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)Aminoethyl} Ligands in Acetonitrile Solution and Comparison of Their Behaviors

摘要

A new pyridine derivative ligand, (E)-(Pyridine-2-ylmethylidene)({2-(E)-(Pyridine-2-ylmethylidene)aminoethyl}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.