MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 102488, P.R. China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P.R. China.
Chemistry. 2019 Mar 15;25(16):4136-4142. doi: 10.1002/chem.201805455. Epub 2019 Feb 18.
A flexible bipyridinium-linker-based porous host framework with electron-accepting pore surface, namely, [Zn (L)(pmc) ]⋅12 H O (1; L⋅Cl =1,1'-[1,4-phenylene-bis(methylene)]bis(4,4'-bipyridinium) dichloride, H pmc=pyromellitic acid) exhibits recognition of phenol and aromatic amine guests based on adsorbent-adsorbate charge-transfer interactions. Significantly, the resultant guest-encapsulated complexes 1@Guests can all be characterized by single-crystal X-ray diffraction. The host framework undergoes a reversible single crystal-to-single crystal transformation in response to the inclusion of different guests with flexible torsional motions of the hexagonal ring and the trapezoid-shaped bipyridinium groups. Such recognition can be visibly monitored and detected by obvious color changes. The host framework could also be recovered, and this suggested that guest sorption/desorption is reversible and that the host framework could be reused in potential applications. This work may provide an effective way to develop porous materials with special emphasis on applications involving guest recognition.
一种具有电子接受型孔表面的灵活联吡啶连接基多孔主体框架，即[Zn（L）（pmc）]·12H 2 O（1；L·Cl=1,1'-[1,4-亚苯基-双（亚甲基）]双（4,4'-联吡啶）二氯化物，H pmc=均苯四甲酸），基于吸附剂-吸附物电荷转移相互作用，表现出对苯酚和芳香胺客体的识别。显著的是，所得的客体包封配合物 1@Guests 都可以通过单晶 X 射线衍射来表征。主体框架通过包含不同的客体而经历可逆的单晶到单晶的转变，具有六边形环和梯形联吡啶基团的灵活扭转运动。这种识别可以通过明显的颜色变化来进行可见的监测和检测。主体框架也可以被回收，这表明客体的吸附/解吸是可逆的，并且主体框架可以在潜在的应用中重复使用。这项工作可能为开发具有特殊强调客体识别应用的多孔材料提供了一种有效的方法。
