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Some hydrogen atom abstraction reactions of CF2H and CFH2 radicals, and the CH bond dissociation energy in CF2H2

✍ Scribed by G. O. Pritchard; M. J. Perona

Publisher: John Wiley and Sons
Year: 1969
Tongue: English
Weight: 765 KB
Volume: 1
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550010603

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✦ Synopsis

By photolyzing (CF,H),CO and (CFH,),CO the hydrogen atom abstraction reactions of CF,H radicals with (CF,H),CO, H, , D, , CH, , C,H, , n-C,H,, and iso-C,H1,, and the reactions of CFH, radicals with (CFH,),CO and n-C,H,, , have been studied. Arrhenius parameters for these reactions are compared with related systems. From a knowledge of the activation energies for the forward and reverse reactions a value of the bond dissociation energy, D(CF,H-H) = 97.4 f 1.3 kcal mole-' at a mean temperature of 543'K is

obtained. This value is subject to much uncertainty due to possible compensation effects in the Arrhenius parameters. These effects are discussed for this and the other reactions, and the data suggest that D(CF,H-H) is approximately 100 kcal mole-', and that D(CFH,-H) is very similar. Other literature data tend to confirm these approximate values.

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