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The cyanovinyl radical (H2CCCN) was detected by
Cabezas and co-workers and reported in 2023.
It was observed toward
TMC-1 with the
Yebes 40m telescope. Cyanovinyl exists in
ortho and para forms that arise from parallel and antiparallel combinations of the ±1/2 nuclear spin
states of its hydrogen nuclei (as in the
H2 molecule). Both spin states
were detected, as well as
hyperfine structure of the observed rotational
transitions. These traits help to secure the detection.
Many cyano species have been detected, thanks to the
typically substantial dipole moments imparted to the molecules by the polar •C≡N group. The parent
molecule of the cyanovinyl radical, vinyl cyanide, has been known since 1975.
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