Solution behaviour of 1-ethyl-3-methyl imidazolium tosylate (IL) and some industrially important solvents (dimethylformamide, tetrahydrofuran and 1,4-dioxane) have been studied by electrolytic conductivity, density (ρ) and viscosity study. The limiting molar conductivities (Λ₀), association constants (K_A), and the distance of closest approach (R) of the ions have been measured using the Fuoss and Fuoss-Krass theory. The observed molar conductivities were explained by the formation of ion pairs and triple ions. Ion–solvent interactions have been interpreted in terms of apparent molar volumes and viscosity B-coefficients. Tetrabutylammonium tetraphenylborate [Bu₄NBPh₄] was measured as reference electrolyte to estimate the limiting ionic conductivity (λ₀^±) of the ions along with the numerical appraisal of ion-pair formation constant.
Keywords: Ionic Liquid; Dimethylformamide; Tetrahydrofuran; 1,4-Dioxane;