Intermolecular interaction of organic solutes with protic [MIM][NO<inf>3</inf>] and aprotic [EMIM][NO<inf>3</inf>] ionic liquids

Abstract

© 2019 Elsevier B.V. Intermolecular interactions of organic solutes with a protic ionic liquid (1-methylimidazolium nitrate [MIM][NO3]) have been in focus of this work. Activity coefficients at infinite dilution of organic compounds in [MIM][NO3] were measured by gas-liquid chromatography at different temperatures between 303.15 and 343.15 K. Based on activity coefficients at infinite dilution of organic compounds in [MIM][NO3] the solution enthalpies were obtained. The solvophobic effect in protic ionic liquids was analyzed. It was shown the contribution of solvophobic effect on the solvation enthalpy in protic [MIM][NO3] is negligible. The hydrogen bond enthalpies of organic solutes in protic [MIM][NO3] and aprotic [EMIM][NO3] were calculated. The hydrogen bond enthalpies of organic solutes in the protic [MIM][NO3] and aprotic [EMIM][NO3] ionic liquids were compared. The hydrogen bond enthalpies of proton acceptor molecules in [MIM][NO3] and [EMIM][NO3] ionic liquids were analyzed.