Photophysical and photochemical properties of C82 (C2 isomer) have been examined by using a laser flash photolysis method. The transient absorption band of the triplet excited state was observed at 750 nm accompanying an absorption band tail in the near-IR region. The intrinsic triplet lifetime and intersystem crossing quantum yield were estimated to be 56 μs and <0.01, respectively, which were smaller than those of C60 and C70. An absorption band of the radical anion of C82 appeared at 897 nm by chemical reduction with donors such as tetrakis(dimethylamino)ethylene. Photoinduced reduction of C82 was also observed by adopting N,N,N′,N′-tetramethyl-1,4-phenylenediamine as a donor. By photosensitized reaction, oxidation of C82 was confirmed. The reaction rate constant between C82 and BP•+ was 1.0 x 1010 M-1 s-1, indicating effective radical ion formation as observed with other fullerenes (C60, C70, and C76).
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry