Investigations of (solute-solute) and (solute-solvent) interactions in ternary {amino acids+1-dodecyl-3-methylimidazolium bromide [C12mim] [br] + water} mixtures at different temperatures

Density and speed of sound of an aqueous solution of glycine and L-valine containing 1-dodecyl-3-methylimidazolium bromide, [C(12)mim] [Br], have been determined at T= (288.15 K to 308.15 K). From experimental density, the apparent molar volumes (V-phi), the apparent molar volumes at infinite dilution (V-phi(0)) and partial molar volume of transfer Delta V-phi(0) have been calculated. The values of apparent molar volumes (V-phi) are positive for both glycine and L-valine and increase with the increase in temperature and concentration of 1-dodecyl-3-methylimidazolium bromide. On the other hand speed of sound data have been used to determine partial molar isentropic compression (K-phi,K-s), partial molar isentropic compression at infinite dilution (K-phi,s(0)) and partial molar isentropic compression of transfer Delta K-phi,s(0). The obtained volumetric and acoustic parameters will be helpful to understand mixing effects, structural changes and other complex biological processes between head and side-chain groups of glycine or L-valine and ionic liquid [C(12)mim] [Br] in aqueous medium. (C) 2020 Elsevier Ltd.

Automated summary

The density and speed of sound of an aqueous solution of glycine and L-valine containing 1-dodecyl-3-methylimidazolium bromide were studied, and the apparent molar volumes and partial molar volume were calculated. The apparent molar volumes for both amino acids showed positive values that increased with temperature and concentration of the bromide compound.