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Keywords:

  • anion complexation;
  • host–guest chemistry;
  • molecular recognition
Thumbnail image of graphical abstract

Up to now cationic hosts were necessary for the molecular recognition of hydrophilic anions in water. This task can, however, also be performed with the cage molecule 1 having zero net charge. The vital design feature is the rigid separation of substructures of unlike charge, which enables encapsulation of the guest in the central cavity.