Carbyne Complex Chemistry and Characterization

Carbyne complexes, defined by a formal metal–carbon triple bond (M≡C), reside at the frontier of organometallic chemistry. These species span a continuum from Fischer‐type carbynes, bearing π‐acceptor substituents that stabilise low‐oxidation metal centres, to Schrock‐type carbynes with strongly donating alkyl or aryl groups bound to high‐oxidation metals. Such complexes offer unique reactivity in catalytic C–H activation, alkyne metathesis and group‐transfer processes. Synthetic approaches typically involve α‐deprotonation of metal‐bound alkylidene precursors, photochemical carbonyl displacement or salt metathesis to introduce the carbyne ligand. Characterisation exploits a combination of single‐crystal X‐ray diffraction, multinuclear NMR spectroscopy, infrared and Raman vibrational analysis, alongside isotopic labelling to confirm metal–carbon bond order and electronic structure. Recent advances have emphasised the role of ligand design in tuning frontier orbitals, enabling controlled carbene versus carbyne reactivity, and have expanded applications to ring‐forming transformations such as cyclopropenylidene generation and spiropentane synthesis. Global interest in these complexes arises from their potential in small‐molecule activation, organic synthesis and the development of novel materials exhibiting linear carbon chains with unusual electronic properties.

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Carbyne Complex Chemistry and Characterization publication trend

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Technical terms

Carbyne complex: A metal complex featuring a formal M≡C triple bond.

Fischer carbyne: A carbyne bearing π‐acceptor substituents, stabilising low‐oxidation metal centres.

Schrock carbyne: A carbyne with strong σ‐donating alkyl or aryl ligands on high‐oxidation metals.

Carbido ligand: A bridging carbon atom formally carrying a negative charge between two or more metal centres.

Cyclopropenylidene: A three‐membered carbene ring formed by interaction of a carbyne fragment with an alkyne.

References

1. Chromium carbides and cyclopropenylidenes. Chemical Science (2021).
2. (Decacarbonyl)(1-isopropyl-2-phenyl-1,2,5,6-tetrahydroacenaphtho [5,6-cd][1,2]diphosphole)ditungsten(0). Molbank (2023).
3. Penta­carbonyl-2κ5C-chlorido-1κCl-bis­[1(η5)-cyclo­penta­dien­yl](μ-1-oxido­ethyl­ene-1:2κ2O:C)chromium(0)zirconium(IV). Acta Crystallographica Section E: Crystallographic Communications (2009).