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The Association of Water in Ionic Liquids: A Reliable Measure of Polarity


  • This research was supported by the State of Mecklenburg-Western Pomerania (Hochschulwissenschaftsprogramm) and the German Science Foundation (DFG, FOR 436).


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Water molecules can be used as a sensitive probe for measuring the polarity of ionic liquids (ILs). A combination of FTIR spectroscopy and DFT calculations was used to determine the molecular state of water in ILs. The picture shows a possible configuration of H2O in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (red O, white H, blue N, black C, yellow S, shaded yellow F).