skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A combined experimental and computational study on the reaction dynamics of the 1-propynyl (CH3CC, X2A1) – propylene (CH3CHCH2, X1A') system: formation of 1,3-dimethylvinylacetylene (CH3CCCHCHCH3, X1A') under single collision conditions

Journal Article · · Molecular Physics

The reaction of the 1-propynyl radical (CH3CC; X2A1) with propylene (CH3CHCH2; X1A') was studied in a crossed molecular beam machine at a collision energy of 37 ± 1 kJ mol–1. Experimental data combined with high-level electronic structure (CCSD(T)-F12/cc-pVTZ-F12//ωB97X-D/6-311G(d,p)) and RRKM calculations reveal the reaction mechanism. Here, the overall barrierless and exoergic reaction involves indirect reaction dynamics and commences preferentially with addition of 1-propynyl with its radical centre to the carbon–carbon double bond at the terminal carbon atom of propylene. This work focuses on molecular mass growth process (hydrogen loss channels) although theory suggests methyl loss as a prevalent channel. In these processes, the C6H9 collision complexes either emit atomic hydrogen or undergo isomerisation followed by atomic hydrogen loss to preferentially yield the cis/trans isomers of 1,3-dimethylvinylacetylene (2-hexen-4-yne) as the primary product. Analysis of reaction dynamics of 1-propynyl and ethynyl radicals with propylene along with their fractional abundance in deep space suggests formation of methyl- and dimethyl derivatives of vinylacetylene in cold molecular clouds. Once formed they may engage in fundamental molecular mass growth processes via the barrierless Hydrogen Abstraction Vinylacetylene Addition mechanism that leads to the formation of methyl- and dimethylnaphthalenes thus providing a versatile route to methyl-substituted PAHs in interstellar medium.

Research Organization:
Univ. of Hawaii at Manoa, Honolulu, HI (United States); Florida International Univ. (FIU), Miami, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Russian Federation
Grant/Contract Number:
FG02-03ER15411; FG02-04ER15570; 075-15-2021-597
OSTI ID:
1996094
Journal Information:
Molecular Physics, Related Information: https://www.tandfonline.com/doi/full/10.1080/00268976.2023.2234509; ISSN 0026-8976
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

References (89)

