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Alexander Wulf, Thorsten Köddermann, Christiane Wertz, Andreas Heintz, Ralf Ludwig
Water Vibrational Bands as a Polarity Indicator in Ionic Liquids
Keywords: Ionic Liquids, Polarity, Infrared spectroscopy, Ab Initio Calculations
With a combination of FTIR and ab initio calculations we studied the structure of water molecules confined in ionic liquids (ILs). Most of the single water molecules are H-bonded in double donor (DD) configurations either to one anion or to two anions in a 1 : 2 complex. We show that the vibrational stretching modes of such water molecules can be used as sensitive probes for the polarity of the ILs, expressed through dielectric constants. We apply our method to imidazolium salts of the third and fourth generation. We discuss the anion- and cation-dependence and compare our results with other polarity parameters.
Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag
Print ISSN: 0942-9352
Volume: 220, 10/2006
Pages: 1361 - 1376