Intramolecular kinetic isotope effect in the reaction of fluorine atoms with methane-d2 (CH2D2)
- 1 January 1974
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 60 (1) , 49-52
- https://doi.org/10.1063/1.1680806
Abstract
The relative rates of the two competing isotopic reactions: F + CH2D2 → HF + CHD2 and F + CH2D2 → DF + CH2D, were measured in a fast flow system by direct mass spectrometric analysis of the reaction products in the temperature range of 159° to 298°K. The ratio of rates can be expressed as an Arrhenius type equation: kF+HCHD2/kF+DCH2D = (0.81 ± 0.03) exp[(275 ± 15)/R T]. The relation between the intramolecular isotope effect kF+HCHD2/kF+DCH2D and the intermolecular isotope effect kF+CH4/kF+CD4 is discussed with regard to secondary isotope effects in the fluorine atom + methane reaction.Keywords
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