N-Functionalised heterocyclic dicarbene complexes of silver:: Synthesis and structural studies

A range of new diimidazolium salts, held together by an alkyl unit and bearing alcohol pendant arms on their nitrogen, was synthesized. A short modular reaction pathway leads to the N-heterocyclic carbene (NHC) precursors, differing by the flexibility of the bridge, the steric bulk of substituents in alpha-position of the OH groups and the anions. Treatment of diimidazolium salts with Ag2O yields Ag-1(carbene)(2) complexes. The related trimethylene-bridged bis-NHC silver complexes 6 and 7 were crystallised with ditosylate and di-hexafluorophosphate anions, respectively. Their X-ray structures revealed dimeric species, involving two ligands with different arrangements around the Ag cations, leading to crossed and parallel conformations. (c) 2007 Elsevier B.V. All rights reserved.