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. 1977 Sep-Oct;22(5):761-5.

[Nature of the electron-excited state in redox reactions of pigments. I. Photooxidation of chlorophyll a by n-benzoquine]

[Article in Russian]
N E Andreeva, B I Barashkov, G V Zakharova, V V Shubin, A K Chibisov
  • PMID: 911894

[Nature of the electron-excited state in redox reactions of pigments. I. Photooxidation of chlorophyll a by n-benzoquine]

[Article in Russian]
N E Andreeva et al. Biofizika. 1977 Sep-Oct.

Abstract

A method for studying the nature of electronic excited state under photooxidation is proposed. It is shown by an example of the oxidation of chlorophyll a with p-benzoquinone that the formation of cation-radicals of pigments proceeds only through the triplet state. On the basis of experimental data the values of the rate constants of formation of chlorophyll cation-radicals through the singlet-excited state (K2(1)--10(7) M-1 s-1) and triplet state (Kr=10(9) M-1 s-1) of the pigment are evaluated.

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