CHARACTERIZATION OF FULLERENES AND DOPED FULLERENES

The results of a variety of experiments used to characterize fullerene s, metallofullerenes and alkali-metal intercalated C60 are reported. I t is shown that differential scanning calorimetry and NMR characteriza tion of the orientational phase transition in C60 provide sensitive me ans to assess the purity and crystallinity of fullerene samples. The r esults of a mass-spectrometric investigation of metallofullerene sampl es produced by co-vaporization of carbon and metals are described. An account is given of some electron paramagnetic resonance results obtai ned for LaC82 and solid-state NMR results obtained on an alkali-interc alated fullerite, Rb3C60, which show for the first time the presence o f magnetically inequivalent carbons in underivatized C60. Together the se experiments yield a great deal of information about the phase purit y, molecular dynamics and structure of a variety of fullerene material s.