查看文章

Adding 1% of the metallic elements cerium, lanthanum, and yttrium to graphite rod electrodes resulted in different amounts of the hollow higher fullerenes (HHFs) C₇₆-D₂(1), C₇₈-C_2v(2), and C₇₈-C_2v(3) in carbon-arc fullerene-containing soots. The reaction of trifluoroiodomethane with these and other soluble HHFs at 520−550 °C produced 21 new C_76,78,84,90(CF₃)_n derivatives (n = 6, 8, 10, 12, 14). The reaction with C₇₆-D₂(1) produced an abundant isomer of C₂-(C₇₆-D₂(1))(CF₃)₁₀ plus smaller amounts of an isomer of C₁-(C₇₆-D₂(1))(CF₃)₆, two isomers of C₁-(C₇₆-D₂(1))(CF₃)₈, four isomers of C₁-(C₇₆-D₂(1))(CF₃)₁₀, and one isomer of C₂-(C₇₆-D₂(1))(CF₃)₁₂. The reaction with a mixture of C₇₈-D₃(1), C₇₈-C_2v(2), and C₇₈-C_2v(3) produced the previously reported isomer C₁-(C₇₈-C_2v(3))(CF₃)₁₂ (characterized by X-ray crystallography in this work) and the following new compounds: C₂-(C₇₈-C_2v(3 …