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Gas-Phase Synthesis of Triphenylene (C18H12)

Journal Article · · ChemPhysChem
 [1];  [2];  [2];  [2];  [2];  [3];  [3];  [4];  [5];  [5];  [6];  [7]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States). Dept. of Chemistry; University of Hawaii at Manoa
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
  3. Samara National Research Univ. (Russia)
  4. Samara National Research Univ. (Russia); Lebedev Physical Inst. of RAS, Samara (Russia). Dept. of Chemical and Electric Discharge Lasers
  5. Florida International Univ., Miami, FL (United States). Dept. of Chemistry and Biochemistry
  6. Samara National Research Univ. (Russia); Florida International Univ., Miami, FL (United States). Dept. of Chemistry and Biochemistry
  7. Univ. of Hawaii at Manoa, Honolulu, HI (United States). Dept. of Chemistry

For the last decades, the hydrogen-abstraction-acetylene-addition (HACA) mechanism has been widely invoked to rationalize the high-temperature synthesis of PAHs as detected in carbonaceous meteorites (CM) and proposed to exist in the interstellar medium (ISM). By unravelling the chemistry of the 9-phenanthrenyl radical ([C14H9]$$^\bullet$$) with vinylacetylene (C4H4) during our work, we present the first compelling evidence of a barrier-less pathway leading to a prototype tetracyclic PAH – triphenylene (C18H12) – via an unconventional hydrogen abstraction–vinylacetylene addition (HAVA) mechanism operational at temperatures as low as 10 K. The barrier-less, exoergic nature of the reaction reveals HAVA as a versatile reaction mechanism that may drive molecular mass growth processes to PAHs and even two-dimensional, graphene-type nanostructures in cold environments in deep space thus leading to a better understanding of the carbon chemistry in our universe through the untangling of elementary reactions on the most fundamental level.

Research Organization:
Univ. of Hawaii, Honolulu, HI (United States); Florida International Univ., Miami, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; Ministry of Education and Science of the Russian Federation
Grant/Contract Number:
FG02-03ER15411; FG02-04ER15570; AC02-05CH11231
OSTI ID:
1603092
Alternate ID(s):
OSTI ID: 1608266
OSTI ID: 1494647
Journal Information:
ChemPhysChem, Journal Name: ChemPhysChem Journal Issue: 6 Vol. 20; ISSN 1439-4235
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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