Formation constants and thermodynamic studies of copper complex with N1-(2- hydroxybenzylidene) terephthalohydrazide

Abstract

N1-(2-hydroxybenzylidene) terephthalohydrazide (HL), a Schiff base, was synthesized and characterized using several analytical techniques. Potentiometric analysis of the complexation of Schiff base N1-(2-hydroxy benzylidene) terephthalohydrazide (HL) with copper (II) was conducted at various temperatures (298–328 K) in an acidic medium (0.1 M HCl). The complexation of copper (II) with N1-(2-hydroxy benzylidene) terephthalohydrazide in 0.1 M HCl was potentiometrically studied using Bjerrum method. The compositions of complexes were determined, and their stepwise formation constants were determined. The compositions of complexes were determined, and their stepwise formation constants were calculated. The complexes were shown to become less stable as the temperature increased. The thermodynamic functions of complexation were estimated.