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 C 70 − and C 70 2- are formed in vacuum by interaction between the fullerenes C 70 and 1-amino-3-propanol (AP) and 1,5-diaminopentane (DAP). The temperature dependence of the ESR spectra for the systems C 60 -AP, C 70 -AP and C 70 -DAPA were studied. At low temperature (15–45 K) the ESR spectrum for C 60 − 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 C 70 -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 C 70 − .