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Abnormal N-heterocyclic Carbenes: More than just Exceptionally Strong Donor Ligands
Krüger, Anneke; Albrecht, Martin
Complexes comprising a so-called abnormal carbene ligand, which displays pronounced mesoionic character, have recently been shown to be competent catalyst precursors for bond activation processes and oxidative transformations, including base-free alcohol oxidation and water oxidation. In this highlight we propose that these abnormal carbene ligands are not just useful spectator ligands but also actively participate in the bond activation step. This mode of action is partially based on the exceptionally strong donor properties of the ligand and, specifically, on the mesoionic character of these abnormal carbenes. The mesoionic properties provide a reservoir for charges and holes and thus induce efficient ligand-metal cooperativity, which is beneficial in particular for oxidation catalysis that involves concerted proton and electron transfer processes. European Research Council Swiss National Science Foundation Alfred Werner Foundation Sasol Ltd.
Keyword(s): Catalysis; Platinum group metals
Publication Date:
Type: Journal article
Peer-Reviewed: Unknown
Language(s): English
Institution: University College Dublin
Publisher(s): CSIRO Publishing
First Indexed: 2015-05-19 05:31:11 Last Updated: 2018-10-11 15:33:33