Determination of solubility parameters for asymmetrical dicationic ionic liquids by inverse gas chromatography

doi:10.3724/SP.J.1123.2015.07030

Abstract

Abstract:

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 (V_g⁰), the molar enthalpies of sorption (ΔH₁^s), the partial molar enthalpies of mixing at infinite dilution (ΔH_l^∞), the molar enthalpies of vaporization (ΔH_v), 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.

Key words: activity coefficients at infinite dilution, dicationic ionic liquids, inverse gas chromatography (IGC), solubility parameters

CLC Number:

O658

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.

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