Ionic liquids with asymmetric thioether-TFSI anions: Thermal properties and gas separation [* Cross-Reference *]

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Shevtsov, Vladislav Y.; Soares, Bruna F.; Nosov, Daniil R.; Marrucho, Isabel M.; Shaplov, Alexander S., 2026, "Ionic liquids with asymmetric thioether-TFSI anions: Thermal properties and gas separation [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.CFC5DQ, LIST Open Repository, V1
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Description
A straightforward and efficient thiol-ene Michael addition “click” chemistry route was developed to introduce asymmetry into the TFSI anion, enabling the synthesis of four ionic liquids (ILs) by coupling 1-ethyl-3-methylimidazolium (EMIM) cation with thioether-functionalized anions. This method offers high yields, excellent purities, mild reaction conditions, and versatile functionalization. The resulting ILs exhibit suppressed crystallization and vitrification behavior, with low glass transition temperatures (−75 to −62 °C), ensuring liquid-state stability over a wide temperature range. Compared to common ILs, such as EMIM TFSI, EMIM 2,2,2-(trifluoromethyl)sulfonyl-N-cyanoamide (TFSAM) and EMIM 2,2,2-trifluoro-N-(trifluoromethylsulfonyl)acetamide (TSAC), the synthesized ILs display higher viscosities, which reduce CO₂ diffusion and lower overall permeabilities (133–221 Barrer). Nevertheless, they demonstrate enhanced CO2/N2 selectivity (up to 41), with EMIM C₂H₅-S-TFSI combining the highest permeability (221 Barrer) with excellent selectivity. These findings highlight the potential of thioether-modified TFSI ILs for gas separation applications where selectivity is of primary importance. (2026-06-01)
***This entry has been automatically imported via Infodoc(ASO) CSV by LIST harvest scripts. Please refer to https://doi.org/10.1016/j.jil.2025.100186 for the original and latest version of the dataset and data downloads*** (2026-06-15)
Subject Physics
Keyword Gas separation, Ionic liquids, Membranes, Thioether-tfsi, Thiol-ene click
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