Polypseudorotaxane Constructed from Pillar[5]arene and Viologen Polymer

A novel polypseudorotaxane constructed from pillar[5]arene as the cyclic rings and viologen polymer as the polymeric chain has been reported. 1H NMR measurements were used to determine the average number of repeating units from the peak integration ration of the viologen proton peak to the proton peak from the end-group. The peaks of the viologen and the methylene moieties showed a shift, thus the shuttling movement of pillar[5]arene along the polymer axis was fast on the NMR time scale. The small peak shifts from the viologen and the methylene moieties around the N atoms were observed by using VP-3 as the polymer axis. The values of the peak shift were gradually increased with pillar[5]arene in viologen polymer (VP-3) that showed that the interaction of pillar[5]arene with VP-8 was stronger than with VP-3.