April 2025
1-Ethynyl
Cyclopentadiene

The detection of 1-ethynyl-cyclopentadiene (C5H5CCH) was announced in 2021 by Cernicharo and co-workers. The molecule was detected toward TMC-1 via 14 rotational transitions using the Yebes 40m telescope located in Castilla-La Mancha. 2-ethynyl-cyclopentadiene was also detected via 24 transitions.

The two analogous cyano derivatives of cylopentadiene have also been detected, as has the parent molecule.

Researcher Links
J Cernicharo
M Agúndez
RI Kaiser
C Cabezas
B Tercero
N Marcelino
JR Pardo
P de Vicente

Like many astromolecules, the isomers of ethynyl cyclopentadiene isomers are not readily available from chemical companies. Measurements of C5H5CCH were performed by McCarthy and co-workers, with the compounds formed by subjecting benzene to electrical discharge. This produces "a rich broth of products" that needed to be carefully analyzed to distinguish the various carriers present.


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