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Title: Pyrene synthesis in circumstellar envelopes and its role in the formation of 2D nanostructures

Journal Article · · Nature Astronomy
 [1];  [1]; ORCiD logo [2];  [2]; ORCiD logo [2];  [3];  [3];  [3];  [4]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States). Dept. of Chemistry
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
  3. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Kavli Energy Nano Sciences Inst.
  4. Florida International Univ., Miami, FL (United States). Dept. of Chemistry and Biochemistry

For the past decades, the hydrogen-abstraction/acetylene-addition (HACA) mechanism has been instrumental in attempting to untangle the origin of polycyclic aromatic hydrocarbons (PAHs) as identified in carbonaceous meteorites such as Allende and Murchison. However, the fundamental reaction mechanisms leading to the synthesis of PAHs beyond phenanthrene (C14H10) are still unknown. By exploring the reaction of the 4-phenanthrenyl radical (C14H9•) with acetylene (C2H2) under conditions prevalent in carbon-rich circumstellar environments, we show evidence of a facile, isomer-selective formation of pyrene (C16H10). Along with the hydrogen-abstraction/vinylacetylene-addition (HAVA) mechanism, molecular mass growth processes from pyrene may lead through systematic ring expansions not only to more complex PAHs, but ultimately to 2D graphene-type structures. These fundamental reaction mechanisms are crucial to facilitate an understanding of the origin and evolution of the molecular universe and, in particular, of carbon in our Galaxy.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231; FG02-03ER15411
OSTI ID:
1461139
Alternate ID(s):
OSTI ID: 1603085
Journal Information:
Nature Astronomy, Vol. 2, Issue 5; ISSN 2397-3366
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 54 works
Citation information provided by
Web of Science

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Cited By (15)

Gas phase synthesis of [4]-helicene journal April 2019
Low-temperature Formation of Carbonaceous Dust Grains from PAHs journal January 2020
Molecular mass growth through ring expansion in polycyclic aromatic hydrocarbons via radical–radical reactions journal August 2019
Prevalence of non-aromatic carbonaceous molecules in the inner regions of circumstellar envelopes journal October 2019
How to add a five-membered ring to polycyclic aromatic hydrocarbons (PAHs) – molecular mass growth of the 2-naphthyl radical (C 10 H 7 ) to benzindenes (C 13 H 10 ) as a case study journal January 2019
From atoms to aerosols: probing clusters and nanoparticles with synchrotron based mass spectrometry and X-ray spectroscopy journal January 2020
Synthesis of Polycyclic Aromatic Hydrocarbons by Phenyl Addition–Dehydrocyclization: The Third Way journal November 2019
Gas‐Phase Synthesis of Triphenylene (C 18 H 12 ) journal February 2019
Gas‐Phase Synthesis of Triphenylene (C 18 H 12 ) journal March 2019
Nitrogen matters: the difference between PANH and PAH formation journal January 2018
Synthesizing carbon nanotubes in space journal October 2019
Synthesis of Polycyclic Aromatic Hydrocarbons by Phenyl Addition-Dehydrocyclization: The Third Way journal October 2019
A combined experimental and computational study on the reaction dynamics of the 1-propynyl radical (CH 3 CC; X 2 A 1 ) with ethylene (H 2 CCH 2 ; X 1 A 1g ) and the formation of 1-penten-3-yne (CH 2 CHCCCH 3 ; X 1 A′) journal January 2019
Reactivity of the Indenyl Radical (C 9 H 7 ) with Acetylene (C 2 H 2 ) and Vinylacetylene (C 4 H 4 ) journal April 2019
Synthesizing carbon nanotubes in space text January 2019

Figures / Tables (20)


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