May 2025
Cyanoacetylene
allene

The initial discovery of cyanoacetylene allene (CH2CCHC3N) toward TMC-1 was reported in 2021 by Shingledecker and co-workers, based on observations with the 100m Green Bank Telescope as part of the GOTHAM survey. The detection was confirmed in 2022 by Fuentetaja and co-workers, supported by oberservations with the 40m Yebes Telescope as part of the QUIJOTE survey.

Researcher Links
Shingledecker et al. 2021
Fuentetaja et al. 2022

Both detections were based on rotational constants for cyanoacetylene allene (or hexa-4,5-diene-2-ynenitrile) measured by McCarthy and co-workers.

In addition to cyanoacetylene allene, two other allenyl compounds have been detected to date, cyanoallene and allenyl diacetylene. The parent compound propadiene (allene) doesn't have a dipole moment and is thus cannot be detected via rotational transitions. Cyanoacetylene allene is also a member of the huge group of detected CN-containing compounds.


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