Effect of 1-Ethyl-3-methylimidazolium Bromide Ionic Liquid on the Volumetric Behavior of Some Aqueous <scp>l</scp>-Amino Acids Solutions

Abstract

Densities of aqueous solutions of glycine, l-alanine, l-arginine, and l-phenylalanine containing 1-ethyl-3-methylimidazolium bromide, [EMIm]Br, have been determined at T = (298.15 and 308.15) K. From the experimental density data, the apparent molar volumes (VΦ) and the standard partial molar volumes (VΦ0) at (298.15 and 308.15) K have been calculated. The values of standard partial molar volumes of transfer (ΔtrVΦ0) are also obtained and are negative for glycine, l-alanine, and l-phenylalanine while positive for l-arginine. The ΔtrVΦ0 values all increased with the increase of the temperature and also the [EMIm]Br content. The obtained volumetric parameters will be helpful to understand mixing effects and other complex biological processes between head and side chain groups of amino acids and ionic liquid [EMIm]Br in aqueous solution.