Studies of solute–solvent interactions of imidazolium-based ionic liquid in water and aqueous l-alanine solution via volumetric and compressibility properties at T = (293.15–313.15) K

Abstract

The assessment of stability and behavior of ionic liquid is possible through the study of molecular interactions of the ionic liquid in water and mixed aqueous l-alanine solutions. We have studied density (ρ) and speed of sound (u) parameters at various temperatures. Derived parameters like apparent molar volume (Vϕ) and apparent molar isentropic compressibility (KS,ϕ) of solutes are calculated in the temperature range of 293.15 K–313.15 K. For aqueous binary and ternary solutions having ionic liquid [EMIm][MeSO4] and l-alanine as solute components. For ternary aqueous solutions concentration of l-alanine was kept constant (0.05 mol.kg−1). The limiting apparent molar volume (Vϕ0) and compressibility (KS,ϕ0) values for IL are estimated by using smooth extrapolation of Vϕ and KS,ϕ data. In both binary and ternary systems, the limiting apparent molar expansivity (Eϕ0) of solute and coefficient of thermal expansion (α*) and hydration number (nh) parameters have been calculated. The estimation of transfer parameters i.e., transfer volume and transfer compressibility results for transfer of IL from aqueous to aqueous l-alanine solutions are explained in terms of ion–solvent and hydrophobic interaction effects.