Acyl-anchored metal-organic cages with interior cryptand-like recognition sites for selective removal of radioactive strontium(Ⅱ)  

具有类穴醚识别位点的酰基修饰金属有机笼用于选择性去除放射性锶(Ⅱ)

作　　者：Wei Jin Qunyan Wu Yan Lou Zhiwei Huang Feng Liu Bowen Hu Jipan Yu Kongqiu Hu Liyong Yuan Weiqun Shi Lei Mei 晋维;吴群燕;娄妍;黄志伟;刘峰;胡博文;于吉攀;胡孔球;袁立永;石伟群;梅雷

机构地区：[1]College of Nuclear Science and Technology,Harbin Engineering University,Harbin 150001,China [2]Laboratory of Nuclear Energy Chemistry,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Science Bulletin》2025年第5期683-693,共11页科学通报(英文版)

基　　金：National Natural Science Foundation of China(22122609,22076186 and U20B2019);NationalScienceFund for Distinguished Young Scholars(21925603).

摘　　要：Tailored design of organic linkers or metal nodes can introduce desirable functionalities into metal-organic cages(MOCs),significantly expanding their potential applications.In this study,we present a viable approach for engineering acyl-type metal nodes to create interior oxygen-rich sites within MOCs,enabling specific recognition of metal ions,including radioactive contaminants,while maintaining the structural integrity of the MOCs.A novel MOC featuring a uranyl-sealed calix[4]resorcinarene(C[4]R)-based multisite cavity,referred to as UOC,is synthesized as a prototype.In UOC,peroxide-bridged dimeric uranyl units at both ends of the coordination cage provide abundant oxygen sites for coordination,forming a cryptand-like cavity that facilitates efficient recognition and encapsulation of Sr2+due to the size-matching effect.Additionally,hydrophobic binding cavities at both ends of UOC promote the co-inclusion of two different guest species.Inspired by the strong binding affinity of UOC for Sr2+,it is employed as a solid adsorbent for capturing low concentrations of Sr2+in strontium-contaminated simulated groundwater.A removal efficiency of 99.7%for Sr2+at an initial concentration as low as 0.013 mmol L−1 is achieved,demonstrating its significant potential for the selective removal of trace amounts of radioactive 90Sr2+.This work demonstrates the feasibility of incorporating acyl-type metal nodes into MOCs for the recognition and encapsulation of metal ions,offering a novel strategy for developing new MOC-based functional materials.

关 键 词：Metal-organic cages Supramolecular recognition Node engineering Radioactive strontium Selective removal 

分 类 号：O62[理学—有机化学]