This paper presents new data on activity coefficients at infinite dilution, gamma(infinity) for 62 different solutes: alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, alcohols, thiophene, ethers, ketones, and water in the ionic liquid 4-(2-methoxyethyl)-4-methylmorpholinium trifluorotris(perfluoroethyl) phosphate, [COC(2)mMOR][FAP]. The data were determined by inverse gas chromatography at six temperatures from T = 318.15 K to T = 368.15 K. These values were compared with ionic liquid based on the same cation and bis(trifluoromethylsulfonyl)-amide anion, [COC(2)mMOR][NTf2]. Additionally the partial molar excess Gibbs free energies Delta G(I)(E,infinity) enthalpies Delta H-I(E,infinity) , and entropies Delta S-I(E,infinity) 1 at infinite dilution were calculated from the experimental gamma(infinity) values obtained over the temperatures range. The selectivities and capacities at infinite dilution for hexane/benzene, cyclohexane/benzene, and heptane/thiophene extraction problems were calculated from the gamma(infinity) to verify the possibility of investigated ionic liquid as an entrainer in liquid-liquid extraction and desulphurization of fuels. Obtained values were compared with literature data of other ionic liquids based on trifluorotris(perfluoroethyl) phosphate and bis( trifluoromethylsulfonyl)-amide anions and industrial solvents: NMP and sulfolane. Also the Abraham solvation parameter model was used for evaluation of the solvation characteristic of the ionic liquid. Linear free energy relationship (LFER) system constants as a function of temperature were calculated. (C) 2012 Elsevier Ltd. All rights reserved.