January 2009

Cyclic C3H radical

The cyclic C3H radical (c-C3H) was observed first in the laboratory and then toward TMC-1 from Nobeyama Radio Observatory by Yamamoto et al. in 1987. Mangum & Wootten observed c-C3H in 13 additional sources. A theoretical study by Ochsenfeld et al. concluded that c-C3H could be formed efficiently in the interstellar medium through the reaction of carbon atoms with acetylene.

c-C3H is a radical of cyclopropenylidene and is therefore also a carbene, where the bridging carbon only forms two single bonds with the other two carbons.

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