Physico-chemical studies of some aminobenzoic acid hydrazide complexes | Zendy

Abd El | Zendy; Gamel El | Zendy

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Physico-chemical studies of some aminobenzoic acid hydrazide complexes

Author(s) -

Abd El,

Gamel El

Publication year - 2004

Publication title -

journal of the serbian chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.227

H-Index - 45

eISSN - 1820-7421

pISSN - 0352-5139

DOI - 10.2298/jsc0404255e

Subject(s) - chemistry , hydrazide , stoichiometry , endothermic process , titration , divalent , thermal stability , chemical stability , inorganic chemistry , conductometry , stability constants of complexes , proton nmr , carbon 13 nmr , crystallography , stereochemistry , organic chemistry , adsorption , aqueous solution

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, 1 H-NMR and 1 3 C-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 20-600 °C.

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