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Peter Stange, Dr. Koichi Fumino and Prof. Dr. Ralf Ludwig Ion Speciation of Protic Ionic Liquids in Water: Transition from Contact to Solvent-Separated Ion Pairs Angewandte Chemie International Edition 52

Article first published online: 10 FEB 2013 | DOI: 10.1002/anie.201209609

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The fab four: Far-infrared difference spectra and DFT-calculated properties for mixtures of protic ionic liquids (PILs) and water clearly indicate that a minimum of four water molecules are needed to transfer contact (CIPs) into solvent-separated (SIPs) ion pairs. SIPs are favored over CIPs owing to additional H-bonds and cooperative effects. This enthalpic advantage overcompensates for the entropic penalty of separation by water.

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