Measurements of activity coefficients at infinite dilution of organic compounds and water in isoquinolinium-based ionic liquid [C8iQuin][NTf2] using GLC

New isoquinolinium ionic liquid has been synthesized from N  -octylisoquinolinium bromide as a substrate. The specific basic characterization of the new compound by NMR spectra, elementary analysis and water content is presented. The activity coefficients at infinite dilution, γ13∞ for 37 solutes viz. alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, alcohols, ethers, ketones, and water in the ionic liquid N-octylisoquinolinium bis{(trifluoromethyl)sulfonyl}imide [C8iQuin][NTf2], were determined by gas–liquid chromatography at the temperatures from (328.15 to 368.15) K. The partial molar excess enthalpies at infinite dilution values ΔH1E,∞ were calculated from the experimental γ13∞, obtained over the temperature range. The selectivity for the n-hexane/benzene, cyclohexane/benzene and n  -heptane/thiophene separation problems were calculated from the γ13∞ and compared to the other ionic liquids with bis{(trifluoromethyl)sulfonyl}imide anion, NMP and sulfolane, taken from the recent literature. The chosen ionic liquid demonstrates that it is possible to separate different organic compounds with the average selectivity and capacity.