Abstract

ESR spectra of C 70 radical anions were detected for C 70/methylcyclohexane (MCHX) and C 70/2-methyltetrahydrofuran (MTHF) solid solutions which were γ-irradiated at 77 K and subsequently annealed at 107–117 K. The ESR spectrum for C 70/MCHX was a singlet which was ascribed to C 70 −, and was flanked by a pair of satellites due to matrix proton spin flip lines. The ESR spectrum for C 70/MTHF was a superposition of a singlet and a deformed doublet. The latter was unstable and disappeared at 109 K, and was tentatively ascribed to C 70 2−. ESR spectra of C 60 radical anions were partly reinvestigated and are compared to those of C 70. The relative electron attachment efficiencies for C 60 and C 70 at 77 K were estimated, and the former was about twice as large as the latter. Isothermal decay at 77 K was observed for both C 60 and C 70 radical anions.

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