Study on physicochemical and excess properties of [HEMIM][Ala] with DMSO/H2O binary mixtures

Hydroxyl-functionalized ionic liquids 1-(2-hydroxyethyl)-3-methylimidazolium alanine was synthesized and characterized by 1H NMR and 13C NMR spectrum. And it was mixed with DMSO and water respectively by weight method over the entire concentration. The density, viscosity, surface tension and refractive indices of the binary mixture were measured in the temperature range from 288.15 K to 333.15 K. Then volume properties and excess data were calculated and fitted. According to Redlich-Kister equation, the relationship between excess molar volume, viscosity deviation and the molar fraction of solute were fitted. Using the excess properties, the influence of the interaction between IL and solvents (DMSO/water) were analyzed. By comparing with the systems of the different ILs in the same solvents, the above-mentioned properties were discussed.