Solvation properties of glycine and glycylglycine in aqueous 1-hexyl-3-methylimidazolium bromide solution at different temperatures

Abstract

Densities ρ, Speed of sound u and FTIR spectral studies for ternary mixture including ionic liquid 1-hexyl-3-methylimidazolium bromide, water and amino acids were measured over the entire composition range and at five temperatures from 288.15 K to 308.15 K and atmospheric pressure by means of vibrating tube densitometer DSA 5000. Different parameters have been calculated by utilizing the experimental data of density and speed of sound. The transfer parameter such as the partial molar volume of transfer (ΔVϕ0) and partial molar isentropic compression of transfer (ΔKϕ,S0) have been determined by using the limiting apparent molar volume (Vϕ0) and limiting apparent molar isentropic compression (Kϕ,s0) data respectively. The result has been used to discuss the nature and strength of intermolecular interactions in these mixtures. Apparent molar and partial molar parameters concerning volumetric calculate that the solute-solvent interactions are dominating in the ternary system. The pair and triplet interaction coefficients found from partial molar volumes of transfer and partial molar isentropic compression of transfer explain the dominance of pairwise interactions. FT-IR spectra have been noted down for the mixture of amino acids and ionic liquid (1-hexyl-3-methylimidazolium bromide). The aim of this work is to study the solute-solvent interactions prevailing in the ternary mixture.