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Keywords:

  • conformational switching;
  • conformation analysis;
  • dihydrogenphosphate ions;
  • hydrogensulfate ions;
  • molecular locks;
  • UV/Vis spectroscopy
Thumbnail image of graphical abstract

Lock up your valuables: Receptor 1 acts as a “molecular lock” and anions act as “keys”; H2PO4 can “lock” 1 by switching it from its “unlocked” conformation, however, the structurally similar HSO4 cannot “lock” receptor 1 as evidenced by single-crystal X-ray analysis (see scheme). The “unlocked–locked” conformational switching of 1 was investigated by monitoring changes in fluorescence intensity in the presence of different anions.