A simple construction of a rotaxane and pseudorotaxane: Syntheses and X-ray crystal structures of cucurbituril threaded on substituted spermine

A simple, one-step, high-yield synthesis of a rotaxane and pseudorotaxane based on cucurbituril and spermine is presented. Various spectroscopic techniques and X-ray diffraction methods were used to characterize the supramolecular species.open1173sciescopu