Study to explore assorted interfaces of an ionic liquid prevailing in solvent systems by physicochemical approach

Abstract

The electrolytic conductivities, densities, viscosities, refractive indices and FT-IR studies of 1-butyl-pyridinium bromide ([bupy]Br) have been studied in 1,4 dioxane, tetrahydrofuran, and acetonitrile at different temperatures. The molar conductivities observed were explained with the manifestation of the formation of ion-pairs and triple ion formation. The limiting ionic conductances have been estimated from the appropriate division of limiting the molar conductance of tetrabutylammonium tetraphenylborate as “reference electrolyte” method, along with a numerical evaluation of ion-pair and triple-ion formation constants (K_P ≈ K_A and K_T). Ion–solvent interactions have been interpreted in terms of apparent molar volumes, viscosity B-coefficients and molar refraction, which are obtained from the results supplemented with densities, viscosities and refractive index respectively. The FT-IR spectra of the solvents as well as the solutions have also been studied. The results have been discussed in terms of ion–dipole interactions, structural aspects and configurational theory.