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. Author manuscript; available in PMC: 2017 Jul 7.
Published in final edited form as: Chem Commun (Camb). 2016 Jul 7;52(57):8787–8801. doi: 10.1039/c6cc03669d

Scheme 2.

Scheme 2

Modes of anion recognition using divalent metal ion complexes. (A) Receptor with strongly bound metal ions acts as a single molecular unit for anion binding. (B) Three-component assembly process in which both metals bind strongly to the receptor scaffold only in the presence of a suitable complementary anion.