Carbide and Cumulene Complexes

Caleulations have indicated that bonds between transition metals and terminal carbon atoms are quite strong, with bond dissociation enthalpies comparable to those of 

Ligands with chains of carbon atoms that have cumulated (consecutive) double bonds, designated cumulenylidene ligands, are also known. Such metallacumulene complexes have drawn interest because of possible applications as 1-dimensional molecular wires and for nse in nanoscale optical devices. In recent years, complexes with 2- and 3-carbon chains have also been developed as effective catalysts. Metallacumulene complexes with carbon chains containing three or more atoms have recently been reviewed.  

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