Abstract: A series of N,N’-bisalkyl-1,3-(4,4’-bispyridyl)propane guests were synthesized from 1,3-(4,4’-bispyridyl)propane. The interaction and the models of self-assembly psedorotaxanes of cucurbit[7] uril with these synthetic guests were investigated via ¹H NMR technique and electronic absorption spectroscopy method. The experimental results reveal that the pseudorotaxane structure in which the host Q[7] included the 1,3-(4,4’-bispyridyl)propane core was the dominant model for the Q[7]-PC0 and Q[7]-PC2 interaction systems. For the guests having identical aliphatic substituents with chains longer than four carbon atoms, the dominant interaction models could start from Q[7] including the 1,3-(4,4’-bispyridyl)propane core, to including the substituted chains of the guest, and then a guest bearing three host Q[7] with the increase of the ratio of N_Q[7]/N_guest.

Key words: Cucurbit[7] uril, 1,3-(4,4’-Bispyridyl)propane and its derivative, Interaction model, ¹H NMR technique, UV absorption spectroscopy