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Issue 11, 2002
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Direct detection of superoxide anion generated in C60-photosensitized oxidation of NADH and an analogue by molecular oxygen

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Abstract

Visible-light irradiation of poly(vinylpyrrolidone) (PVP)-solubilized C60 in water in the presence of NADH (dihydronicotinamide adenine dinucleotide) and molecular oxygen (O2) results in formation of superoxide anion (O2˙). Formation of O2˙ having a characteristic g value of 2.18 was evidenced by the direct observation with use of a low-temperature EPR technique at 77 K. Photoinduced O2˙ formation was also observed for an N-methyl-2-pyrrolidone (NMP) solution of C60 and 1-benzyl-1,4-dihydronicotinamide (BNAH) in the presence of O2, whereas C60 radical anion (C60˙) was formed in the absence of O2 under otherwise the same experimental conditions. These results suggest that C602− formed in the photoinduced electron-transfer reduction of C60 by BNAH acts as an electron donor to O2 to give O2˙ in NMP.

Graphical abstract: Direct detection of superoxide anion generated in C60-photosensitized oxidation of NADH and an analogue by molecular oxygen

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Publication details

The article was received on 15 Jul 2002, accepted on 06 Aug 2002 and first published on 26 Sep 2002


Article type: Paper
DOI: 10.1039/B206887G
Citation: J. Chem. Soc., Perkin Trans. 2, 2002,0, 1829-1833
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    Direct detection of superoxide anion generated in C60-photosensitized oxidation of NADH and an analogue by molecular oxygen

    I. Nakanishi, K. Ohkubo, S. Fujita, S. Fukuzumi, T. Konishi, M. Fujitsuka, O. Ito and N. Miyata, J. Chem. Soc., Perkin Trans. 2, 2002, 0, 1829
    DOI: 10.1039/B206887G

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