The activity coefficients at infinite dilution, gamma(infinity)(13), for 53 different solutes including alkanes, cycloalkanes, alkenes, alkynes, aromatic hydrocarbons, alcohols, ethers, ketones, thiophene, acetonitrile, pyridine, 1-nitropropane and water in the ionic liquid N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethylsulfonyl)imide, [COC2N1,2,2][NTf2] were determined using inverse gas-liquid chromatography. The experiment has been performed at five temperatures over the range of (318.15 to 358.15) K. From experimental results, the partial molar excess Gibbs energy, Delta G(1)(E,infinity), enthalpy Delta H-1(E,infinity) and entropy term T-ref Delta S-1(E,infinity) at infinite dilution were calculated. Additionally, the gas-liquid partition coefficients of the solutes, K-L were calculated. The value of selectivity, S-12(infinity) and capacity, k(2)(infinity) at infinite dilution for hexane/benzene, cyclohexane/benzene, heptane/thiophene and heptane/pyridine separation processes were calculated directly from gamma(infinity)(13). These parameters are compared to literature values of S-12(infinity) and k(2)(infinity) for other ionic liquids and NMP, or sulfolane - solvents commercially used on an industrial scale in separation processes. Moreover, physicochemical properties of pure ILs that is: density, viscosity and surface tension have been determined as a function of temperature and basic thermal properties of pure [COC2N1,2,2][NTf2] were measured using DSC technique. (C) 2016 Elsevier Ltd.