Absolute rate constants for the gas-phase reactions of O(3P) atoms with CF2CFCl and (E/Z)-CFClCFCl at 298 K. Reactivity trends of the halogen-substituted ethenes series
✍ Scribed by Mariano A. Teruel; Raul A. Taccone; Silvia I. Lane
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 153 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0538-8066
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✦ Synopsis
Abstract
Absolute rate coefficients for the gas‐phase reactions of CF~2~CFCl and (E/Z)‐CFClCFCl with O(^3^P) atoms have been measured at 298 K using a discharge flow tube coupled to a chemiluminescence detection system. The observed rate constant values are (4.5 ± 0.4) × 10^−13^ and (1.5 ± 0.3) × 10^−13^ cm^3^ molecule^−1^ s^−1^, respectively. The experiments were carried out under pseudo‐first‐order conditions with [O(^3^P)]~0~ ≪ [alkene]~0~. These results are compared to those of O atom reactions with other chlorine‐ and fluorine‐substituted ethenes. Different factors that affect the rate of addition to the double bond are considered. The O(^3^P)/chloroethenes reactions do not obey the reactivity trend with the ionization potential, as is the case in the alkene and methyl‐substituted alkene reactions. © 2004 Wiley Periodicals, Inc. Int J Chem Kinet 36:525–533, 2004