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From Supramolecular Organic Cages to Porous Covalent Organic Frameworks for Enhancing Iodine Adsorption Capability by Fully Exposed Nitrogen-Rich Sites
Small ( IF 13.0 ) Pub Date : 2023-05-10 , DOI: 10.1002/smll.202301998 Ke Cheng 1 , Hailian Li 1 , Jia-Rui Wang 1 , Pei-Zhou Li 1, 2 , Yanli Zhao 2
Small ( IF 13.0 ) Pub Date : 2023-05-10 , DOI: 10.1002/smll.202301998 Ke Cheng 1 , Hailian Li 1 , Jia-Rui Wang 1 , Pei-Zhou Li 1, 2 , Yanli Zhao 2
Affiliation
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In order to overcome the limitations of supramolecular organic cages for their incomplete accessibility of active sites in the solid state and uneasy recyclability in liquid solution, herein a nitrogen-rich organic cage is rationally linked into framework systems and four isoreticular covalent organic frameworks (COFs), that is, Cage-TFB-COF, Cage-NTBA-COF, Cage-TFPB-COF, and Cage-TFPT-COF, are successfully synthesized. Structure determination reveals that they are all high-quality crystalline materials derived from the eclipsed packing of related isoreticular two-dimensional frameworks. Since the nitrogen-rich sites usually have a high affinity toward iodine species, iodine adsorption investigations are carried out and the results show that all of them display an enhancement in iodine adsorption capacities. Especially, Cage-NTBA-COF exhibits an iodine adsorption capacity of 304 wt%, 14-fold higher than the solid sample packed from the cage itself. The strong interactions between the nitrogen-rich sites and the adsorbed iodine species are revealed by spectral analyses. This work demonstrates that, utilizing the reticular chemistry strategy to extend the close-packed supramolecular organic cages into crystalline porous framework solids, their inherent properties can be greatly exploited for targeted applications.
中文翻译：
从超分子有机笼到多孔共价有机框架，通过完全暴露的富氮位点增强碘吸附能力
为了克服超分子有机笼在固态下活性位点不完全可及性和在液体溶液中不易回收的局限性，本文将富氮有机笼合理地连接成框架系统和四个等网状共价有机框架（COF）成功合成了Cage-TFB-COF、Cage-NTBA-COF、Cage-TFPB-COF、Cage-TFPT-COF。结构测定表明它们都是源自相关等网状二维框架重叠堆积的高质量晶体材料。由于富氮位点通常对碘物种具有高亲和力，因此进行了碘吸附研究，结果表明它们都显示出碘吸附能力的增强。特别是，Cage-NTBA-COF 的碘吸附能力为 304 wt%，比笼本身填充的固体样品高 14 倍。光谱分析揭示了富氮位点和吸附的碘物质之间的强烈相互作用。这项工作表明，利用网状化学策略将密堆积超分子有机笼延伸到结晶多孔骨架固体中，可以极大地利用其固有特性用于目标应用。
更新日期：2023-05-10
中文翻译：
从超分子有机笼到多孔共价有机框架，通过完全暴露的富氮位点增强碘吸附能力
为了克服超分子有机笼在固态下活性位点不完全可及性和在液体溶液中不易回收的局限性，本文将富氮有机笼合理地连接成框架系统和四个等网状共价有机框架（COF）成功合成了Cage-TFB-COF、Cage-NTBA-COF、Cage-TFPB-COF、Cage-TFPT-COF。结构测定表明它们都是源自相关等网状二维框架重叠堆积的高质量晶体材料。由于富氮位点通常对碘物种具有高亲和力，因此进行了碘吸附研究，结果表明它们都显示出碘吸附能力的增强。特别是，Cage-NTBA-COF 的碘吸附能力为 304 wt%，比笼本身填充的固体样品高 14 倍。光谱分析揭示了富氮位点和吸附的碘物质之间的强烈相互作用。这项工作表明，利用网状化学策略将密堆积超分子有机笼延伸到结晶多孔骨架固体中，可以极大地利用其固有特性用于目标应用。
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