Low Temperature Formation of Nitrogen-Substituted Polycyclic Aromatic Hydrocarbons (NPAHs)- Barrierless Routes to Dihydro(iso)quinolines
Journal Article
·
· The Astrophysical Journal (Online)
- Univ. of Hawaii at Manoa, Honolulu, HI (United States); University of Hawaii at Manoa
- Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- Bay Area Environmental Research Inst., Petaluma, CA (United States)
- NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States). Space Science and Astrobiology Division
Meteorites contain bio-relevant molecules such as vitamins and nucleobases, which consist of aromatic structures with embedded nitrogen atoms. Questions remain over the chemical mechanisms responsible for the formation of nitrogen-substituted polycyclic aromatic hydrocarbons (PANHs) in extraterrestrial environments. By exploiting single collision conditions, we show that a radical mediated bimolecular collision between pyridyl radicals and 1,3-butadiene in the gas phase forms nitrogen-substituted polycyclic aromatic hydrocarbons (PANHs) 1,4-dihydroquinoline and to a minor amount 1,4-dihydroisoquinoline. The reaction proceeds through the formation of a van der Waals complex, which circumnavigates the entrance barrier implying it can operate at very low kinetic energy and therefore at low temperatures of 10 K as present in cold molecular clouds such as TMC-1. The discovery of facile de facto barrierless exoergic reaction mechanisms leading to PANH formation could play an important role in providing a population of aromatic structures upon which further photo-processing of ice condensates could occur to form nucleobases.
- Research Organization:
- Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- Sponsoring Organization:
- National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- FG02-03ER15411
- OSTI ID:
- 1602919
- Alternate ID(s):
- OSTI ID: 22521757
- Journal Information:
- The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 815; ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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