The discovery and investigation of new rhenium(I) carbene complexes is reported. Special attention is paid to complexes of the fac-[(CO)3ReBr(L)] type, where L represents a chelating bis-NHC ligand consisting of two alkylene  bridged (R') N-substituted (R) imidazoline moieties (1,1'-di-R-3,3'-R'-diimidazolin-2,2'-diylidene). Generating a free coordination site at these complexes, by treating them with weakly coordinating anions (WCAs), resulted in the generation of the first rhenium CCC pincer complex. Depending on the chemical nature of the WCA, either the cationic rhenium(I) species with a free coordination site is formed or its uncharged pincer derivative. Additionally to the unusual way to synthesize the latter complexes, we also present the spectroscopic and structural characterization of these novel compounds.

Rhenium carbene chemistry with WCAs: Discovery of the first rhenium CCC pincer complex

244th National Meeting (2012)

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