and fully converted to benzimidazolium. Mechanical threading of [24]crown-8 ether wheels onto recognition sites to form pseudorotaxanes was evidenced by solution nuclear magnetic resonance, solid-state fluorescence, and infrared spectroscopy. Selective absorption of [24]crown-8 ether rather than its dibenzo counterpart was also observed. Further study reveals that this binding process is reversible and
构建了一种前所未有的具有 T 形
苯并咪唑支柱的
锆金属有机框架,并将其用作海绵状材料,用于选择性吸收大环客体。所合成框架的中性
苯并咪唑结构域可以很容易地质子化并完全转化为
苯并咪唑鎓。溶液核磁共振、固态荧光和红外光谱证明了将 [24]crown-8 醚轮机械拧入识别位点以形成伪轮烷。还观察到[24]crown-8 醚而不是其二苯并对应物的选择性吸收。进一步的研究表明,这种结合过程是可逆的并且是酸碱可转换的。晶体中大环客体的对接成功主客体相互作用为具有互穿结构的复杂功能材料提供了替代途径。