Chiral Moieties-Oriented Single-Stranded Helical Assembly of Calix[4]azacrown Derivatives

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• 作者：Yang-Fan Guan ; Zheng-Yi Li ; Meng-Fei Ni ; Chen Lin ; Juli Jiang ; Yi-Zhi Li ; Leyong Wang
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：July 6, 2011
• 年：2011
• 卷：11
• 期：7
• 页码：2684-2689
• 全文大小：999K
• 年卷期：v.11,no.7(July 6, 2011)
• ISSN：1528-7505

文摘

Bridging of calix[4]arene derivatives with optically active subunits derived from chiral l/d-amino alcohols has resulted in two novel calix[4]azacrowns enantiomers S-C₅₁H₆₄NO₇路CH₃OH路H₂O (S-1) and R-C₅₁H₆₄NO₇路CH₃OH路H₂O (R-1), which were crystallized separately. Single crystal X-ray diffraction studies revealed that they each encapsulate a methanol molecule by weak interactions and that they form supramolecular enantiomeric helical arrangements along the crystallographic axis, which are constructed via C鈥揌路路路O hydrogen bonds involving bridging water molecules. A similar helical arrangement was also found in the crystal structure of a previously reported calix[4]azacrown compound S-C₁₀₈H₁₄₆N₂O₁₆ (S-2).