Activity coefficients at infinite dilution gamma(infinity)(i) of methanol, 1-butanol, and 1-hexanol in the ionic liquid 1-hexyl-3-methyl-imidazolium bis(trifluoromethyl-sulfonyl) imide ([HMIM][NTf2]) have been determined by gas chromatography using the ionic liquids as stationary phase. The measurements were carried out at different temperatures between 298 K and 396 K. From the temperature dependence of the limiting activity coefficients partial molar excess enthalpies at infinite dilution H-i(E.infinity) of the alcohol in the ionic liquid have been derived. Additionally, enthalpies of solution of the same alcohols in the [HMIM][NTf2,] have been measured at T = 298.15 K in the range of low concentrations using titration calorimetry. Results at infinite dilution, H-i(E.infinity), are compared with those indirectly obtained from activity coefficients in infinite dilution gamma(infinity)(i). Within the experimental error of both methods thermodynamic consistency has been confirmed. (c) 2006 Elsevier Ltd. All rights reserved.