The unique photophysical properties of photoactive NHC transition metal complexes have enabled their promising emergence as potential photosensitisers and photocatalysts in a wide range of catalytic processes. In this Minireview, we summarise key structural motifs and fundamental photophysical characteristics of photoactive NHC transition metal complexes and highlight representative bond-forming reactions.

Abstract

This Minireview presents and discusses recent developments in photoactive/photoluminescent N-heterocyclic carbene (NHC) transition metal complexes and their viability as catalysts in bond-forming photocatalysis. Specifically, we summarise key structural motifs adopted by photoactive NHC transition metal complexes and highlight some of their photophysical properties. Representative examples of their applications as catalysts in bond-forming photochemical reactions are also showcased presenting the state-of-the-art and future opportunities for this exciting class of NHC transition metal complexes.