Ferrocenyl imidazolium salts as a new class of anion receptors with C-H•••X- hydrogen bonding

Ferrocenylimidazolium salts have been synthesised as novel anion receptors. H-1 NMR studies showed that these compounds bind Cl-, Br-, I-, NO3- and HSO4- anions strongly in CDCl3 through C-H ... X- hydrogen bonding. (C) 2000 Elsevier Science Ltd. All rights reserved.