Abstract
Abstract Complexation reactions between murexide and Co2+, Ni2+, Cu2+, Zn2+, Cd2+ and Pb2+ ions have been studied in different acetonitrile-dimethylsulfoxide mixtures at various temperatures by a spectrophotometric technique. Formation constants of 1:1 and 2:1 (murexide to metal ion) complexes were determined from the absorbance-mole ratio data and found to vary in the order Cu2+ > Cd2+ > Ni2+ Co2+ > Zn2+ > Pb2+. A linear relationship is observed between log β2 for different complexes and the mole fraction of acetonitrile in the solvent mixture. Enthalpy and entropy data for complexation were determined from the temperature dependence of stability constants. From the thermodynamic data obtained, the TΔS∗ - ΔH∗ plot shows a fairly good linear correlation and indicates enthalpy-entropy compensation in the reactions.
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