Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Mixing ionic liquids (as well as mixing an inorganic salt in an ionic liquid) constitutes an easy, elegant methodology to obtain new ionic materials. In this study, three ionic liquids (ILs) sharing a common cation were synthesized and mixed in nine different proportions giving rise to twenty-seven binary mixtures. Specifically, 1-butyl-3-methylimidazolium nitrate, [C4C1Im][NO3], 1-butyl-3-methylimidazolium chloride, [C4C1Im]Cl, and 1-butyl-3methylimidazolium methanesulfonate, [C4C1Im][CH3SO3], were synthetized and characterized. They all share 1-butyl-3-methylimidazolium as the common, archetypal cation. None of them (or any of their binary mixtures) are liquid at the room temperature (T = 298.15 K) and two of them are only in the liquid state above temperatures of 343-353 K. Despite belonging to commonly used families of ILs, their handling and the study of their liquid properties (neat and mixtures) has become particularly difficult, mainly due to their tendency to solidify and their high viscosity (caused by hydrogen-bonded networks). The main goal of this work is to evaluate the thermal, dynamic, and volumetric properties of these compounds and their mixtures, as well as the solid-liquid equilibria of their binary mixtures. Thermal properties, such as melting and glass transition temperatures were determined or calculated. Therefore, both density and viscosity have been measured, which were used for the calculation of the isobaric thermal expansion coefficient, molar volumes, excess molar volumes and viscosity deviations to linearity.