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

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 ( V ϕ ) and apparent molar isentropic compressibility ( K S , 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 ( V ϕ 0 ) and compressibility ( K S , ϕ 0 ) values for IL are estimated by using smooth extrapolation of V ϕ and K S , ϕ data. In both binary and ternary systems, the limiting apparent molar expansivity ( E ϕ 0 ) 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.