Activity coefficients at infinite dilution for organic solutes dissolved in two 1,2,3-tris(diethylamino)cyclopenylium based room temperature ionic liquids

Infinite dilution activity coefficients and gas-to-liquid partition coefficients have been determined for at least 45 different organic solutes of varying polarity and hydrogen-bonding character dissolved in anhydrous 1,2,3-tris(diethylamino)cyclopropenylium dicyanamide, ([TDC]+[DCA]−), and 1,2,3-tris(diethylamino)cyclopropenylium bis(trifluoromethylsulfonyl)imide, ([TDC]+[Tf2N]−). The measured infinite dilution activity coefficients were used to calculation selectivity values for various practical separation problems. Computations showed ([TDC]+[DCA]−) should afford better performance in hexane/benzene and hexane/pyridine separation problems than sulfolane and N-methyl-2-pyrrolidone. Abraham model correlations were derived for predicting solute transfer into both ([TDC]+[DCA]−) and ([TDC]+[Tf2N]−) from water and from the gas phase. The derived correlations describe the observed solute transfer partition coefficients to within 0.13 (or fewer) log units.