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In this work, we reported a porous supramolecular framework (A) constructed of a symmetric tetramethylcucurbit[6]uril (TMeQ[6]) in aqueous HCl solutions; the driving force was the outer surface interaction of cucurbit[n]urils, as well as hydrogen bonding between latticed water molecules and portal carbonyl oxygens of TMeQ[6]. Adsorption experimental results revealed that the porous supramolecular framework can absorb certain fluorophore guests (FGs) to form luminescent assemblies (FG@As) by fluorescence enhancement or colour change, and some of them can respond to certain volatile organic compounds. Thus, the TMeQ[6]-based supramolecular framework could be used as a sensor for certain gas or volatile compounds.

TMeQ[6] exhibits high selectivity for [PdCl 4 ] 2− anion in an HCl solution to form supramolecular frameworks via the anion-induced outer-surface interactions of cucurbit[n]urils. However, in an HNO 3 solution, TMeQ[6] can only form metal free supramolecular frameworks via the self-induced outer-surface interactions of cucurbit[n]urils. Using these properties, a process for collecting and recovering precious palladium could be established.

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