ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The rate of the gas phase reaction \documentclass{article}\pagestyle{empty}\begin{document}$$\Delta - {\rm CH}_{\rm 2} - {\rm I + I} \cdot {\rightleftharpoons}\Delta - {\rm CH}_{\rm 2} \cdot + {\rm I}_{\rm 2}$$\end{document} has been measured spectrophotometrically over the range 480°-550°K. The rate constant fits the equation \documentclass{article}\pagestyle{empty}\begin{document}$${\rm log}k{\rm (M}^{- {\rm 1}} {\rm sec}^{- {\rm 1}} {\rm)} = {\rm (11}{\rm .4} \pm {\rm 0}{\rm .1)} - (16.8 \pm 0.2)/\theta$$\end{document} where θ = 2.303RT in kcal/mole. This result, together with the assumption that the activation energy for the back reaction is 0 ± 1 kcal/mole, allows calculation of DH0298 (Δ—CH2—H) = 97.4 ± 1.6 kcal/mole and ΔH0f 298 (Δ—CH2·) = 51.1 ± 1.6 kcal/mole. These values correspond to a stabilization energy of 0.4 ± 1.6 kcal/mole in the cyclopropylcarbinyl radical.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550030406