NOVEL STRUCTURES FROM ARC-VAPORIZED CARBON AND METALS - SINGLE-LAYER CARBON NANOTUBES AND METALLOFULLERENES

By covaporizing metals with carbon in a fullerene generator, diverse f ullerene-related structures can be produced. Adding cobalt to the grap hite anode leads to the production of single-layer carbon nanotubes. W e find that the relative abundance of tubes with different diameters c an be successfully altered by the presence of various catalyst promote rs such as sulfur, bismuth, or lead. If Sc is covaporized in the are, many Sc-containing metallofullerenes form abundantly. Purified Sc-3@C- 82 has been obtained by HPLC techniques, and its dynamics have been in vestigated using electron paramagnetic resonance spectroscopy. The unu sually large, strongly temperature-dependent linewidths and the temper ature-dependent hyperfine coupling suggest that the Sc atoms form a tr imer which rapidly reorients within the C-82 cage.