A unique supramolecular approach of preparing and using a cucurbit[8]uril (Q[8])-based dynamic host–guest assembly for cyanide sensing in and removal from water has been successfully developed. The dicyanovinyl-attached cationic guest (1) was designed as the fluorescent response moiety for the detection of the cyanide anion via a nucleophilic addition reaction in the assist of the Q[8]-based 2:2 quaternary complexes. Furthermore, the reaction of cyanide with 1 further switched the Q[8]-based host–guest assemblies from the 2:2 complexes to the 1:1 supramolecular polymers that precipitate in water. Thus, the macrocyclic-based dynamic host–guest assembly has potential use in applications for solving the problem of toxic anion pollutants present in aqueous environments.

中文翻译：

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葫芦[8]脲辅助亲核反应：一种独特的超分子方法，用于检测和去除水溶液中的氰化物

已经成功开发了一种独特的超分子方法，该方法可以制备和使用基于葫芦 [8] 脲 (Q[8]) 的动态主客体组件来检测水中的氰化物和从水中去除。连接双氰基乙烯基的阳离子客体 ( 1 ) 被设计为荧光响应部分，用于通过亲核加成反应在基于 Q[8] 的 2:2 四元配合物的帮助下检测氰化物阴离子。此外，氰化物与1的反应进一步将基于 Q[8] 的主客体组件从 2:2 复合物转变为在水中沉淀的 1:1 超分子聚合物。因此，基于大环的动态主客体组装在解决水性环境中存在的有毒阴离子污染物问题的应用中具有潜在用途。