Ethynyl radical

Ethynyl radical

Names
Preferred IUPAC name Ethynyl
Identifiers
CAS Number	2122-48-7 N
3D model (JSmol)	Interactive image Interactive image
Beilstein Reference	1814004
ChEBI	CHEBI:30085 Y
ChemSpider	109883 Y
Gmelin Reference	48916
PubChem CID	123271
CompTox Dashboard (EPA)	DTXSID40175448
InChI InChI=1S/C2H/c1-2/h1H Y Key: XEHVFKKSDRMODV-UHFFFAOYSA-N Y InChI=1/C2H/c1-2/h1H Key: XEHVFKKSDRMODV-UHFFFAOYAZ
SMILES C#[C] [C]#C
Properties
Chemical formula	C2H
Molar mass	25.030 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

The ethynyl radical (systematically named λ³-ethyne and hydridodicarbon(C—C)) is an organic compound with the chemical formula C≡CH (also written [CCH] or C
₂H). It is a simple molecule that does not occur naturally on Earth but is abundant in the interstellar medium. It was first observed by electron spin resonance isolated in a solid argon matrix at liquid helium temperatures in 1963 by Cochran and coworkers at the Johns Hopkins Applied Physics Laboratory.^[1] It was first observed in the gas phase by Tucker and coworkers in November 1973 toward the Orion Nebula, using the NRAO 11-meter radio telescope.^[2] It has since been detected in a large variety of interstellar environments, including dense molecular clouds, bok globules, star forming regions, the shells around carbon-rich evolved stars, and even in other galaxies.