Solvation Behaviour of Some Copper(I) Complexes in Binary Mixtures of Dimethylsulfoxide with Dimethylacetamide and Dimethylformamide at 298 K

Abstract

Molar conductance values of a large number of copper(I) perchlorate complexes behaving as strong 1:1 electrolytes, have been measured in binary mixtures of dimethylsulfoxide with dimethylacetamide and dimethylformamide at 298 K. The measured conductance data have been analyzed to obtain the limiting molar conductance (Λo) of these electrolytes. The limiting ion conductances (λ±°) for various ions in the binary mixtures of DMSO with DMA and DMF have been calculated by an indirect method using [Bu4N]BPh4 as a reference electrolyte. The actual ionic radii (ri) values for these copper(I) complex ions increase significantly with increase in DMA composition whereas the corresponding ri values for these ions do not show a significant increase with increase in DMF composition that indicates no preferential solvation of copper(I) complex ions for DMF over DMSO, thus showing that DMA solvates the copper(I) complex ions more strongly than DMF.