Halogen interactions in 2,4,5-tribromoimidazolium salts

Abstract

The crystal structures of 2,4,5-tribromo-1-(prop-2-ynyl)imidazole and seven new 1,3-dialkyl-2,4,5-tribromoimidazolium salts (R1 = propenyl, propynyl, dibromopropenyl; R2 = Me, Et) with halogen-containing anions (tetrafluoroborate, hexafluorophosphate, triflimide) were determined. The structures revealed halogen⋯halogen and anion⋯π interactions. Contacts of the type Br⋯Br, Br⋯F, Br⋯O, Br⋯N, F⋯F, H⋯Br, H⋯F, F⋯π and O⋯π were identified. Specific interactions were quantified by Hirshfeld surface analysis. © 2011 by the authors; licensee MDPI, Basel, Switzerland.