Interstellar Detection of the Highly Polar Five-Membered Ring Cyanocyclopentadiene
| Autor: | McCarthy, Michael C., Lee, Kin Long Kelvin, Loomis, Ryan A., Burkhardt, Andrew M., Shingledecker, Christopher N., Charnley, Steven B., Cordiner, Martin A., Herbst, Eric, Kalenskii, Sergei, Willis, Eric R., Xue, Ci, Remijan, Anthony J., McGuire, Brett A. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Much like six-membered rings, five-membered rings are ubiquitous in organic chemistry, frequently serving as the building blocks for larger molecules, including many of biochemical importance. From a combination of laboratory rotational spectroscopy and a sensitive spectral line survey in the radio band toward the starless cloud core TMC-1, we report the astronomical detection of 1-cyano-1,3-cyclopentadiene, $c$-C$_5$H$_5$CN}, a highly polar, cyano derivative of cyclopentadiene, $c$-C$_5$H$_6$. The derived abundance of $c$-C$_5$H$_5$CN} is far greater than predicted from astrochemical models which well reproduce the abundance of many carbon chains. This finding implies either an important production mechanism or a large reservoir of aromatic material may need to be considered. The apparent absence of its closely-related isomer, 2-cyano-1,3-cyclopentadiene, may arise from its lower stability or be indicative of a more selective pathway for formation of the 1-cyano isomer, perhaps one starting from acyclic precursors. The absence of N-heterocycles such as pyrrole and pyridine is discussed in light of the astronomical finding. Comment: Accepted for publication in Nature Astronomy. 36 pages comprising five figures, two tables, five supplementary tables, and six supplementary figures |
| Databáze: | arXiv |
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