In the last few decades N-heterocyclic carbenes (NHCs) have emerged as a powerful class of carbon-based ligands. Owing to their unique electronic and steric properties, they have been incorporated in a large variety of catalytically active metal complexes. One of the strategies that have been used to modify the ligand properties of NHCs is annulation with different carbo- and heterocyclic groups. It has been shown that annulation in 4-5 position of the imidazole ring significantly influences the stability and the σ-donor/π-acceptor properties of the carbene species, and this may be used as a versatile tool for the fine-tuning of their electronic properties. Herein, the synthesis and structural characterization of a new class of fused N-heterocyclic carbene ligands with a rigid bidentate architecture will be reported. Complexes of type [M(COD)Cl] and [M(CO)2Cl] (M=Rh and Ir) were prepared and characterized using spectroscopic and crystallographic methods.

New annulated N-heterocyclic carbenes and their transition metal complexes

253rd National Meeting (2017)

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