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 H i E,∞ of the organic solutes in the ionic liquids have been derived.

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The standard molar enthalpies of vaporization ∆ l g H°m of the 14 branched C 5 and C 6 alkanols 2,2dimethyl-1-propanol, 2-methyl-1-pentanol, 3-methyl-1-pentanol, 2-ethyl-1-butanol, 3,3-dimethyl-1-butanol, 2-hexanol, 3-hexanol, 3-methyl-2-pentanol, 4-methyl-2-pentanol, 2-methyl-3-pentanol, 3,3-dimethyl-2butanol, 2-methyl-2-butanol, 3-methyl-3-pentanol, and 2,3-dimethyl-2-butanol have been determined. The data were obtained from the temperature dependence of the vapor pressure measured by the transpiration method. A linear correlation of enthalpies of vaporization of the secondary alcohols with the number of C atoms has been found. The effect of self-association of aliphatic alcohols in the liquid phase is discussed in terms of the difference of ∆ l g H°m(298.15 K) between associating alcohols and their nonassociating alkane homomorphs.

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