Abstract

Experimental data have been collected from the published literature for the gas-to-ionic liquid partition coefficients and molar enthalpies of
solvation for over 60 solutes in the ionic liquids 1-hexyl-3-methylimidazolium tetracyanoborate ([MHIm]+
[B(CN)4]
–
), 1-(2-methoxyethyl)-
1-methylpiperidinium bis(trifluoromethylsulfonyl)imide ([MeoeMPip]+
[Tf2N]–
), and 1-(2-methoxyethyl)-1-methylpyrrolidinium
bis(trifluoromethylsulfonyl)imide ([MeoeMPyrr]+
[Tf2N]–
) over the temperature range 318.15 K to 368.15 K. The logarithm of the gas-toionic liquid partition coefficient, logKL, have been correlated to a temperature independent free energy relationship utilizing known
Abraham solvation parameters. The resulting mathematical expressions describe the experimental logKL values to within a standard
deviation of 0.077 log units or less and Hsolv to within a standard deviation of 1.344 kJ mol-1 or less.

Key words: partition coefficient, 1-hexyl-3-methylimidazolium tetracyanoborate, 1-(2-methoxyethyl)-1-methylpiperidinium bis(trifluoromethylsulfonyl)imide and 1-(2-methoxyethyl)-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, ionic liquids, temperature independence, linear free energy relationships, enthalpies of solvation