Correlation of the Solubilizing Abilities of Hexyl(trimethyl)ammonium bis((Trifluoromethyl)sulfonyl)imide, 1-Propyl-1-methylpiperidinium bis((Trifluoromethyl)sulfonyl)imide, and 1-Butyl-1-methyl-pyrrolidinium Thiocyanate

Chromatographic retention data were measured for a wide range of organic solutes on 1-butyl-1-methylpyrrolidinium thiocyanate ([BMPyrr](+)[SCN](-)), hexyl(trimethyl)ammonium bis((trifluoromethyl)sulfonyl)imide ([HexM(3)Am](+)[(Tf)(2)N](-)), and 1-propyl-1-methylpiperidinium bis((trifluoromethyl)sulfonyl)imide ([PMPip](+)[(Tf)(2)N](-)) stationary phases at 323 and 353 K. The measured retention factors were combined with published infinite dilution activity coefficient and gas-to-water partition coefficient data to yield gas-to-anhydrous ionic liquid (IL) partition coefficients and water-to-anhydrous IL partition coefficients. Both sets of partition coefficients were analyzed using the Abraham model. The derived Abraham model correlations describe the observed gas-to-IL and water-to-IL partition coefficient data to within average standard deviations of 0.116 and 0.156 log(10) units, respectively.