Measurements of activity coefficients at infinite dilution using GLC. 64 organic solvents in the ionic liquid 1-ethyl-3-methylimidazolium tricyanomethanide. High selectivity for three separation problems such as hexane/hex-1-ene, cyclohexane/cyclohexene and ethylbenzene/styrene. The excess thermodynamic functions and the gas-liquid partition coefficients were presented. The Abraham solvation parameter model.