A small tris(imidazolium) cage forms an N-heterocyclic carbene complex with silver(I)

Chem Commun (Camb). 2007 Sep 21:(35):3634-6. doi: 10.1039/b708692j. Epub 2007 Aug 7.

Abstract

A small, sterically rigid tris(imidazolium) cyclophane reacts with Ag2O to give an Ag(I) carbene complex in which one of the imidazolium moieties remains protonated.