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| Identifiers | |
|---|---|
3D model (JSmol) |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| C18 | |
| Molar mass | 216.198 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Cyclooctadeca-1,3,5,7,9,11,13,15,17-nonayneorcyclo[18]carbon is a chemical compound, an allotrope of carbon with molecular formula C
18. The molecule is a ring of eightteen carbon atoms, connected by alternating triple and single bonds; thus, it is a polyyne and a cyclocarbon.
Cyclo[18]carbon is the smallest cyclo[n]carbon predicted to be thermodynamically stable, with a computed strain energy of 72 kilocalories per mole.[1][2]
An collaboration of teams at IBM and Oxford University team claimed to synthesize it in solid state in 2019[3]byelectrochemical decarbonylation of several sites of a cyclobutanone structure:[4]
According to these IBM researchers, the electronic structure of their product consists of alternating triple bonds and single bonds, rather than a cumulene-type structure of consecutive double bonds. This supposedly makes this molecule a semiconductor.[4]
