Abstract
Tb-metallofullerenes and single-wall carbon nanotubes (SWNTs) have been selectively synthesized with dc arc discharge under 50−200 and 600 Torr helium atmosphere, respectively, by using Tb/Ni/C composite rods as anodes. We propose that only such elements as being able to form acetylides (such as group II and III metals and lanthanides) can generate metallofullerenes in high yield and increase the yield of SWNTs produced with transition metal catalysts such as Fe, Co, or Ni. As the yield of the metallofullerenes is inversely proportional to that of SWNTs, these two kinds of fullerene-related materials have similar precursors in the early stage of their growth and have a competitive mechanism in further processes. Based on the high yield synthesis of metallofullerenes, five isomers of Tb@C82 are produced and four of them are isolated for the first time by multi-stage high-performance liquid chromatography.
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