Citation:
WANG Jun, YANG Xuzhao, WU Jinchao, SONG hao, ZOU Wenyuan. Determination of solubility parameters for asymmetrical dicationic ionic liquids by inverse gas chromatography[J]. Chinese Journal of Chromatography,
;2015, 33(12): 1301-1306.
doi:
10.3724/SP.J.1123.2015.07030
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Inverse gas chromatographic (IGC) technology was used to determine the solubility parameters of three asymmetrical dicationic ionic liquids ([PyC5Pi]NTf2]2, [MpC5Pi]NTf2]2 and [PyC6Pi]NTf2]2) at 343.15-363.15 K. Five alkanes were applied as test probes including octane (n-C8), decane (n-C10), dodecane (n-C12), tetradecane (n-C14), hexadecane (n-C16). Some thermodynamic parameters were obtained by IGC data analysis, such as the specific retention volumes of the solvents (Vg0), the molar enthalpies of sorption (ΔH1s), the partial molar enthalpies of mixing at infinite dilution (ΔHl∞), the molar enthalpies of vaporization (ΔHv), the activity coefficients at infinite dilution (Ω1∞), and Flory-Huggins interaction parameters (χ12∞) between ionic liquids and probes. The solubility parameters (δ2) of the three dicationic ionic liquids at room temperature (298.15 K) were 28.52-32.66 (J·cm-3)1/2. The solubility parameters (δ2) of cationic structure with 4-methyl morpholine are bigger than those of the cationic structure with pyridine. The bigger the solubility parameter (δ2) is, the more the carbon numbers of linking group of the ionic liquids are. The results are of great importance to the study of the solution behavior and the applications of ionic liquid.
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