Reaction of the ethynyl radical, C2H, with methylacetylene, CH3CCH, under single collision conditions: Implications for astrochemistry journal February 2001
Pyrene synthesis in circumstellar envelopes and its role in the formation of 2D nanostructures journal March 2018
Mid-infrared spectra of WC 9 stars - The composition of circumstellar and interstellar dust journal September 1989
Photodissociation dynamics of propyne at 157 nm journal April 2000
Untangling the chemical evolution of Titan's atmosphere and surface–from homogeneous to heterogeneous chemistry journal January 2010
Molecular weight growth in Titan's atmosphere: branching pathways for the reaction of 1-propynyl radical (H 3 CCC˙) with small alkenes and alkynes journal January 2015
Scintillation Type Mass Spectrometer Ion Detector journal March 1960
A Study of the 3.3 and 3.4 μm Emission Features in Proto–Planetary Nebulae journal June 2007
Organic constituents of meteorites—a review journal September 1967
Discovery of Interstellar Propylene (CH 2 CHCH 3 ): Missing Links in Interstellar Gas-Phase Chemistry journal August 2007
Low-temperature formation of polycyclic aromatic hydrocarbons in Titan’s atmosphere journal October 2018
Synthesis of Polycyclic Aromatic Hydrocarbons by Phenyl Addition-Dehydrocyclization: The Third Way journal October 2019
Design of a modular and versatile interlock system for ultrahigh vacuum machines: A crossed molecular beam setup as a case study journal March 2006
A simple and efficient CCSD(T)-F12 approximation journal December 2007
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
H and D release in ∼243.1 nm photolysis of vibrationally excited 3ν1, 4ν1, and 4νCD overtones of propyne-d3 journal May 2004
Formation of Three C 4 H 3 N Isomers from the Reaction of CN (X 2 Σ + ) with Allene, H 2 CCCH 2 (X 1 A 1 ), and Methylacetylene, CH 3 CCH (X 1 A 1 ):  A Combined Crossed Beam and Ab Initio Study journal May 2002
Hydrogen-Abstraction/Acetylene-Addition Exposed journal October 2016
Elucidating the Chemical Dynamics of the Elementary Reactions of the 1-Propynyl Radical (CH 3 CC; X 2 A 1 ) with Methylacetylene (H 3 CCCH; X 1 A 1 ) and Allene (H 2 CCCH 2 ; X 1 A 1 ) journal June 2019
Chemical complexity in the Horsehead photodissociation region journal January 2014
Gaussian basis sets for use in correlated molecular calculations. I. The atoms boron through neon and hydrogen journal January 1989
Origin of organic matter in the early solar system—VII. The organic polymer in carbonaceous chondrites journal September 1977
The mystery of unidentified infrared emission bands journal February 2022
The Infrared Spectrum of Protonated Naphthalene and its Relevance for the Unidentified Infrared Bands journal August 2009
Polycyclic aromatic hydrocarbons in the Mukundpura (CM2) Chondrite journal April 2021
Experimental Investigation on the Formation of Carbon-Bearing Molecules in the Interstellar Medium via Neutral−Neutral Reactions journal May 2002
The formation of Polycyclic Aromatic Hydrocarbons in evolved circumstellar environments journal January 2011
A novel route for PAH growth in HACA based mechanisms journal December 2012
Exchange reactions of alkali atoms with alkali halides: a collision complex mechanism journal January 1967
An Experimental and Theoretical Study on the Formation of 2-Methylnaphthalene (C 11 H 10 /C 11 H 3 D 7 ) in the Reactions of the Para-Tolyl (C 7 H 7 ) and Para-Tolyl-d7 (C 7 D 7 ) with Vinylacetylene (C 4 H 4 ) journal April 2014
Molecular Reaction Dynamics book January 2005
On the formation of polyacetylenes and cyanopolyacetylenes in Titan's atmosphere and their role in astrobiology journal January 2012
A crossed molecular beam study on the reaction of methylidyne radicals [CH(X 2 Π)] with acetylene [C 2 H 2 (X 1 Σ g + )]—competing C 3 H 2 + H and C 3 H + H 2 channels journal January 2011
Interaction of MeV ions and VUV photons with polymers and high molecular hydrocarbons journal March 1992
Low temperature formation of naphthalene and its role in the synthesis of PAHs (Polycyclic Aromatic Hydrocarbons) in the interstellar medium journal December 2011
Mixed aromatic–aliphatic organic nanoparticles as carriers of unidentified infrared emission features journal October 2011
Polycyclic aromatic hydrocarbon formation in carbon-rich stellar envelopes journal December 1992
A combined crossed molecular beam and theoretical investigation of the reaction of the meta-tolyl radical with vinylacetylene – toward the formation of methylnaphthalenes journal January 2015
HACA's Heritage: A Free-Radical Pathway to Phenanthrene in Circumstellar Envelopes of Asymptotic Giant Branch Stars journal March 2017
Molecular abundances in OMC-1 - The chemical composition of interstellar molecular clouds and the influence of massive star formation journal April 1987
Astrochemistry: From Molecular Clouds to Planetary Systems: IAU Symposium 1971 journal February 2000
Spectroscopic properties of polycyclic aromatic hydrocarbons (PAHs) and astrophysical implications journal January 1997
Molecular-beam scattering report July 1983
Formation of polycyclic aromatic hydrocarbons in circumstellar envelopes journal June 1989
Alkylation of polycyclic aromatic hydrocarbons in carbonaceous chondrites journal March 2005
Long-range corrected hybrid density functionals with damped atom–atom dispersion corrections journal January 2008
Simplified CCSD(T)-F12 methods: Theory and benchmarks journal February 2009
An Aromatic Universe–A Physical Chemistry Perspective journal April 2021
A Combined Experimental and Computational Study on the Reaction Dynamics of the 1-Propynyl (CH 3 CC)–Acetylene (HCCH) System and the Formation of Methyldiacetylene (CH 3 CCCCH) journal July 2018
