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HACA's Heritage: A Free-Radical Pathway to Phenanthrene in Circumstellar Envelopes of Asymptotic Giant Branch Stars

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [1];  [2];  [2];  [2];  [2];  [3];  [4];  [4]
  1. Univ. of Hawaii, Honolulu, HI (United States). Dept. of Chemistry
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
  3. Florida Intl Univ., Miami, FL (United States). Dept. of Chemistry and Biochemistry
  4. Samara National Research Univ. (Russian Federation). Dept. of Physics

The hydrogen-abstraction/acetylene-addition (HACA) mechanism has been central for the last decades in attempting to rationalize the formation of polycyclic aromatic hydrocarbons (PAHs) as detected in carbonaceous meteorites such as in Murchison. Nevertheless, the basic reaction mechanisms leading to the formation of even the simplest tricyclic PAHs like anthracene and phenanthrene are still elusive. By exploring the previously unknown chemistry of the ortho-biphenylyl radical with acetylene, we deliver compelling evidence on the efficient synthesis of phenanthrene in carbon-rich circumstellar environments. However, the lack of formation of the anthracene isomer implies that HACA alone cannot be responsible for the formation of PAHs in extreme environments. Considering the overall picture, alternative pathways such as vinylacetylene-mediated reactions are required to play a crucial role in the synthesis of complex PAHs in circumstellar envelopes of dying carbon-rich stars.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; Government of the Russian Federation
Grant/Contract Number:
AC02-05CH11231; FG02-03ER15411; FG02-04ER15570
OSTI ID:
1464146
Alternate ID(s):
OSTI ID: 1602963
OSTI ID: 1376753
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 16 Vol. 56; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

References (44)

Hydrogen Abstraction/Acetylene Addition Revealed journal June 2014
Unexpected Chemistry from the Reaction of Naphthyl and Acetylene at Combustion-Like Temperatures journal March 2015
Hydrogen-Abstraction/Acetylene-Addition Exposed journal October 2016
Hydrogen Abstraction/Acetylene Addition Revealed journal June 2014
Unexpected Chemistry from the Reaction of Naphthyl and Acetylene at Combustion-Like Temperatures journal March 2015
Hydrogen-Abstraction/Acetylene-Addition Exposed journal October 2016
Computational study on the recombination reaction between benzyl and propargyl radicals journal January 2012
Polycyclic aromatic hydrocarbons in the Murchison meteorite journal January 1984
A detailed kinetic modeling study of aromatics formation in laminar premixed acetylene and ethylene flames journal July 1997
Kinetic modeling of soot formation with detailed chemistry and physics: laminar premixed flames of C2 hydrocarbons journal April 2000
Formation pathways of ethynyl-substituted and cyclopenta-fused polycyclic aromatic hydrocarbons journal January 2000
Spectroscopic properties of polycyclic aromatic hydrocarbons (PAHs) and astrophysical implications journal January 1997
Formation of polycyclic aromatic hydrocarbons and their growth to soot—a review of chemical reaction pathways journal August 2000
A novel route for PAH growth in HACA based mechanisms journal December 2012
On the kinetics of the C5H5+C5H5 reaction journal January 2013
Temperature- and pressure-dependent rate coefficients for the HACA pathways from benzene to naphthalene journal January 2017
Interstellar and Circumstellar PAHs journal January 2000
Astrochemistry: From Molecular Clouds to Planetary Systems; Conference Summary journal January 2000
Hydrogen Abstraction Acetylene Addition and Diels−Alder Mechanisms of PAH Formation:  A Detailed Study Using First Principles Calculations journal September 2005
Calculations of Rate Coefficients for the Chemically Activated Reactions of Acetylene with Vinylic and Aromatic Radicals journal November 1994
Time-dependent mass spectra and breakdown graphs. 17. Naphthalene and phenanthrene journal November 1993
Reaction of Phenyl Radicals with Acetylene:  Quantum Chemical Investigation of the Mechanism and Master Equation Analysis of the Kinetics journal September 2003
Ab Initio and DFT Study of the Formation Mechanisms of Polycyclic Aromatic Hydrocarbons:  The Phenanthrene Synthesis from Biphenyl and Naphthalene journal June 2002
The Formation of Naphthalene, Azulene, and Fulvalene from Cyclic C 5 Species in Combustion:  An Ab Initio/RRKM Study of 9-H-Fulvalenyl (C 5 H 5 −C 5 H 4 ) Radical Rearrangements journal September 2007
Formation Mechanism of Polycyclic Aromatic Hydrocarbons beyond the Second Aromatic Ring journal May 2013
Reaction mechanism of soot formation in flames journal February 2002
Polycyclic aromatic hydrocarbons, carbon nanoparticles and the diffuse interstellar bands journal January 2006
Carbon molecules in space: from astrochemistry to astrobiology journal January 2006
A highly efficient growth mechanism of polycyclic aromatic hydrocarbons journal January 2010
Formation of the diphenyl molecule in the crossed beam reaction of phenyl radicals with benzene journal February 2008
The chemistry in circumstellar envelopes of evolved stars: Following the origin of the elements to the origin of life journal August 2006
Charged polycyclic aromatic hydrocarbon clusters and the galactic extended red emission journal March 2007
High molecular diversity of extraterrestrial organic matter in Murchison meteorite revealed 40 years after its fall journal February 2010
Low temperature formation of naphthalene and its role in the synthesis of PAHs (Polycyclic Aromatic Hydrocarbons) in the interstellar medium journal December 2011
Formation of polycyclic aromatic hydrocarbons in circumstellar envelopes journal June 1989
Polycyclic aromatic hydrocarbon formation in carbon-rich stellar envelopes journal December 1992
Detection and Characterization of Cold Interstellar Dust and Polycyclic Aromatic Hydrocarbon Emission, from COBE Observations journal February 1997
Polycyclic Aromatic Hydrocarbons and the Diffuse Interstellar Bands: A Survey journal November 1999
The Infrared Spectrum of Protonated Naphthalene and its Relevance for the Unidentified Infrared Bands journal August 2009
Aromatic Hydrocarbons in the Murchison Meteorite journal July 1971
Complex Organic Interstellar Molecules journal September 2009
Reaction Dynamics in Astrochemistry: Low-Temperature Pathways to Polycyclic Aromatic Hydrocarbons in the Interstellar Medium journal April 2015
A New Component of the Interstellar Matter: Small Grains and Large Aromatic Molecules journal September 1989
Interstellar Polycyclic Aromatic Hydrocarbon Molecules journal September 2008

