PHOTOSENSITIZED REDUCTION OF OXYGEN TO SUPEKOXIDE BY CYANINE DYES

Chinese Journal of Magnetic Resonance ›› 1994, Vol. 11 ›› Issue (4): 353-360.

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PHOTOSENSITIZED REDUCTION OF OXYGEN TO SUPEKOXIDE BY CYANINE DYES

Chen Ciping¹, Zhou Benmao¹, Lu Dauhui², Xu Guangzhi²

1. Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101;
2. Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080

Received:1993-11-26 Revised:1994-04-09 Published:1994-12-05 Online:2018-01-20

Abstract

Abstract: Photosensitized reduction of oxygen to superoxide anion by cyanine dyes in dimethyl sulphoxide slaturatcd with oxygen has been studied by ESR. In aqueous solutions the hydroxide radical observed after irradiation originates from primarily formed O₂^·. The superoxide anion formation is due to photo-initiated electron transfer from the cyanine dyes to the dissolved oxygen. The intensity of ESR signals of the solutions containing various dyes used as photosensitizers is correlated with the redox potentials of dyes.

Key words: Spin trapping, Cyanine dyes, Superoxide anion

Chen Ciping, Zhou Benmao, Lu Dauhui, Xu Guangzhi. PHOTOSENSITIZED REDUCTION OF OXYGEN TO SUPEKOXIDE BY CYANINE DYES[J]. Chinese Journal of Magnetic Resonance, 1994, 11(4): 353-360.

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PHOTOSENSITIZED REDUCTION OF OXYGEN TO SUPEKOXIDE BY CYANINE DYES

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