Supramolecular Switching between Flat Sheets and Helical Tubules Triggered by Coordination Interaction

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• 作者：Suyong Shin ; Sunhee Lim ; Yongju Kim ; Taehoon Kim ; Tae-Lim Choi ; Myongsoo Lee
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：135
• 期：6
• 页码：2156-2159
• 全文大小：303K
• 年卷期：v.135,no.6(February 13, 2013)
• ISSN：1520-5126

文摘

Here we report the spontaneous formation of switchable sheets in aqueous solution, which is based on bent-shaped aromatic amphiphiles containing m-pyridine units at the terminals and a hydrophilic dendron at the apex. The aromatic segments self-assemble into flat sheets consisting of a zigzag conformation through 蟺鈥撓€ stacking interactions. Notably, the sheets reversibly transform into helical tubules at higher concentration and into discrete dimeric macrocycles at a lower concentration in response to Ag(I) ions through reversible coordination interactions between the pyridine units of the aromatic segments and the Ag(I) ions. While maintaining the coordination bonding interactions, the helical tubules reversibly transform into the dimeric macrocycles in response to the variation in concentration.