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Keywords:

  • anion recognition;
  • cage compounds;
  • host–guest systems;
  • interpenetration;
  • supramolecular chemistry
Thumbnail image of graphical abstract

Packed in like sardines: Three BF4 ions are packed into the three cavities of an interpenetrated dimer of a coordination cage (see scheme). While the inner BF4 ion is tightly bound inside the central position, the loosely bound outer anions can be replaced with halide anions by an allosteric binding mechanism and a concerted structural change. In particular, Cl is bound with great affinity.