DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Formation of Benzene and Naphthalene through Cyclopentadienyl-Mediated Radical–Radical Reactions

Journal Article · · Journal of Physical Chemistry Letters
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3];  [4];  [4]; ORCiD logo [5]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States); Florida International University
  2. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Russian Academy of Sciences (RAS), Samara (Russian Federation). P.N. Lebedev Physical Institute
  5. Florida International Univ. (FIU), Miami, FL (United States)

Resonantly stabilized free radicals (RSFRs) have been contemplated as fundamental molecular building blocks and reactive intermediates in molecular mass growth processes leading to polycyclic aromatic hydrocarbons (PAHs) and carbonaceous nanoparticles on Earth and in deep space. Here, by combining molecular beams and computational fluid dynamics simulations, we provide compelling evidence on the formation of benzene via the cyclopentadienyl-methyl reaction and of naphthalene through the cyclopentadienyl self-reaction, respectively. These systems offer benchmarks for the conversion of a five-membered ring to the 6π-aromatic (benzene) and the generation of the simplest 10π-PAH (naphthalene) at elevated temperatures. These results uncover molecular mass growth processes from the “bottom up” via RSFRs in high temperature circumstellar environments and combustion systems expanding our fundamental knowledge of the organic, hydrocarbon chemistry in our universe.

Research Organization:
Florida International Univ. (FIU), Miami, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Ministry of Higher Education and Science of the Russian Federation
Grant/Contract Number:
FG02-04ER15570; FG02-03ER15411; AC02-05CH11231
OSTI ID:
1843970
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 1 Vol. 13; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (48)

Hydrogen Abstraction/Acetylene Addition Revealed journal June 2014
Hydrogen Abstraction/Acetylene Addition Revealed journal June 2014
HACA's Heritage: A Free-Radical Pathway to Phenanthrene in Circumstellar Envelopes of Asymptotic Giant Branch Stars journal March 2017
Valence Ionization Energies of Hydrocarbons journal November 1977
Structures of cyanocyclopentadienes and related compounds journal January 1970
Theory and modeling in combustion chemistry journal January 1996
The CH3+C5H5 reaction: A potential source of benene at high temperatures journal January 1996
Reaction mechanisms in aromatic hydrocarbon formation involving the C5H5 cyclopentadienyl moiety journal January 1996
Pressure dependent kinetic analysis of pathways to naphthalene from cyclopentadienyl recombination journal January 2018
Experimental and kinetic modeling investigation on anisole pyrolysis: Implications on phenoxy and cyclopentadienyl chemistry journal March 2019
Unravelling combustion mechanisms through a quantitative understanding of elementary reactions journal January 2005
On the kinetics of the C5H5+C5H5 reaction journal January 2013
Identification of the molecular-weight growth reaction network in counterflow flames of the C3H4 isomers allene and propyne journal January 2021
Polycyclic aromatic hydrocarbons in the Mukundpura (CM2) Chondrite journal April 2021
A Spectroscopic View on Cosmic PAH Emission journal March 2021
Linking Coregulated Gene Modules with Polycyclic Aromatic Hydrocarbon-Related Cancer Risk in the 3D Human Bronchial Epithelium journal May 2021
An Aromatic Universe–A Physical Chemistry Perspective journal April 2021
When Rate Constants Are Not Enough journal February 2015
Kinetics of the Self Reaction of Cyclopentadienyl Radicals journal February 2015
Formation Mechanisms of Naphthalene and Indene: From the Interstellar Medium to Combustion Flames journal January 2017
Kinetics of the CH 3 + C 5 H 5 Reaction: A Theoretical Study journal November 2017
Photodissociation of the Cyclopentadienyl Radical at 248 nm journal February 2018
Functional Relationships between Kinetic, Flow, and Geometrical Parameters in a High-Temperature Chemical Microreactor journal October 2018
VUV Photoionization Study of the Formation of the Simplest Polycyclic Aromatic Hydrocarbon: Naphthalene (C 10 H 8 ) journal May 2018
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
Computed Rate Coefficients and Product Yields for c -C 5 H 5 + CH 3 → Products journal August 2009
Spectrum of the Cyclopentadienyl Radical journal July 1956
Polycyclic aromatic hydrocarbon formation chemistry in a plasma jet revealed by IR-UV action spectroscopy journal January 2020
Low-temperature formation of polycyclic aromatic hydrocarbons in Titan’s atmosphere journal October 2018
Role of ring-enlargement reactions in the formation of aromatic hydrocarbons journal January 2020
Carbon molecules in space: from astrochemistry to astrobiology journal January 2006
Pahs and Astrobiology journal January 2011
Two‐color photoionization of naphthalene and benzene at threshold journal September 1981
Unimolecular dissociation of cyclopentadiene and indene journal May 1991
Vibronic coupling in the ground cationic state of naphthalene: A laser threshold photoelectron [zero kinetic energy (ZEKE)‐photoelectron] spectroscopic study journal May 1993
The chemistry in circumstellar envelopes of evolved stars: Following the origin of the elements to the origin of life journal August 2006
Formation of polycyclic aromatic hydrocarbons in circumstellar envelopes journal June 1989
[ITAL]Infrared Space Observatory's[/ITAL] Discovery of C[TINF]4[/TINF]H[TINF]2[/TINF], C[TINF]6[/TINF]H[TINF]2[/TINF], and Benzene in CRL 618 journal January 2001
The Synthesis of Benzene in the Proto–planetary Nebula CRL 618 journal August 2002
Nitrogen Incorporation in CH 4 -N 2 Photochemical Aerosol Produced by Far Ultraviolet Irradiation journal April 2012
Dissociation of the benzene molecule by ultraviolet and soft X-rays in circumstellar environment journal April 2009
Interstellar graphite in meteorites: Isotopic compositions and structural properties of single graphite grains from Murchison journal March 1995
Gas-phase synthesis of benzene via the propargyl radical self-reaction journal May 2021
In Situ Discovery of Graphite with Interstellar Isotopic Signatures in a Chondrule-Free Clast in an L3 Chondrite journal May 1998
Resonance-stabilized hydrocarbon-radical chain reactions may explain soot inception and growth journal September 2018
Electronic absorption spectrum of the cyclopentadienyl radical (C 5 H 5 ) and its deuterated derivatives journal April 1970
Interstellar Polycyclic Aromatic Hydrocarbon Molecules journal September 2008
Astrochemistry and Astrobiology: Materials Sciencein Wonderland? journal August 2019