title: Difference of coordination between alkali- and alkaline-earth-metal ions to a symmetrical α,α',δ,δ'-tetramethylcucurbit[6]uril.
abstract: To explore differences in coordination between alkali- and alkaline-earth-metal ions and cucurbit[n]urils, a water-soluble α,α',δ,δ'-tetramethylcucurbit[6]uril (TMeQ[6]) was used to synthesize a series of complexes and their supramolecular assemblies, based on the coordination of TMeQ[6] 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[6]), which formed the metal-Q[6] polymers based on the direct coordination of carbonyl oxygen atoms to the alkali-metal ions, TMeQ[6] formed metal-TMeQ[6] polymers based on the direct coordination of carbonyl oxygen atoms with the alkaline-earth-metal ions rather than the alkali-metal ions.
authors: Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, People's Republic of China.
authors: Wen-Jian
authors: WJ
authors: Chen
authors: Da-Hai
authors: DH
authors: Yu
authors: Xin
authors: X
authors: Xiao
authors: Yun-Qian
authors: YQ
authors: Zhang
authors: Qian-Jiang
authors: QJ
authors: Zhu
authors: Sai-Feng
authors: SF
authors: Xue
authors: Zhu
authors: Z
authors: Tao
authors: Gang
authors: G
authors: Wei