Metal–carbon multiple bonded complexes: Carbene, vinylidene and allenylidene complexes of ruthenium and osmium supported by macrocyclic ligands

In this review, we present our recent studies on the synthesis, structures, spectroscopic and electrochemical properties, and reactivities of ruthenium/osmium–carbon multiple bonded complexes. The first part of the review deals with the chemistry of ruthenium/osmium porphyrin carbene complexes and related metal carbene complexes (including iron porphyrin carbene complexes and ruthenium carbene complexes supported by salens or polypyridines). The second part describes the chemistry of ruthenium vinylidene and allenylidene complexes supported by macrocyclic tertiary amine ligands Me3tacn (1,4,7-trimethyl-1,4,7-triazacyclononane) and 16-TMC (1,5,9,13-tetramethyl-1,5,9,13-tetraaza-cyclohexadecane).