Chemistry of nuclear recoil18F Atoms. IV. Hot F-to-HF and F-to-F2 abstraction in CH3CF3

Norris J. Parks, Kenneth A. Krohn, John W. Root

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

New hot abstraction reaction channels have been demonstrated for nuclear recoil 18F atoms reacting with fluorocarbon substrates. Hot F-to-HF abstraction in CH3CF3 is a very efficient process with an absolute hot yield of 51%±3%. Hot F-to-F2 reactions also occur, but with much lower efficiencies. The F-to-F2 absolute hot yields in CH3CF3, C2F6, and C 3F6 are 5.4%±0.3%, 6.9%±0.8%, and 11.7%±0.5%, respectively. In good agreement with theoretical expectations, translational excitation appears to be much more effective as a driving force for the exoergic F-to-HF process in comparison with the endoergic F-to-F2 process. The Arrhenius activation energy for thermal F-to-HF abstraction in CH3CF3 is at least 2.1±0.1 kcal/mole larger than the value associated with the thermal 18F-atom pi-addition process in C2F6.

Original languageEnglish (US)
Pages (from-to)2690-2698
Number of pages9
JournalThe Journal of Chemical Physics
Volume55
Issue number6
DOIs
StatePublished - Jan 1 1971

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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