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Electron spin resonance and kinetic study of the photolysis of p-Flouranil (tetrafluoro-p-benzoquinone) in dioxane

✍ Scribed by H. M. Vyas; J. K. S. Wan

Publisher
John Wiley and Sons
Year
1974
Tongue
English
Weight
307 KB
Volume
6
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The photochemistry of p‐fluoranil in dioxane was studied by electron spin resonance (ESR) and the ESR‐rotating sector technique. The transient photoradical is identified as the p‐tetrafluorobenzosemiquinone neutral radical with a hyperfine splitting of 1.1 gauss for the hydroxy proton and the fluorine hyperfine splittings of 3.8 and 14.1 gauss for the meta and ortho fluorines, respectively. The radicals decayed by self‐disproportionation with a second‐order rate constant at room temperature of approximately 3.2 × 10^9^M^−1^s^−1^. The activation energy of the decay process is found to be about 2.4 ± 0.4 kcal/mole.

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