Transition metal carbyne complex

[2] The HOMO of the carbyne ligand interacts with the LUMO of the metal to create the σ-bond.

The two π-bonds are formed when the two HOMO orbitals of the metal back-donate to the LUMO of the carbyne.

Alternatively, amino-substituted carbyne ligands sometimes form upon protonation of electron-rich isonitrile complexes.

Tricobalt derivatives are prepared by treating cobalt carbonyl with haloforms:[6] Monomeric metal carbyne complexes exhibit fairly linear M–C–R linkages according to X-ray crystallography.

Schrock carbynes on the other hand typically have higher oxidation state metals and electron-donating/anionic ligands.

[13] A sulfur-based main group analog of a carbyne complex has been prepared by Seppalt and coworkers.

[14] The compound, trifluoro(2,2,2-trifluoroethylidyne)-λ6-sulfurane, F3C–C≡SF3, prepared by dehydrofluorination of F3C–CH=SF4 or F3C–CH2–SF5, is an unstable gas that readily undergoes dimerization to form trans-(CF3)(SF3)C=C(CF3)(SF3) at above –50 °C.