The Reaction Between Atomic Fluorine and CF3Br: Evidence for a Pseudotrihalogen Radical Intermediate.
EMORY UNIV ATLANTA GA
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The kinetics of the reaction between atomic fluorine and CF3Br has been investigated in the temperature range 188-373K, using molecular beam analysis in conjunction with an H2 titration to measure the concentration of atomic fluorine in a flow reactor. An unusual temperature dependence, as well as a pressure dependence of the effective rate constant, is explained by a mechanism involving the formation of a stable pseudotrihalogen radical, CF3BrF. The radical reacts with atomic fluorine by competing pathways, which result in either net recombination of atomic fluorine or net consumption of CF3Br. In agreement with the proposed mechanism, CF3Br is found to be at least 12 times more efficient than CF4 as a catalyst for the recombination of fluorine atoms. Modified author abstract
- Physical Chemistry