We report the supramolecular self-assembly of cucurbit[8]uril(Q[8]) and 1-(4-methoxyphenyl)piperazine inclusion complex. The complex is cultured in 3 M hydrochloric acid solution under CdCl2 induction conditions to obtain a new crystal, the structure of which was characterized by X-ray single-crystal diffraction. The results show that the crystal belongs to the monoclinic crystal system with a C2/m space group. The host–guest interaction ratio of Q[8] and 1-(4-methoxyphenyl) piperazine is 1:2.

Dicyclopentyl substituted cucurbit[6]uril (CyP 2 Q[6]) is used to construct supramolecular self-assembly with Ca and Er ions, respectively, and the obtained crystals are characterized by the X-ray single crystal diffraction technique, with results showing that two Ca 2+ form coordination bonds with two CyP 2 Q[6] carbonyl oxygen atoms and ten water molecules, respectively, while Er 3+ first coordinates with eight water molecules and then forms hydrogen bonds through the coordinated water with the portal carbonyl oxygen on the CyP 2 Q[6], thus forming a 1D supramolecular chain, and a honeycomb-like framework between two adjacent CyP 2 Q[6] through [ZnCl 4 ] 2-.