Abstract
The activity coefficients at infinite dilution for 14 either polar or non-polar compounds have been determined in four room temperature dicationic ionic liquids, with the stationary phases loading between 10 and 20 %. The experiments were carried out at different temperatures between 308 and 323 K. Four new Ionic liquids (ILs), C9(methylmorpholine)2 (NTf2)2, C9(ethylmorpholine)2(NTf2)2, C12(methylmorpholine)2(NTf2)2, and C12(ethylmorpholine)2(NTf2)2 were investigated because of their higher viscosity and thermal stability in comparison with mono-cationic ILs. The obtained results showed that inverse gas chromatography is a useful method for examination of physiochemical properties of various materials. The partial molar excess enthalpies at infinite dilution, $$ H_{ 1}^{{{\text{E}},\infty }} $$ of the solutes were also derived from the temperature dependence of the γ i∞ values. The selectivity values ( $$ S_{ij}^{\infty } $$ ) which have been calculated in 323 K indicate that these ILs can be used as efficient solvents in aromatic–aliphatic separations.
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