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The development of novel task-specific ionic liquids (ILs) represents anessential challenge in modern organic and physical chemistries. Recently wereported surface-active ILs contained the two well-known organic cations(1-butyl-3-methylimidazolium and tetrabutylammonium) and the two surface-activeanions (lauryl sulfate, lauryl ether sulfate). In the present work, weinvestigate the affinity of these ionic compounds to the selected smallmolecules that exhibit practical implications: water, hydrogen fluoride,hydrogen sulfate, and carbon dioxide. We identified that the sulfate group, theether groups, and the aromatic imidazole ring make the strongest contributionsto the physical sorption of the polar gas molecules. In turn, thetetrabutylammonium cation, the saturated hydrocarbon chain of the anions, andthe alkyl chains of 1-butyl-3-methylimidazolium contribute to a significantlysmaller extent. The reported data are interesting in the context of usingsurface-active ILs in the oil industry to capture and store undesirable andtoxic gases.

The Affinity of the Sulfate- and Ether-Containing Surface-Active Ionic Liquids to Carbon Dioxide, Hydrogen Fluoride, Hydrogen Sulfide, and Water