NMR studies of fullerene C60-based compounds

We present NMR studies performed on AnC60 compounds, where A can be K, Rb, I2, O2 and n can be 1, 2, 3 and 6 depending on the system. Using high resolution NMR we have obtained information on the molecular dynamics and the electronic properties of these compounds. The shape of the 13C spectra shows that intercalation of species like K and Rb, with n=6, totally block the molecular reorientation of the C60 at room temperature. On the contrary the effect of O2 is only partial while I2 does not hinder these reorientations. The 13C resonance positions are discussed in the light of existing theories concerning the NMR shifts in insulating and conducting media. (orig.)