Abstract
In this study, physical and thermodynamic properties of 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMIM]PF6) were investigated by using inverse gas chromatography (IGC). Two groups of solvents with different chemical natures and polarities were used to obtain information about [HMIM]PF6-solvent interactions: chloroform, ethyl acetate, ether, acetone and alkanes. The specific retention volume (Vg0), molar heat of sorption, weight fraction activity coefficient, activity coefficients at infinite dilution, partial molar heat of mixing and Flory–Huggins interaction parameter between [HMIM]PF6 and solvents were determined in the temperature range of 343.15–373.15 K. Also, the solubility parameters of [HMIM]PF6 at infinite dilution were found by plotting the graph of δ12/(RT) – χ1.2∞/V1 versus solubility parameters, δ1, of probes. The results showed that n-C6, n-C7, n-C8, n-C9, ether, and n-butyl alcohol were poor solvents for [HMIM]PF6; chloroform, acetone, and ethyl acetate were favorite ones, while ethanol was moderate solvent for [HMIM]PF6 (close to poor solvent). The solubility parameter of [HMIM]PF6 was determined as 23.28 (J/cm3)0.5 by the extrapolation at 298.15 K.
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