ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Absolute rate constants for the gas phase reaction of OH radicals with pyrrole (k1) and thiophene (k2) have been measured over the temperature ranges 298-440 and 274-382 K, respectively, using the flash photolysis-resonance fluorescence technique. The rate constants obtained were independent of the total pressure of argon diluent over the range 25-100 torr andwere fit by the Arrhenius expressions \documentclass{article}\pagestyle{empty}\begin{document}$$ k_1 = (2.7 \pm _{0.6} ^{0.8}) \times 10^{ - 11} \exp [(403 \pm 93)/T]{\rm cm}^{\rm 3} {\rm molecule}^{{\rm - 1}} {\rm s}^{{\rm - 1}} $$\end{document} and \documentclass{article}\pagestyle{empty}\begin{document}$$ k_2 = (1.2_{ - 0.6} ^{ + 1.0}) \times 10^{ - 12} \exp [(584 \pm 217)/]{\rm cm}^{\rm 3} {\rm molecule}^{{\rm - 1}} {\rm s}^{{\rm - 1}} $$\end{document} with rate constants at 298 ± 2 K of k1 = (1.03 ± 0.06) × 10-10 cm3 molecule-1 s-1 and k2 = (8.9 ± 0.7) × 10-12 cm3 molecule-1 s-1. [These errors represent two standard deviations (systematic errors could constitute an additional ca. 10% uncertainty)]. These results are discussed with respect to the previous literature data and the atmospheric lifetimes of pyrrole and thiophene.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550180407
