Two inclusion complexes formed on self-assembly of the Q[8] host with dihexyl-4,4′-bipyridinium (HV2+) dibromide and 1,3-bis(4-butylpiperazin-1-yl)-propane (C3PA2+) dibromide guests have been characterized by X-ray crystallography, which clearly shows how the hosts and the guests interlock with each other using supramolecular interactions, eventually generating novel polypseudorotaxanes.
![Graphical abstract: Self-assembly of cucurbit[8]uril-based polypseudorotaxanes using host–guest interactions](http://hg.y866.cn/compound/lib/scimg/usr/1/C4RA08636H.jpg)
