Abstract
The thermodynamic and physicochemical properties of 1-octyl-3-methylimidazolium hexafluorophosphate ([OMIM]PF6) were investigated by inverse gas chromatography from 343.15K to 373.15K. Two groups of solvents with different chemical natures and polarities were used to characterize [OMIM]PF6–solvent interactions. The specific retention volume, molar heat of sorption, weight fraction activity coefficient, partial molar heat of mixing, Flory–Huggins interaction parameter between [OMIM]PF6 and the tested solvents, as well as activity coefficients at infinite dilution were determined. The solubility parameters of [OMIM]PF6 were also determined by plotting the graph of δ12/(RT)−χ12∞/V1 versus the solubility parameter δ1 of the probes.
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