Interionic interactions of glycine, l-alanine, glycylglycine and phenylalanine in aqueous 1-hexyl-3-methylimidazolium chloride ionic liquid solutions at T = (288.15 to 308.15) K: Volumetric, speed of sound and viscometric measurements.

Apparent molar volumes and apparent molar isentropic compression have been determined for glycine, l -alanine, glycylglycine and phenylalanine in (0.01 and 0.03) mol kg − 1 in aqueous solutions of 1-hexyl-3-methylimidazolium chloride ([C 6 mim][Cl]) solutions by measurements of densities and speeds of sound at different temperatures. Apparent molar volumes V ϕ , partial molar volumes V ϕ 0 , transfer volumes Δ V ϕ 0 and hydration number, n H are evaluated using density data. Apparent molar isentropic compression K ϕ , s , partial molar isentropic compression K ϕ , S 0 , transfer isentropic compression Δ K ϕ , S 0 , and hydration number, n H have been calculated using speeds of sound data. The viscosity data have been analyzed by means of the Jones–Dole equation to obtain A and B -coefficients, free energy of activation of viscous flow per mole of solvent, Δ μ 1 0 ∗ , and solute, Δ μ 2 0 ∗ , enthalpy, Δ H 0 ∗ , and entropy of activation, Δ S 0 ∗ of viscous flow were evaluated. The behavior of these parameters has been interpreted in terms of solute–solute and solute–solvent interactions. [ABSTRACT FROM AUTHOR]