Abstract

Olaitan Esan, Christopher Segun and Olumuyiwa Aboluwoye

The complex-formation reactions between Cu 2+ , Zn 2+ , Co 2+ , Ni 2+ and Cd 2+ ions with 2-((E)-(2-(2-(pyridine-2- yl)-ethylthio)ethylimino)methyl)-4-bromophenol(PYTABr) has been studied by spectrophotometric and conductometric methods in acetonitrile at various temperatures. Formation constants of the 1:1 and 1:2 (metal ion to ligand) complexes were evaluated from computer fitting of the absorbance-mole ratio data, and molar conductance-mole ratio data at different temperatures, and found that complexes to vary in the order of Ni 2+ >Co 2+ >Cu 2+ >Zn 2+ >Cd 2+ . The enthalpy and entropy changes of the complexation reaction were determined from the temperature dependence of the formation constants.