Negative Cooperativity in the Binding of Imidazolium and Viologen Ions to a Pillar[5]arene-Crown Ether Fused Host

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• 作者：Wei-Bo Hu ; Wen-Jing Hu ; Yahu A. Liu ; Jiu-Sheng Li ; Biao Jiang ; Ke Wen
• 刊名：Organic Letters
• 出版年：2015
• 出版时间：June 19, 2015
• 年：2015
• 卷：17
• 期：12
• 页码：2940-2943
• 全文大小：343K
• ISSN：1523-7052

文摘

A pillar[5]arene-crown ether fused bicyclic host 1 was found to be able to recognize an imidazolium ion G1 by its pillar[5]arene subunit and a viologen ion G2 by its crown ether receptor discriminatively. The simultaneous binding of G1 and G2 by 1 resulted in the formation of a three-component host鈥揼uest complex G1鈯?鈯僄2. Negative heterotropic cooperative effects were displayed by G1 and G2 in their binding to 1 and were investigated by stepwise bindings of G1 and G2 to 1.