The crystal structures of three cryptates are reported, those of sodium and potassium iodide and caesium thiocyanate with a macrobicyclic system containing eight heteroatoms; in all three structures the alkali-metal ion is completely enclosed in the cavity of the ligand.
B. Metz, D. Moras and R. Weiss, J. Chem. Soc. D, 1971, 444 DOI: 10.1039/C29710000444
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