插销式分子器件——可利用酸碱调控的超分子准轮烷

Plunger-scale Molecular-Level Machines——Supramolecular Pseudorotaxanes Controlled by Acid-Base

含有吗啉的富π电子苯醚链化合物与缺π电子联吡啶环玢CPQT通过分子间的π-π堆积作用形成超分子准轮烷结构。研究发现,随着温度的变化,该准轮烷结构的相对运动速度加快,弱相互作用减弱;并进一步发现,随着酸和碱的依次加入,该准轮烷结构呈现"开"与"关"的"插销式"器件性能。

Two of complexes with pseudorotaxanes geometries have been formed in solution by π-π stacking （charge-transfer） interactions from the π-electron-rich linear phenylene ether chains containing morpholine and the π-electron- deficient （cyclophane cyclobis（paraquat-p-phenylene）, CPQT） which can be unthreaded and rethreaded by acid-base. The temperature-dependent ^1H NMR spectroscopy reveals the threading/unthreading processes.