Difference of Coordination between Alkali- and Alkaline-Earth-Metal Ions to a Symmetrical α,α′,δ,δ′-Tetramethylcucurbituril
2011-08-01T00:00:00Z (GMT) by
To explore differences in coordination between alkali- and alkaline-earth-metal ions and cucurbit[n]urils, a water-soluble α,α′,δ,δ′-tetramethylcucurbituril (TMeQ) was used to synthesize a series of complexes and their supramolecular assemblies, based on the coordination of TMeQ with alkali- and alkaline-earth-metal ions. The complexes and corresponding supramolecular assemblies were structurally characterized by single-crystal X-ray diffraction. Unlike cucurbituril (Q), which formed the metal–Q polymers based on the direct coordination of carbonyl oxygen atoms to the alkali-metal ions, TMeQ formed metal–TMeQ polymers based on the direct coordination of carbonyl oxygen atoms with the alkaline-earth-metal ions rather than the alkali-metal ions.
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