A pyrene-based N‑heterocyclic carbene: study of its coordination chemistry and stereoelectronic properties

摘要

A new pyrene-N-heterocyclic carbene ligand has been obtained and coordinated to rhodium and iridium,affording the corresponding [MCl(NHC)(COD)] and [MCl(NHC)(CO)2] complexes (M = Ir, Rh). The presence of thepyrene backbone allows the introduction of a η6-bonded [RuCp]+ fragment and facilitates the formation of the correspondingheterometallic complexes of Rh/Ru and Ir/Ru. The stereoelectronic properties of the new ligand have been studied by means ofIR spectroscopy and cyclic voltammetry and demonstrate that the introduction of the [RuCp]+ fragment results in the reductionof the electron-donating power of the ligand