Electronic spectra of anion radicals of C60 and its derivative in γ-irradiated MTHF solid solutions

The γ-dose dependence of the absorbance of the electronic absorption bands in the near-IR region of the anion radicals produced in MTHF solid solution containing C60 at 77 K was investigated. The bands at λmax=1075 and 950 nm were ascribed to C60− and C602− anion radicals, respectively. In the case of the solid solution containing [5,6]-bis(4-methoxyphenyl)methano[60]fullerene, which was used as a C60 derivative, the bands at λmax=1075 and 1140 nm were ascribed to the mono-anion, and the band at λmax=1025 nm to the di-anion radical of the C60 derivative. It is inferred that the unpaired electron density is delocalized on the C60 moiety with a slight perturbation from the [5,6]-bis(4-methoxyphenyl)-methane functionality.