Conductometric and Spectrophotometric Studies of the Thermodynamics Complexation of Cu2+, Hg2+, Ni2+, Zn2+, Cd2+ and Co2+ Ions with (E)-(Pyridine -2-Ylmethylidene)({2-(E)-(Pyridine-2- Ylmethylidene)Amino]ethyl} Ligands in Acetonitrile Solution and Comparison of Their Behaviors

Document Type: Original research article

Authors

1 Department of Chemistry, Payame Noor University (PNU), P.O. BOX, 19395-3697, Tehran, Iran

2 Faculty of Chemistry, Tarbiat Modarres University, Tehran, Iran

Abstract

A new pyridine derivative ligand, (E)-(Pyridine-2-ylmethylidene)({2-(E)-(Pyridine-2-ylmethylidene)amino]ethyl}has been synthesized and kf value of its complexes with Cu2+, Ni2+, Cd2+, Zn2+, Hg2+ and Co2+has been determined by spectrophotometric and conductometric methods in acetonitrile at various temperatures. The formation constants (Kß = K1 × K2) of the 1:1 and 1:2 (metal ion to ligand) complexes were calculated by computer fitting of the absorbance-mole ratio data, and molar conductance-mole ratio data at different temperatures, and   found that complexes to vary in acetonitrile solvent in the order of Cu2+ >Hg2+>Zn2+>Co2+> Cd2+> Ni2+>Ag+. The enthalpy and entropy changes of the complexation reaction were evaluated from the temperature dependence of formation constants.

Keywords


 

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