Transport properties of copper(I) perchlorates in mixed solvents. Part 1.—Transference numbers of copper(I) perchlorate in acetonitrile–N,N-dimethylacetamide mixtures at 25 °C

Abstract

Transference numbers of Cu+ and ClO–4 ions in copper(I) perchlorate (CuClO4) have been measured in acetonitrile–N,N-dimethylacetamide mixtures containing 90, 80, 70, 60, 50 and 40 mol% acetonitrile at 25 °C. The limiting transference numbers of Cu+(t0Cu+) in various solvent mixtures have been evaluated using the modified Longsworth method. λ0Cu+ and λClO4–0 values have been calculated by combining limiting transference numbers of the Cu+ cation with the Λ0 values of CuClO4, and the solvated radii for Cu+ and ClO–4 ions have been evaluated. Comparison of the solvated radii for the Cu+ and ClO–4 ions in acetonitrile–N,N-dimethylacetamide (AN–DMA) and acetonitrile–N,N-dimethylformamide (AN–DMF) mixtures shows an identical solvation behaviour of the ClO–4 ion in these two solvent systems, but relatively more solvation of the Cu+ cation in AN–DMF mixtures.