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Polycyclic aromatic hydrocarbon formation chemistry in a plasma jet revealed by IR-UV action spectroscopy journal January 2020
Synthesis of Polycyclic Aromatic Hydrocarbons by Phenyl Addition–Dehydrocyclization: The Third Way journal November 2019
A Unified Mechanism on the Formation of Acenes, Helicenes, and Phenacenes in the Gas Phase journal March 2020
Synthesis of Polycyclic Aromatic Hydrocarbons by Phenyl Addition-Dehydrocyclization: The Third Way journal October 2019
A Unified Mechanism on the Formation of Acenes, Helicenes, and Phenacenes in the Gas Phase journal January 2020
Valence Photoionization of Thymine: Ionization Energies, Vibrational Structure, and Fragmentation Pathways from the Slow to the Ultrafast journal October 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
Pyrene synthesis in circumstellar envelopes and its role in the formation of 2D nanostructures journal March 2018
Low-temperature formation of polycyclic aromatic hydrocarbons in Titan’s atmosphere journal October 2018
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From atoms to aerosols: probing clusters and nanoparticles with synchrotron based mass spectrometry and X-ray spectroscopy journal January 2020
Synthesizing carbon nanotubes in space journal October 2019
Implications for Extraterrestrial Hydrocarbon Chemistry: Analysis of Acetylene (C 2 H 2 ) and D2-acetylene (C 2 D 2 ) Ices Exposed to Ionizing Radiation via Ultraviolet–Visible Spectroscopy, Infrared Spectroscopy, and Reflectron Time-of-flight Mass Spectrometry journal January 2020
Valence Photoionization of Thymine: Ionization Energies, Vibrational Structure, and Fragmentation Pathways from the Slow to the Ultrafast text January 2019
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