GIBBS TRANSFER ENERGIES AND SOLVENT TRANSPORT NUMBERS OF SOME COPPER(II) SALTS IN METHANOL-DIMETHYLFORMAMIDE MIXTURES

Standard Gibbs energies of transfer have been determined for copper(II) iodate, benzoate and formate at 30 degrees C in methanol-dimethylformamide mixtures by solubility measurements. Single-ion transfer energies were obtained by using the negligible liquid junction potential assumption, along with relevant literature data, and are in excellent agreement with values estimated from the reference electrolyte (tatb) assumption. The results obtained indicate that all of these salts are heteroselectively solvated in these mixtures, with CU2+ being preferentially solvated by dmf and the anions by MeOH. This model is consistent with calculations based on the quasi-lattice quasi-chemical theory of Marcus and with solvent transport numbers obtained from e.m.f. measurements.