Solute-solvent interactions of glycine, L-alanine, and L-valine in aqueous 1-methyl-3-octylimidazolium chloride ionic liquid solutions in the temperature interval (288.15-308.15) K

The density, rho, and speed of sound, u, of glycine, L-alanine and L-valine in aqueous 1-methyl-3-octylimidazolium chloride solutions have been measured in the temperature interval T = (288.15-308.15) K and atmospheric pressure. These data have been used to calculate apparent molar volume (V-phi), and apparent molar adiabatic compressibility (K-phi,K-s) of these mixtures at all the five temperatures. The standard partial molar volumes (V-phi(0)), standard partial molar volumes of transfer (Delta V-phi(0)), standard partial molar adiabatic compressibility (K-phi,s(0)), and standard partial molar adiabatic compressibility (Delta K-phi,s(0)) of transfer have been determined for these amino acid solutions from density and speed of sound data and discussed in terms of solute + solvent interactions. Later, the temperature dependence of the apparent molar volume was used to calculate apparent molar expansivity phi(0)(E) and the Hepler's constant values, (partial derivative V-2(phi)0/partial derivative T-2). (C) 2014 Elsevier B.V. All rights reserved.