Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Photochemical Decomposition of α, α-Diphenyl-β-picrylhydrazyl (DPPH) in Solution. I. A Kinetic Study of the Reaction
Atuo SuzukiMakoto TakahasiKengo Shiomi
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1963 Volume 36 Issue 6 Pages 644-650


Studies of the photochemical decomposition of DPPH in solution have been made by the kinetic method.
1) The decomposition proceeds by means of the light in the region of the first absorption band of DPPH (λmax=520mμ), and the decomposition rate has a linear dependence on the amount of light absorbed.
2) A rate expression fitting the kinetic experiment has been obtained, and this expression has been compared with the rate expession derived on the basis of the possible reaction mechanism, which includes the process of the reaction of an excited DPPH with another, normal DPPH.
3) An increase in the rate with the reaction temperature has been observed in the temperature range10∼50°C, and the two constants determined in the experiment have been related to the rate constants of the elementary processes in the proposed reaction mechanism.

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