A novel heteroditopic ion-pair receptor was synthesized by tethering two π-acidic naphthalenediimide units with a tridentate bisimine linker. Upon chelating a Zn^II or Cd^II ion with the linker, it adopts a U-conformation allowing the parallel NDI arms to sandwich charge-diffuse anions, and two such folded receptor molecules interlock with each other forming an [R3·M^II·R3·X^–] ion-pair complex. Extraction of the guest cation with a tetraazacrown ether returns the receptor to its original unfolded form.

中文翻译：

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阳离子辅助的基于萘二甲酰亚胺的对位离子对受体的可逆折叠和阴离子结合。

通过将两个π-酸性萘二酰亚胺单元与一个三齿双亚胺连接基连接在一起，合成了一种新型的异位离子对受体。与连接子螯合Zn ^II或Cd ^II离子时，它采用U构型，允许平行的NDI臂将电荷扩散阴离子夹在中间，两个折叠的受体分子彼此互锁，形成[ R3 ·M ^II · R3 ·X ^– ]离子对络合物。用四氮杂row醚提取客体阳离子可使受体恢复其原始的未折叠形式。