Synthesis, Structures, and Reactivity of Transition Metal Complexes Containing a Three-Coordinate Carbido Ligand

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Despite the universal occurrence of planar three-coordinate carbon atoms in covalent substances, there has been no example of such carbon atoms bound to three transition metal centers. In this study, we have for the first time synthesized and characterized a transition metal carbido complex that features the unique trigonal planar geometry of the carbido carbon atom. We have found that the three-coordinate carbido ligand forms π-bonds with transition metal d orbitals and can act as a useful molecular model of surface carbide species generated on heterogeneous transition metal catalyst surfaces.