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Octatetraynyl radical

Octatetraynyl radical (C₈H) is an organic free radical with eight carbon atoms linked in a chain with alternating single bonds and triple bonds.

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In 2007 negatively-charged octatetraynyl was detected in Galactic molecular source TMC-1, making it the second type of anion to be found in the interstellar medium (after Hexatriynyl radical) and the largest such molecule detected to date.^[1]^[2]

References

^ Remijan, Anthony J.; J. M. Hollis, F. J. Lovas, M. A. Cordiner, T. J. Millar, A. J. Markwick-Kemper, and P. R. Jewell (July 20 2007). "Detection of C₈H^- and Comparison with C₈H toward IRC +10 216". The Astrophysical Journal (664): L47-L50. Retrieved on 2007-07-24.
^ Brünken, S.; H. Gupta, C. A. Gottlieb, M. C. McCarthy, and P. Thaddeus (July 20 2007). "Detection of the Carbon Chain Negative Ion C₈H^- in TMC-1". The Astrophysical Journal (664): L43-L46. Retrieved on 2007-07-24.