Journal article
Theoretical study on the reaction of the phenoxy radical with O2, OH, and NO2
International Journal of Quantum Chemistry, Vol.112(3), pp.848-857
2011
Abstract
Unlike the chemistry underlying the self-coupling of phenoxy (C 6H 5O) radicals, there are very limited kinetics data at elevated temperatures for the reaction of the phenoxy radical with other species. In this study, we investigate the addition reactions of O 2, OH, and NO 2 to the phenoxy radical. The formation of a phenoxy-peroxy is found to be very slow with a rate constant fitted to k = 1.31 × 10 -20T 2.49 exp (-9300/T) cm 3/mol/s in the temperature range of (298-2,000 K) where the addition occurs predominantly at the ortho site. Our rate constant is in line with the consensus of opinions in the literature pointing to the observation of no discernible reaction between the oxygen molecule and the resonance-stabilized phenoxy radical. Addition of OH at the ortho and para sites of the phenoxy radical is found to afford adducts with sizable well depths of 59.8 and 56.0 kcal/mol, respectively. The phenoxy-NO 2 bonds are found to be among the weakest known phenoxy-radical bonds (1.7-8.7 kcal/mol). OH- and O 2-initiated mechanisms for the degradation of atmospheric phenoxy appear to be negligible and the fate of atmospheric phenoxy is found to be controlled by its reaction with NO 2.
Details
- Title
- Theoretical study on the reaction of the phenoxy radical with O2, OH, and NO2
- Authors/Creators
- M. Batiha (Author/Creator) - Al-Hussein Bin Talal UniversityA.H. Al-Muhtaseb (Author/Creator) - Al-Hussein Bin Talal UniversityM. Altarawneh (Author/Creator) - Al-Hussein Bin Talal University
- Publication Details
- International Journal of Quantum Chemistry, Vol.112(3), pp.848-857
- Publisher
- John Wiley and Sons Inc.
- Identifiers
- 991005545179307891
- Copyright
- © 2011 Wiley Periodicals, Inc.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 7 Engineering & Materials Science
- 7.177 Combustion
- 7.177.238 Combustion Dynamics
- Web Of Science research areas
- Chemistry, Physical
- Mathematics, Interdisciplinary Applications
- Physics, Atomic, Molecular & Chemical
- Quantum Science & Technology
- ESI research areas
- Chemistry