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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
Abstract
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 inmore »
- Authors:
-
- University of Hawaii at Manoa, Honolulu, HI (United States)
- Samara National Research University (Russia); Lebedev Physical Institute, Samara (Russia)
- Florida International University, Miami, FL (United States)
- Publication Date:
- Research Org.:
- Univ. of Hawaii at Manoa, Honolulu, HI (United States); Florida International Univ. (FIU), Miami, FL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Russian Federation
- OSTI Identifier:
- 1996094
- Grant/Contract Number:
- FG02-03ER15411; FG02-04ER15570; 075-15-2021-597
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Molecular Physics
- Additional Journal Information:
- Related Information: https://www.tandfonline.com/doi/full/10.1080/00268976.2023.2234509; Journal ID: ISSN 0026-8976
- Publisher:
- Taylor & Francis
- Country of Publication:
- United States
- Language:
- English
- Subject:
- Reaction dynamics; astrochemistry; alkylated PAHs; HAVA; 1-propynyl
Citation Formats
Medvedkov, Iakov A., Nikolayev, Anatoliy A., He, Chao, Yang, Zhenghai, Mebel, Alexander M., and Kaiser, Ralf I. 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. United States: N. p., 2023.
Web. doi:10.1080/00268976.2023.2234509.
Medvedkov, Iakov A., Nikolayev, Anatoliy A., He, Chao, Yang, Zhenghai, Mebel, Alexander M., & Kaiser, Ralf I. 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. United States. https://doi.org/10.1080/00268976.2023.2234509
Medvedkov, Iakov A., Nikolayev, Anatoliy A., He, Chao, Yang, Zhenghai, Mebel, Alexander M., and Kaiser, Ralf I. Thu .
"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". United States. https://doi.org/10.1080/00268976.2023.2234509.
@article{osti_1996094,
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},
author = {Medvedkov, Iakov A. and Nikolayev, Anatoliy A. and He, Chao and Yang, Zhenghai and Mebel, Alexander M. and Kaiser, Ralf I.},
abstractNote = {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.},
doi = {10.1080/00268976.2023.2234509},
journal = {Molecular Physics},
number = ,
volume = ,
place = {United States},
year = {Thu Jul 20 00:00:00 EDT 2023},
month = {Thu Jul 20 00:00:00 EDT 2023}
}
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