Abstract
Qualitative and quantitative analyses of molecular interaction prevailing in ionic liquid and organic solvent media, probed by electrical conductance have been reported. Conductometric studies of an ionic liquid {1-ethyl-3-methylimidazolium methanesulfonate [emim]CH3SO3} in n-propanol, n-butanol, and n-pentanol at 298.15 K reveal high molecular interaction contributed mainly by ion–dipole interaction. Association constants (KA), limiting molar conductance (Λ0), and the distance of closest approach of ions (R) for ion-pair formation have been analyzed using Fuoss conductance equation (1978). The molar conductivities observed were explained by the formation of ion-pairs (M++X¯→MX). The Walden product is obtained and discussed. Molar refraction (RM) has been calculated using the Lorentz–Lorenz equation. The results show more association of the ions in n-pentanol than in n-propanol and results have been interpreted in terms of ion–solvent and solvent–solvent interaction. The extent of interaction has also been expressed in terms of the association constant (KA) and shows the ion–dipole interaction to be a function of viscosity.
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