Synthesis, structural diversity, and applications of mesoionic 1,2,3-triazol-5-ylidene metal complexes, an update (2017–2020)

Abstract

Over the last one and half decades, mesoionic 1,2,3-triazoly-5-ylidenes (tzNHCs) have been extensively used as ligand precursors for the synthesis of various transition metal complexes. Thus, the current progress of mesoionic 1,2,3-triazoly-5-ylidene metal complexes is of great importance in synthetic organometallic and organic chemistry. This review describes recent progress made in the rapidly developing field of mesoionic 1,2,3-triazol-5-ylidene metal complexes (metals: silver, gold, rhodium, ruthenium, iridium, palladium, osmium, molybdenum, and iron). In particular with their design, synthesis, characterization, reactivity and their catalytic, photophysical, and medicinal applications. We believe, this review will become a helpful source of information for every synthetic chemist in the field. In summary, it covers the reported literature from 2017 to 2020.