Thermodynamic Properties of Mixtures Containing Ionic Liquids. 1. Activity Coefficients at Infinite Dilution of Alkanes, Alkenes, and Alkylbenzenes in 4-Methyl-<i>n</i>-butylpyridinium Tetrafluoroborate Using Gas−Liquid Chromatography

Abstract

Activity coefficients at infinite dilution γ i ∞ of 19 alkanes, alkenes, and alkylbenzenes in the ionic liquid 4-methyl- n -butylpyridinium tetrafluoroborate (C 10 H 16 BF 4 N) were determined by gas chromatography using the ionic liquid as 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 dilution of the organic solutes in the ionic liquids have been derived.