Metal complexes of triazine - Schiff bases: Spectroscopic and thermodynamic studies of complexation of some divalent metal ions with 3-(α-acetylethylidenehydrazino)-5,6-diphenyl-1,2,4-triazine

Abstract

Metal complexes of some divalent metal ions (Co, Ni, Cu and Zn) with 3-(α- 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 50ºC) at an ionic strength of 0.1MKNO3 in 75%(v/v) dioxane-water solution. The standard thermodynamic parameters, viz. ΔGo, ΔHo, and ΔSo, for the proton-ligand and the stepwise metal-ligand complexes have been evaluated.

Keywords

• thermodynamic parameters
• schiff-base
• metal(ii)-complexes
• cobalt(ii)-complexes
• nickel(ii)-complexes
• copper(ii)-complexes
• zn(ii)-complexes
• formationconstant
• potentiometry and spectroscopy