ION SOLVATION OF SOME COPPER(II) SALTS IN WATER PLUS N-METHYL-2-PYRROLIDINONE SOLVENT MIXTURES AT 30-DEGREES-C

The preferential solvation of copper(II) iodate, benzoate, formate, sa licylate, p-methylbenzoate, and p-nitrobenzoate has been studied in wa ter+N-methyl-2-pyrrolidinone mixtures at 30 degrees C by Gibbs energie s of transfer and solvent transport number measurements. The Gibbs tra nsfer energies of the salts were split into their ionic values using t he transfer energies of copper ion determined on the basis of the negl igible liquid junction potential method. These results were also compa red with those obtained on the basis of the tetraphenylarsonium tetrap henylborate method. These results have been interpreted in terms of he teroselective solvation of all the salts with the copper ion being sel ectively solvated by N-methyl-2-pyrrolidinone and anions by water.