The reaction of C 2 F 5 radicals with H 2 S

The reaction of C 2 F 5 radicals with H 2 S\documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {(2)} & {{\rm C}_{\rm 2} {\rm H}_{\rm 5} + {\rm H}_{\rm 2} {\rm S} \to {\rm C}_{\rm 2} {\rm F}_{\rm 5} {\rm H} + {\rm HS}} & {k_H } \\ \end{array}$$\end{document} was studied over the range 1°−123°C using C 2 F 5 radicals generated by photolysis of perfluoropropionic anhydride. The rate constant k H for reaction (2) is given by\documentclass{article}\pagestyle{empty}\begin{document}$$\log {\rm }k_H ({\rm cm}^{\rm 3} {\rm mole}^{ - 1} \sec ^{ - 1}) = (11.70 \pm 0.19) - (4260 \pm 290)/\theta$$\end{document} where θ = 2.303 RT /cal mole −1 . The relevance of this result to conflicting published data on the analogous reaction between CF 3 radicals and H 2 S is discussed. It is concluded that there is little difference in the Arrhenius parameters for reaction of CF 3 and C 2 F 5 radicals with H 2 S.