Yang Jian, Hu Shao-Jun, Cai Li-Xuan, Zhou Li-Peng, Sun Qing-Fu
State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences, Fuzhou, 350002, PR China.
University of Chinese Academy of Sciences, Beijing, 100049, PR China.
Nat Commun. 2023 Sep 28;14(1):6082. doi: 10.1038/s41467-023-41866-7.
Developing efficient adsorbents to capture radioactive iodine produced from nuclear wastes is highly desired. Here we report the facial synthesis of a hexacationic imidazolium organic cage and its iodine adsorption properties. Crucial role of counteranions has been disclosed for iodine capture with this cage, where distinct iodine capture behaviors were observed when different counteranions were used. Mechanistic investigations, especially with the X-ray crystallographic analysis of the iodine-loaded sample, allowed the direct visualization of the iodine binding modes at the molecular level. A network of multiple non-covalent interactions including hydrogen bonds, halogen bonds, anion···π interactions, electrostatic interaction between polyiodides and the hexacationic skeleton of the cage are found responsible for the observed high iodine capture performance. Our results may provide an alternative strategy to design efficient iodine adsorbents.
开发高效吸附剂以捕获核废料产生的放射性碘是非常必要的。在此，我们报道了一种六阳离子咪唑鎓有机笼的简便合成及其碘吸附性能。已揭示抗衡阴离子在该笼捕获碘中的关键作用，当使用不同抗衡阴离子时观察到了不同的碘捕获行为。机理研究，特别是对负载碘样品的X射线晶体学分析，使得能够在分子水平上直接观察碘的结合模式。发现包括氢键、卤键、阴离子···π相互作用、多碘化物与笼的六阳离子骨架之间的静电相互作用在内的多个非共价相互作用网络是观察到的高碘捕获性能的原因。我们的结果可能为设计高效碘吸附剂提供一种替代策略。
