Lewis Superacidic Ionic Liquids with Tricoordinate Borenium Cations

Sesime Coffie, James M. Hogg, Lucie Cailler, Albert Ferrer-Ugalde, Richard W. Murphy, John D. Holbrey, Fergal Coleman, Malgorzata Swadzba-Kwasny

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19 Citations (Scopus)
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The first examples of ionic liquids based on borenium cations, [BCl2L](+), are reported. These compounds form highly Lewis acidic liquids under solvent-free conditions. Their acidity was quantified by determining the Gutmann acceptor number (AN). Extremely high ANs were recorded (up to AN=182, delta(31P)=120 ppm), demonstrating that these borenium ionic liquids are the strongest Lewis superacids reported to date, with the acidity enhanced by the ionic liquid environment.
Original languageEnglish
Pages (from-to)14970-14973
Number of pages4
JournalAngewandte Chemie International Edition
Issue number49
Early online date23 Oct 2015
Publication statusPublished - 01 Dec 2015


  • borenium cations
  • boron
  • Group 13 elements
  • ionic liquids
  • Lewis acids


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