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Formation of phenanthrenyl radicals via the reaction of acenaphthyl with acetylene

Journal Article · · Proceedings of the Combustion Institute
 [1];  [2];  [2];  [3];  [4]
  1. Samara National Research Univ. (Russia); Florida International University
  2. Samara National Research Univ. (Russia)
  3. Univ. of California, Berkeley, CA (United States)
  4. Samara National Research Univ. (Russia); Florida International Univ., Miami, FL (United States)
Ab initio G3(MP2,CC)/B3LYP/6–31G** calculations of the potential energy surface for the reaction of 3-acenaphthyl radical with acetylene were combined with Rice-Ramsperger-Kassel-Marcus Master Equation calculations of the temperature- and pressure-dependent reaction rate constants and product branching ratios with the goal to examine the transformation of an edge five-membered ring into a six-membered one. The reaction mechanism has been shown to contain two stages: (1) the formation of 3-ethynylacenaphthylene + H in the 3-acenaphthyl + C2H2 reaction via acetylene addition to the radical site and an H loss, (2) the formation of the 1-phenanthrenyl radical in the 3-ethynylacenaphthylene + H reaction via H addition to the five-membered ring followed by the ring flip. The results of kinetic modeling show this pathway being faster than the pathway proposed earlier featuring the CCH chemisorption on the six-membered ring without involvement of the five-membered ring. A kinetic test demonstrated the dominance of the former pathway for the formation of pyrene from naphthalene. Here, it is expected that the new mechanism plays a major role in the transformation of five-membered rings on edges of PAH structures.
Research Organization:
Florida International Univ., Miami, FL (United States)
Sponsoring Organization:
Ministry of Science and Higher Education of the Russian Federation; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
FG02-04ER15570
OSTI ID:
1766442
Alternate ID(s):
OSTI ID: 1817922
Journal Information:
Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute Journal Issue: 1 Vol. 38; ISSN 1540-7489
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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