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Some hydrogen atom abstraction reactions of CF 2 H and CFH 2 radicals, and the CH bond dissociation energy in CF 2 H 2
Author(s) -
Pritchard G. O.,
Perona M. J.
Publication year - 1969
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550010603
Subject(s) - chemistry , arrhenius equation , radical , hydrogen atom abstraction , bond dissociation energy , activation energy , dissociation (chemistry) , hydrogen atom , photochemistry , computational chemistry , organic chemistry , alkyl
By photolyzing (CF 2 H) 2 CO and (CFH 2 ) 2 CO the hydrogen atom abstraction reactions of CF 2 H radicals with (CF 2 H) 2 CO, H 2 , D 2 , CH 4 , C 2 H 6 , n C 4 H 10 and iso C 4 H 10 , and the reactions of CFH 2 radicals with (CFH 2 ) 2 CO and n C 4 H 10 , 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 2 HH) = 97.4 ± 1.3 kcal mole −1 at a mean temperature of 543°K isobtained. 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 2 HH) is approximately 100 kcal mole −1 , and that D(CFH 2 H) is very similar. Other literature data tend to confirm these approximate values.