Infra-red and U.V. visible spectra studies were carried out on copper (II) complexes of 2-methoxy phenylhydrazoacetylacetone (2-MeOPHA), 2-chlorophenylhydrazoacetylacetone (2-C1-PHA), 2-Bromophenylhydrazoacetyl-acetone (2-BR PHA), and 4-fluorophenylhydrazoacetylacetone (4-FPHA) organic ligands. The composition of complexes was found to be 1:2 (metal to ligand) stoichiometry and the structure of complexes was proposed to be square planar. The proton-ligand dissociation constant (pK) and the stability constants (log K1 and log K2) of their copper complexes have been determined pH-metrically at 30oC and at ionic strength 0.1 in 75% dioxane-water medium. The stability constants was found to be in the following order.
B A SHETARY ,M S ABDEL-MOEZ ,
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