Department of Organic and Polymer Chemistry, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan-410083, China.
Dalton Trans. 2018 Oct 16;47(40):14227-14232. doi: 10.1039/c8dt01044g.
Host-guest complexation based on terpyridine (tpy) three-dimensional (3D) metallo-cages has received less attention due to the complicated structure and solubility issues. Herein, a three-armed metallo-organic ligand (L) was synthesized via three 120°-bent bis-tpy groups as a rigid tetrakis-tpy core, which possesses one benzo-21-crown-7 (B21C7) for further host-guest interaction. The metallo-organic cages [M3L2] with molecular weights up to 13 000 Da and giant cavities were prepared in near-quantitative yield by self-assembly of L with metal ions, such as Zn2+ and Fe2+. The 3D metallo-supramolecules were characterized and their formation was supported by NMR, DOSY, ESI-MS and TEM. Hosts [M3L2] were threaded through a difunctional alkylammonium salt by host-guest interactions to polymerize, and subsequently generate novel metallo-gels between [Zn3L2] and bis-ammonium salt (N2).
基于三吡啶（tpy）三维（3D）金属笼的主客体络合由于结构复杂和溶解度问题而受到较少关注。在此，通过三个 120°弯曲的双三吡啶基团作为刚性四三吡啶核合成了一种三臂金属有机配体（L），其具有一个苯并-21-冠-7（B21C7）以进一步进行主客体相互作用。金属有机笼[M3L2]通过 L 与金属离子（例如 Zn2+和 Fe2+）的自组装以接近定量的产率制备，分子量高达 13000 Da 且具有巨大空腔。通过 NMR、DOSY、ESI-MS 和 TEM 对 3D 金属超分子进行了表征，并支持其形成。通过主客体相互作用，主体[M3L2]穿过双官能烷基铵盐进行聚合，并随后在[Zn3L2]和双铵盐（N2）之间生成新型金属凝胶。
