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 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 (C2·-) 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.
|Number of pages||5|
|Journal||Journal of the Chemical Society, Perkin Transactions 2|
|Publication status||Published - 2002 Nov 28|
ASJC Scopus subject areas