%0 Journal Article
%T Metal complexes of triazine - Schiff bases: Spectroscopic and thermodynamic studies of complexation of some divalent metal ions with 3-(a-acetylethylidenehydrazino)-5,6-diphenyl-1,2,4-triazine
%A M. MASHALY
%A H. A. BAYOUMI
%A A. TAHA
%J Journal of the Serbian Chemical Society
%D 1999
%I Serbian Chemical Society
%X Metal complexes of some divalent metal ions (Co, Ni, Cu and Zn) with 3-(a-acetylethylidenehydrazino)-5,6-diphenyl-1,2,4-triazine (AHDT) as a Schiff-base have been investigated potentiometrically and spectrophotometrically and found to have the stoichiometric formulae 1:1 and 1:2 (M:L). The formation constants of the proton-ligand and metal-ligand complexes have been determined potentiometrically at different temperatures (10, 20, 30, 40 and 50¡ãC) at an ionic strength of 0.1 M KNO3 in 75% (v/v) dioxane-water solution. The standard thermodynamic parameters, viz. DG¡ã, DH¡ã, and DS¡ã, for the proton-ligand and the stepwise metal-ligand complexes have been evaluated.
%K thermodynamic parameters
%K Schiff-base
%K metal(II)-complexes
%K cobalt(II)-complexes
%K nickel(II)-complexes
%K copper(II)-complexes
%K Zn(II)-complexes
%K formation constant
%K potentiometry and spectroscopy
%U http://www.shd.org.yu/HtDocs/SHD/Vol64/No10-Pdf/V64-no10-07.zip