Polycyclic aromatic hydrocarbons in carbonaceous chondrites can be used as tracers of both pre-accretion and secondary processes journal October 2022
[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
Evidence that polycyclic aromatic hydrocarbons in two carbonaceous chondrites predate parent-body formation journal April 2003
Combined Experimental and Computational Study on the Reaction Dynamics of the 1-Propynyl (CH 3 CC)–1,3-Butadiene (CH 2 CHCHCH 2 ) System and the Formation of Toluene under Single Collision Conditions journal April 2019
Polycyclic aromatic hydrocarbons, carbon nanoparticles and the diffuse interstellar bands journal January 2006
Formation of benzene in the interstellar medium journal December 2010
Indigenous Polycyclic Aromatic Hydrocarbons in Circumstellar Graphite Grains from Primitive Meteorites journal July 1998
Photodissociation of benzene under collision-free conditions: An ab initio /Rice–Ramsperger–Kassel–Marcus study journal April 2004
Laboratory investigation on the formation of unsaturated nitriles in Titan’s atmosphere journal April 2000
Reaction Dynamics in Astrochemistry: Low-Temperature Pathways to Polycyclic Aromatic Hydrocarbons in the Interstellar Medium journal April 2015
Discovery of the Pure Polycyclic Aromatic Hydrocarbon Indene (c-C9H8) with GOTHAM Observations of TMC-1 journal May 2021
Polycyclic Aromatic Hydrocarbons and the Diffuse Interstellar Bands: A Survey journal November 1999
A Barrierless Pathway Accessing the C9H9 and C9H8 Potential Energy Surfaces via the Elementary Reaction of Benzene with 1-Propynyl journal November 2019
Isotopic evidence from an Antarctic carbonaceous chondrite for two reaction pathways of extraterrestrial PAH formation journal December 2000
Fullerenes, fulleranes and polycyclic aromatic hydrocarbons in the Allende meteorite journal July 1997
Gas-Phase Study of the Elementary Reaction of the D1-Ethynyl Radical (C2D; X2Σ+) with Propylene (C3H6; X1A′) under Single-Collision Conditions journal March 2022
A new Reference Chemical Composition for Tmc-1 journal August 2016
Crossed Molecular Beam Study on the Formation of Phenylacetylene and Its Relevance to Titan’s Atmosphere journal April 2010
Astrobiology – the final frontier in chemical reaction dynamics journal January 2002
Unusual 3 micron emission features in three proto-planetary nebulae journal March 1992
The Carriers of the Interstellar Unidentified Infrared Emission Features: Aromatic or Aliphatic? journal November 2012
Isomer discrimination of polycyclic aromatic hydrocarbons in the Murchison meteorite by resonant ionization journal December 2008
Aromatics and Cyclic Molecules in Molecular Clouds: A New Dimension of Interstellar Organic Chemistry journal March 2021
Reactions of ethynyl radicals as a source of C4 and C5 hydrocarbons in Titan's atmosphere journal June 2002
THE CARRIERS OF THE INTERSTELLAR UNIDENTIFIED INFRARED EMISSION FEATURES: CONSTRAINTS FROM THE INTERSTELLAR C-H STRETCHING FEATURES AT 3.2-3.5 μm journal October 2013
Low-temperature gas-phase formation of indene in the interstellar medium journal January 2021
Global investigation of potential energy surfaces for the pyrolysis of C 1 –C 3 hydrocarbons: toward the development of detailed kinetic models from first principles journal January 2015
Crossed Molecular Beams Study on the Formation of Vinylacetylene in Titan’s Atmosphere journal October 2009
The chemistry in circumstellar envelopes of evolved stars: Following the origin of the elements to the origin of life journal August 2006
A crossed molecular beams study of the reaction of the ethynyl radical (C2H(X2Σ+)) with allene (H2CCCH2(X1A1)) journal January 2009
A New Component of the Interstellar Matter: Small Grains and Large Aromatic Molecules journal September 1989
Hydrogen Abstraction/Acetylene Addition Revealed journal June 2014
Aromatic moieties in meteoritic macromolecular materials: analyses by hydrous pyrolysis and δ13C of individual compounds journal January 2000
Polycyclic aromatic hydrocarbon processing in a hot gas journal February 2010
Polycyclic aromatic hydrocarbon processing in interstellar shocks journal February 2010
Interstellar Polycyclic Aromatic Hydrocarbon Molecules journal September 2008
Prediction of Reaction Barriers and Thermochemical Properties with Explicitly Correlated Coupled-Cluster Methods: A Basis Set Assessment journal August 2012
Discrimination of product isomers in the photodissociation of propyne and allene at 193 nm journal March 1999
Chemical dynamics of d1-methyldiacetylene (CH3CCCCD; X 1A1) and d1-ethynylallene (H2CCCH(C2D); X 1A′) formation from reaction of C2D(X 2Σ+) with methylacetylene, CH3CCH(X 1A1) journal February 2001
Carbon molecules in space: from astrochemistry to astrobiology journal January 2006

Similar Records

Theoretical Study of the Reaction of the Methylidyne Radical (CH; X2Π) with 1-Butyne (CH3CH2CCH; X1A')
Journal Article · Thu Oct 21 00:00:00 EDT 2021 · Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory · OSTI ID:1996094

Elucidating the chemical dynamics of the elementary reactions of the 1-propynyl radical (CH3CC; X2A1) with 2-methylpropene ((CH3)2CCH2; X1A1)
Journal Article · Wed Jan 31 00:00:00 EST 2024 · Physical Chemistry Chemical Physics. PCCP · OSTI ID:1996094

Elucidating the Chemical Dynamics of the Elementary Reactions of the 1-Propynyl Radical (CH3CC; X2A1) with Methylacetylene (H3CCCH; X1A1) and Allene (H2CCCH2; X1A1)
Journal Article · Sun Jun 09 00:00:00 EDT 2019 · Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory · OSTI ID:1996094