Molecular Turnstiles Regulated by Metal Ions

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• 作者：Guangxia Wang ; Hongmei Xiao ; Jiaojiao He ; Junfeng Xiang ; Ying Wang ; Xuebo Chen ; Yanke Che ; Hua Jiang
• 刊名：Journal of Organic Chemistry
• 出版年：2016
• 出版时间：April 15, 2016
• 年：2016
• 卷：81
• 期：8
• 页码：3364-3371
• 全文大小：511K
• 年卷期：0
• ISSN：1520-6904

文摘

A family of novel molecular turnstiles 1–3 composed of two stators with pyridyl binding sites and a different-sized triptycene rotor was synthesized. The molecular turnstiles behave in an open state at room temperature in the absence of metal ions but display significantly different closed states in the presence of Ag⁺ and Pd²⁺. The Ag⁺-mediated turnstiles 1–3Ag exhibited closed states but unreadable bistability at ambient temperature because the Ag⁺-mediated macrocyclic framework is not able to restrict the rotations of the rotors; while temperature was decreased, the macrocyclic frameworks became stable enough to halt the rotations of the rotors, eventually leading to the readable closed states for 1–3Ag. In contrast, Pd²⁺-mediated macrocyclic frameworks are stable, giving rise to a detectable closed state of turnstiles 1–3Pd in a wide range of temperatures. These findings have also been supported by DFT calculations.