Cucurbit6uril-Based Supramolecular Assemblies: Possible Application in Radioactive Cesium Cation Capture

Multidimensional supramolecular assemblies based on cucurbitnuril (n = 6 or 7) were constructed via the outer-surface interactions of cucurbitnurils with the polyaromatic compound 4,4',4″-benzene-1,3,5-triyl-tribenzoate as a structure-directing agent. Most impressively, the cucurbit6uril-based assembly exhibits high selectivity for capture of cesium cations among the common alkali metal ions in a basic medium and releases the cesium cations under acidic conditions. This reversible process enables possible applications in cesium cation capture.