Difference of Coordination between Alkali- and Alkaline-Earth-Metal Ions to a Symmetrical α,α′,δ,δ′-Tetramethylcucurbituril
datasetposted on 01.08.2011, 00:00 by Wen-Jian Chen, Da-Hai Yu, Xin Xiao, Yun-Qian Zhang, Qian-Jiang Zhu, Sai-Feng Xue, Zhu Tao, Gang Wei
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.