Abstract
In the evolving field of fullerenes, nanotubes and endohedral metallofullerenes, the isolated-pentagon rule (IPR)1 is sacrosanct — exceptions have been predicted2,3, but no bare carbon cages with adjacent pentagons have been characterized. Small organic molecules with metal-stabilized fused five-membered rings (pentalenes) have been created4, however, and here we describe a family of non-classical endohedral metallofullerenes with the general structure AxSc3−xN@C68 (where x = 0–2, A is a rare-earth metal, Sc is scandium and N is nitrogen) that has a non-IPR cage of only 68 carbon atoms containing annelated five-membered rings. This internal ring network is metal-stabilized and is accessible for external organic reaction chemistry.
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41586_2000_BF35044199_MOESM1_ESM.jpg
The 121.5 MHz 45Sc NMR spectrum for Sc3N@C68 dissolved in CS2, 107, 000 scans, spectrum is externally referenced to ScCl3.
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Stevenson, S., Fowler, P., Heine, T. et al. A stable non-classical metallofullerene family. Nature 408, 427–428 (2000). https://doi.org/10.1038/35044199
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DOI: https://doi.org/10.1038/35044199
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