERBIAN CHEMICAL SOCIETY SERBIAN CHEMICAL SOC
Volume:
69
Research Area:
Chemistry
ISSN
ISI:000220932200003
Keywords :
potentiometry, conductometry, stability constants, thermodynamic parameters, structure and thermal stability of complexes
Abstract:
The stability constants and related thermodynamic functions characterizing the formation of divalent Ni, Cu, Zn, Cd and Hg complexes with o- and p-aminobenzoic acid hydrazide were determined potentiometrically at different temperatures. The formations of the complexes are endothermic processes. The formed bonds are mainly electrostatic. Conductometric titration was carried out to determine the stoichiometry and stability of the formed complexes. The structures of complexes were characterized by their IR. H-1-NMR and C-13-NMR spectra, as well as X-ray diffractograms. The coordination process takes place through the carbonyl group and the terminal hydrazinic amino group. The thermal stability of the complexes was followed in the temperature range 20-600degreesC.
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