Abstract
The complexation reactions between Ni 2+, Co 2+ and Zn 2+ metal ions with PAN in methanol (MeOH), acetonitrile (AN) and dimethyl sulfoxide (DMSO) were studied using a spectrophotometric method. The stability constants of the resulting complexes were determined from computer fitting absorbance mole-ratio data. The results revealed that the stability constants of complexes are varying in order of Ni 2+ < Zn 2+ < Co 2+ for all solvents. The values of the thermodynamic parameters (Δ H°, Δ S° and Δ G°) for complexation reactions were obtained from the temperature dependence of the stability constants.
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