Exploring the Molecular Interactions of 1,3-Dimethylimidazolium Methyl Sulfate Ionic Liquid in Aqueous and Aqueous l-Alanine Solutions at Various Temperatures

Abstract

The present study employed volumetric and compressibility methods to investigate the intermolecular interactions of 1,3-dimethylimidazolium methyl sulfate, i.e., [MMIm]-[MeSO 4 ] ionic liquid in both aqueous and aqueous L-alanine solutions. Density (ρ) and sound velocity (c) for [MMIm]-[MeSO 4 ] in two different systems such as the binary system ([MMIm][MeSO 4 ] in water) and the ternary system ([MMIm]-[MeSO 4 ] in 0.05 mol kg −1 aqueous L-alanine solution) were measured within a temperature range of 288.15−318.15 K at intervals of 5 K over the concentration range of 0.03−0.15 mol kg −1 . We calculated various parameters such as the apparent molar volume of solute (V ϕ ), the limiting apparent molar volume of solute (V ϕ ο ), the experimental slope (S v ), the isobaric thermal expansion coefficient (α), the transfer limiting apparent molar volume of solute (Δ tr V ϕ 0 ), the isentropic compression of solution(κ S ), the apparent molar isentropic compression of solute (K S,ϕ ), the partial molar isentropic compression of solute (K S,ϕ 0 ), the transfer partial molar isentropic compression of solute (Δ tr K S,φ 0 ), and Hepler's constant (∂ 2 V ϕ 0 /∂T 2 ) by using the experimental ρ and c data. The outcomes are elucidated in terms of interactions between the solute−solute and solute−solvent in the studied systems.