Thermodynamic properties of mixtures containing ionic liquids. Activity coefficients at infinite dilution of polar solutes in 4-methyl- N-butyl-pyridinium tetrafluoroborate using gas–liquid chromatography

Activity coefficients at infinite dilutionγi∞ of the linear and branched C 1to C 6alcohols, acetone, acetonitrile, ethylacetate, alkylethers, and chloromethanes in the ionic liquid 4-methyl- N -butyl-pyridinium tetrafluoroborate (C 10H 16BF 4N) were determined by gas chromatography using the ionic liquid as the stationary phase. The measurements were carried out at different temperatures between 313.1 K and 363.1 K. From the temperature dependence of the limiting activity coefficients partial molar excess enthalpies at infinite dilutionHiE, ∞ of these polar solutes in the ionic liquid have been derived.