Near-IR and ESR studies of the radical anions of C60 and C70 in the system fullerene-primary amine

It is shown by near-IR that the anion radicals C70− and C702- are formed in vacuum by interaction between the fullerenes C70 and 1-amino-3-propanol (AP) and 1,5-diaminopentane (DAP). The temperature dependence of the ESR spectra for the systems C60-AP, C70-AP and C70-DAPA were studied. At low temperature (15–45 K) the ESR spectrum for C60− is similar to that for species with an axially symmetric g-factor. The anisotropy of the signals is averaged out with increasing temperature. The averaged line broadens with further temperature growth, the sharp signal at g = 2.0001 being superimposed on this wide line. The ESR spectrum in the system C70-AP at 12.5 K may be tentatively described as a superposition of two ESR spectra, namely the ESR of a radical (assumed to be a cation radical) and of C70−.