Synthesis and characterization of Zn(II), Cu(II) and Ni(II) complexes with bidentate Schiff base ligands: Complexation studies and the determination of stability constant (Ke)

Abstract

The nickel(II), copper(II), and zinc(II) complexes with Schiff bases derived from 1-naphthylarnine and 2-hydroxy naphthaline-1-carbaldehyde (HL) or 1,4-diaminobutane and 4-methoxy benzaldehyde (L') have been prepared. The complexes have been characterized by elemental analysis, magnetic measurements, conductance measurements, H-1 NMR, UV, visible and IR-spectra. Analytical data and conductance spectral and magnetic studies provide evidence of the existence of mononuclear compounds corresponding to a stoichiometry of the M-II : L (1 : 2) type, Furthermore, the conductometric determination of the complexation constant, Ke, of AgNO3, ZnCl2, and Cu(NO3)(2) in 80% dioxane-water in the presence of HL and L' Schiff bases has been investigated. A small complexation constant value was found for the Cu(NO3)(2) with both HL and L' Schiff base ligands.