Kinetics of the competitive chlorinations of some perfluoroalkyl iodides determination of the bond dissociation energies D (CD 3 ‐I), D ,(C 2 F 5 ‐I), and D ,( i ,‐C 3 F 7 ‐I)

The reactions\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm Cl}\,\, + \,\,{\rm RI} \to {\rm ICI}\,\, + \,\,{\rm R} $$\end{document}(R = CF 3 , C 2 F 5 , and i ,‐C 3 F 7 ) have been studied competitively in the gas phase over the range of 27–231°C. The following Arrhenius parameters were obtained:Textlog A ,(cm 3 /mol · s) E ,(kJ/mol)R = CF 3 13.99 ± 0.21 17.1 ± 2.0 R = C 2 F 5 13.97 ± 0.20 11.5 ± 2.0 R = i ,‐C 3 F 7 14.18 ± 0.20 10.2 ± 2.0The above data lead to bond dissociation energies D (R‐I) which are compared with previous published results. The following values are recommended: D ,(CF 3 ‐I) = 224, D ,(C 2 F 5 ‐I) = 219, and D ,( i ,‐C 3 F 7 ‐I) = 215 kJ/mol.