Acta Crystallographica Section E: Crystallographic Communications (Apr 2018)

Synthesis and crystal structures of 2-bromo-1,3-dimethylimidazolium iodides

  • Martin Lampl,
  • Gerhard Laus,
  • Volker Kahlenberg,
  • Klaus Wurst,
  • Hubert Huppertz,
  • Herwig Schottenberger

DOI
https://doi.org/10.1107/S2056989018003390
Journal volume & issue
Vol. 74, no. 4
pp. 497 – 501

Abstract

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Attempts at direct bromination of 1,3-dimethylimidazolium salts were futile. The title compounds, 2-bromo-1,3-dimethylimidazolium iodide chloroform 0.33-solvate, C5H8BrN2+·I−·0.33CHCl3, 2-bromo-1,3-dimethylimidazolium iodide dichloromethane hemisolvate, C5H8BrN2+·I−·0.5CH2Cl2, and 2-bromo-1,3-dimethylimidazolium iodide hemi(diiodide), C5H8BrN2+·I−·0.5I2, were obtained by methylation of 2-bromo-1-methylimidazole. They crystallized as CHCl3, CH2Cl2 or I2 solvates/adducts. The Br atom acts as a σ-hole to accept short C—Br...I interactions. C—H...I hydrogen bonds are observed in each structure.

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