Chloro Derivatives of Azafullerenes C59NCl5and Non-Classical C97NCl21

Salvaging Reactive Fullerenes from Soot by Exohedral Derivatization

The awesome allotropy of carbon yields innumerable topologically possible cage structures of molecular carbon. This field is also related to endohedral metallofullerenes constructed by metal-atom encapsulation. Stable and soluble empty fullerenes and endohedral metallofullerenes are available in pure form in macroscopic amounts from carbon arc production or other physical processes followed by extraction and subsequent chromatographic separation. However, many other unidentified fullerene species, which must be reactive and insoluble in their pristine forms, remain in soot. These "missing" species must have extremely small HOMO-LUMO gaps and may have unconventional cage structures. Recent progress in this field has demonstrated that reactive fullerenes can be salvaged by exohedral derivatization, which can stabilize the reactive carbon cages. This concept provides a means of preparing macroscopic amounts of unconventional fullerenes as their derivatives.

Synthesis, Structural Characterization, and Crystal Packing of the Elusive Pentachlorinated Azafullerene C59 NCl5

We report on the synthesis and the structure elucidation of the elusive azafullerene pentachloride C₅₉ NCl₅ , which was obtained by high temperature halogenation of (C₅₉ N)₂ . The exceptionally strong host-guest interaction of the title compound in the solid is discussed.