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Formation of 5- and 6-methyl-1H-indene (C10H10) via the reactions of the para-tolyl radical (C6H4CH3) with allene (H2CCCH 2) and methylacetylene (HCCCH3) under single collision conditions

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/c4cp04288c· OSTI ID:1602876
 [1];  [2];  [2];  [2];  [3]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States); University of Hawaii at Manoa
  2. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
  3. Florida International Univ., Miami, FL (United States)

The reactions of the p-tolyl radical with allene-d4 and methylacetylene-d4 as well as of the p-tolyl-d7 radical with methylacetylene-d1 and methylacetylene-d3 were carried out under single collision conditions at collision energies of 44–48 kJ mol-1 and combined with electronic structure and statistical (RRKM) calculations. Our experimental results indicated that the reactions of p-tolyl with allene-d4 and methylacetylene-d4 proceeded via indirect reaction dynamics with laboratory angular distributions spanning about 20° in the scattering plane. As a result, the center-of-mass translational energy distribution determined a reaction exoergicity of 149 ± 28 kJ mol-1 and exhibited a pronounced maximum at around 20 to 30 kJ mol-1. In addition, the center-of-mass angular flux distribution T(θ) depicted a forward–backward symmetry and indicated geometric constraints upon the decomposing complex(es). Combining with calculations, these results propose that the bicyclic polycyclic aromatic hydrocarbons, 6-methyl-1H-indene (p1) and 5-methyl-1H-indene (p2), are formed under single collision conditions at fractions of at least 85% in both reaction systems. For the p-tolyl–methylacetylene system, experiments with partially deuterated reactants also reveal the formation of a third isomer p5 (1-methyl-4-(1-propynyl)benzene) at levels of 5–10%, highlighting the importance in conducting reactions with partially deuterated reactants to elucidate the underlying reaction pathways comprehensively.

Research Organization:
Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-03ER15411; FG02-04ER15570
OSTI ID:
1602876
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 16 Vol. 17; ISSN 1463-9076; ISSN PPCPFQ
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Influences of the molecular fuel structure on combustion reactions towards soot precursors in selected alkane and alkene flames journal January 2018
On the formation and the isomer specific detection of methylacetylene (CH 3 CCH), propene (CH 3 CHCH 2 ), cyclopropane (c-C 3 H 6 ), vinylacetylene (CH 2 CHCCH), and 1,3-butadiene (CH 2 CHCHCH 2 ) from interstellar methane ice analogues journal January 2019
Formation of bicyclic polycyclic aromatic hydrocarbons (PAHs) from the reaction of a phenyl radical with cis -3-penten-1-yne journal January 2018
How to add a five-membered ring to polycyclic aromatic hydrocarbons (PAHs) – molecular mass growth of the 2-naphthyl radical (C 10 H 7 ) to benzindenes (C 13 H 10 ) as a case study journal January 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

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