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Keywords:

  • host–guest systems;
  • macrocycles;
  • self-assembly;
  • supramolecular chemistry;
  • tubules
Thumbnail image of graphical abstract

Donuts anyone? Molecules based on a meta-linked aromatic segment self-assemble into hexameric macrocycles that, in turn, stack on top of each other to from elongated tubular helical suprastructures. The formed tubules dissociate into discrete stacks of toroids in response to the addition of silver salt (see picture).