作者:Kyoung-Jin Chang、Young-Jae An、Hyounsoo Uh、Kyu-Sung Jeong
DOI:10.1021/jo0490548
日期:2004.10.1
hydrogen-bonding interactions between rings 2a and 2b and rods 1a and 1b. The rods contain a binding site for the ring as well as a stimulus-responsive diazo group, both of which are conformationally constrained in parallel by connecting them to a rigid xanthene skeleton. The trans isomer of 1a bearing a rigid binding site cannot form the pseudorotaxanes with the rings 2a and 2b because the neighboring
已经描述了两种表现出刺激响应的组装和拆卸的互锁的超分子复合物。一种是由环2a和2b与杆1a和1b之间的氢键相互作用驱动的假轮烷。棒包含一个环的结合位点以及一个刺激响应的重氮基团,通过将它们连接到刚性的an吨骨架上,这两个结构平行地受到构象约束。带有刚性结合位点的1a的反式异构体不能与环2a和2b形成假轮烷,因为相邻的重氮苯基空间上屏蔽了结合位点。但是,当反式- 1A被转化为相应的顺式- 1A通过UV光,所述pseudorotaxanes立即用70±10μM的缔合常数形成- 1 ×10和(1.1±0.1)3中号- 1为图2a和2b中,分别在CDCl 3在24±1°C下。当在80-85°C加热20分钟时,假轮烷完全分解成其分子成分。通过交替地重复照射和加热,组装和拆卸过程可以可逆地循环。在杆1b的情况下即具有柔性的结合位点,顺式和反式异构体可以形成具有的缔合常数(2.0±0.3)×10相应pseudorotaxanes