Controlling the Molecular Shuttling of pH‐Responsive [2]Rotaxanes with Two Different Stations
Controlling the Molecular Shuttling of pH‐Responsive [2]Rotaxanes with Two Different Stations
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DOI：
10.1002/slct.202300687
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发表时间：
2023-03
期刊：
影响因子：
2.1
通讯作者：
Nanami Takiguchi;Shohei Yamazaki;M. Murata;Shintaro Kawano;M. Shizuma;M. Muraoka
中科院分区：
文献类型：
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作者：
Nanami Takiguchi;Shohei Yamazaki;M. Murata;Shintaro Kawano;M. Shizuma;M. Muraoka
提出了一种具有两种不同胺位的简并[2]轮烷的新合成方法。变温1h NMR和旋转框架核Overhauser效应相关光谱实验表明，三氟乙酸的加入引发了分子穿梭。即使改变了外站的胺，运动的激活屏障也保持不变。相反，樟脑磺酸的加入引起了旋转运动，通过合成新的无外站[2]轮烷并检测其在酸存在下的分子行为证明了这一点。
A novel synthesis of degenerate [2]rotaxanes with two different amine stations is presented. Variable‐temperature1H NMR and rotating‐frame nuclear Overhauser effect correlation spectroscopy experiments revealed that the addition of trifluoroacetic acid initiates molecular shuttling. The activation barrier for the motion remained constant even when the amine in the outer station was changed. Conversely, the addition of camphorsulfonic acid caused a rotational motion, which was demonstrated by synthesizing a new [2]rotaxane without an outer station and examining its molecular behavior in the presence of acid.