A novel pseudorotaxane (BVCB) was synthesized by supramolecular self-assembly of cucurbi-turil[6] (CB[6]) with butyl viologen (N,N'-bi-n-butyl-4,4'-bipyridinium dibromide, BV) in water at room temperature. The chemical structure of BVCB was confirmed by elemental analysis, ¹H NMR, MS and IR spectra. CB[6] beads were localized on aliphatic chain to combine N^＋of BV by non-covalent bonds, and the molar ratio of CB[6] to BV was 2∶1. Properties of BVCB were investigated by thermogravimetry analysis (TGA), UV-vis measurements and chemical reduction, and the results show that BVCB has higher thermal stability, stronger absorption band and higher oxidation ability than BV. The effect of salts on BVCB was studied by the transmittance with UV-vis, and the result shows that NaI is the precipitant to VBCB. The microscopical morphology of BV and BVCB was studied by environment scanning electron microscope, and the results show that BVCB has higher rigidity and lower crystallizability than BV.

Key words: viologen, cucurbituril[6], supramolecule, pseudorotaxane