Characterization of fullerenes and doped fullerenes

• Published in: Synthetic metals 1993-08, Vol.59 (3), p.279-295
• Main Authors: Yannoni, C.S., Wendt, H.R., de Vries, M.S., Siemens, R.L., Salem, J.R., Lyerla, J., Johnson, R.D., Hoinkis, M., Crowder, M.S., Brown, C.A., Bethune, D.S., Taylor, L., Nguyen, D., Jedrzejewski, P., Dorn, H.C.
• Format: Article
• Language: English
• Subjects: Alloys; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/0379-6779(93)91162-U

The results of a variety of experiments used to characterize fullerenes, metallofullerenes and alkali-metal intercalated C 60 are reported. It is shown that differential scanning calorimetry and NMR characterization of the orientational phase transition in C 60 provide sensitive means to assess the purity and crystallinity of fullerene samples. The results of a mass-spectrometric investigation of metallofullerene samples produced by co-vaporization of carbon and metals are described. An account is given of some electron paramagnetic resonance results obtained for LaC 82 and solid-state NMR results obtained on an alkali-intercalated fullerite, Rb 3C 60, which show for the first time the presence of magnetically inequivalent carbons in underivatized C 60. Together these experiments yield a great deal of information about the phase purity, molecular dynamics and structure of a variety of fullerene materials.