Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
88 (1988), S. 5983-5984
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Multiphoton laser photolysis of CHBr3 and laser-induced fluorescence detection of CH(X 2Π) radicals is utilized for the direct measurement of rate constants for CH reaction with a series of cycloalkanes. Experiments are performed over the temperature range 295 to 670 K and over the pressure range 30 to 300 Torr. The following Arrhenius equations result: CH+c-C3H6, k=(5.30±0.27)×10−11 exp [(1050±40)/RT] cm3 s−1; CH+c-C5H10, k=(2.66±0.33)×10−10 exp [(400±80)/RT] cm3 s−1; CH+c-C6H12, k=(3.07±0.12)×10−10 exp [(300±30)/RT] cm3 s−1. No change in the measured rates with pressure is observed. A mechanism that involves CH radical insertion into the CH bonds on the cycloalkanes followed by rapid decomposition of the excited adduct is invoked to explain the observed kinetic behavior. A correlation of room temperature rate constant vs number of C–H bonds in the reactant is presented.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.454516
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