ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Using the flash photolysis resonance fluorescence technique, absolute rate constants were determined for the gas phase reactions of hydroxyl radicals with a series of aliphatic polyethers. At 298 K, the measured rate constants (in units of 10-12 cm3 molecule-1 s-1) were: 2,2-dimethoxypropane, (3.9 ± 0.2); 2,2-diethoxypropane, (11.7 ± 1.3); 1,2-dimethoxypropane, (14.3± 1.5); 2-methoxyethylether, (17.5 ± 1.1); 2-ethoxyethlyether, (26.8 ± 2.4); 1,1-dimethoxyethane, (8.9 ± 1.0); and 1,1,3-trimethoxypropane, (16.7 ± 1.0).The temperature dependencies of the rate constants for 2,2-dimethoxypropane and 2,2-diethoxypropane, reactions (1) and (2), were studied over the temperature range 240-440 K and are expressed by the Arrhenius equations: \documentclass{article}\pagestyle{empty}\begin{document}$$k_{\rm 1} = (3.55\,\, \pm 0.39)\,\, \times \,\,10^{ - 12} \,\,\exp [(30 \pm 35)\,/T]\,\,{\rm cm}^{\rm 3} \,\,{\rm molecule}^{{\rm - 1}} {\rm s}^{{\rm - 1}}$$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$$k_{\rm 2} = (1.06\,\, \pm 0.25)\,\, \times \,\,10^{ - 11} \,\,\exp [(15 \pm 75)\,/T]\,\,{\rm cm}^{\rm 3} \,\,{\rm molecule}^{{\rm - 1}} {\rm s}^{{\rm - 1}}$$\end{document} Implications of the results are discussed in terms of reaction mechanisms and the prediction of gas phase OH radical reaction rates for aliphatic polyethers.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550211210
