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Keywords:

  • fullerenes;
  • lanthanum;
  • structure elucidation;
  • supramolecular chemistry;
  • X-ray diffraction
Thumbnail image of graphical abstract

Tubular! The detection of a series of very large, soluble endofullerenes extending from La2C90 to La2C138 proves that endohedral metal doping is an effective strategy for stabilizing these giant molecules. The X-ray structure of the most abundant isomer, La2@D5(450)-C100 (see image), shows a tubular structure featuring a long La–La distance and maximal separation of pentagons within the cage framework.