CONDUCTIVITY AND VISCOSITY STUDIES OF DIMETHYL-SULFOXIDE (DMSO)-BASEDELECTROLYTE-SOLUTIONS AT 25-DEGREES-C

The specific conductivities and viscosities of lithium perchlorate at four different concentrations in dimethyl sulfoxide (DMSO)-based, bina ry mixed solvents are reported at 25-degrees-C. The co-solvents are te trahydrofuran (THF), 1,2-dimethoxyethane (DME) and 1,3-dioxolane (DOL) . The change in viscosity with solvent composition in all three mixed- solvent systems without electrolyte indicates the occurrence of struct ural disruption. The observed increase in viscosity with increase in L iClO4 concentration suggests an increasing compactness of the structur e. A 2 M LiClO4 solution shows maximum conductivity at 20 vol.% DMSO i n DMSO+DOL and at 40 vol.% DMSO in DMSO+THF mixtures. By contrast, a 1 .5 M LiClO4 solution has maximum conductivity at 40 vol.% DMSO in DMSO + DME mixtures. Preferential solvation of LiClO4 by DMSO occurs in th e respective mixtures with THF, DME and DOL.