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Science. 2018 Jan 12;359(6372):202-205. doi: 10.1126/science.aao4890.

Detection of the aromatic molecule benzonitrile (c-C6H5CN) in the interstellar medium.

Author information

1
National Radio Astronomy Observatory, Charlottesville, VA 22903, USA.
2
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA.
3
Department of Astronomy, University of Virginia, Charlottesville, VA 22904, USA.
4
Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia.
5
Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA.
6
School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.

Abstract

Polycyclic aromatic hydrocarbons and polycyclic aromatic nitrogen heterocycles are thought to be widespread throughout the universe, because these classes of molecules are probably responsible for the unidentified infrared bands, a set of emission features seen in numerous Galactic and extragalactic sources. Despite their expected ubiquity, astronomical identification of specific aromatic molecules has proven elusive. We present the discovery of benzonitrile (c-C6H5CN), one of the simplest nitrogen-bearing aromatic molecules, in the interstellar medium. We observed hyperfine-resolved transitions of benzonitrile in emission from the molecular cloud TMC-1. Simple aromatic molecules such as benzonitrile may be precursors for polycyclic aromatic hydrocarbon formation, providing a chemical link to the carriers of the unidentified infrared bands.

PMID:
29326270
DOI:
10.1126/science.aao4890

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