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Hetero type III-B rotaxane dendrimers
Authors:Chak-Shing Kwan  Ken Cham-Fai Leung
Institution:Department of Chemistry, The Hong Kong Baptist University, Kowloon, Hong Kong SAR, P. R. China
Abstract:Type III-B rotaxane dendrimer is a member of the rotaxane dendrimer family, but it is defined as dendritic polyrotaxane, branched through rings. Such rotaxane dendrimers have been synthesized through versatile copper-catalyzed azide-alkyne cycloaddition reactions. In order to incorporate more functionalities into type III-B rotaxane dendrimers, three different potential functionalities—azobenzene toward light switch, daisy chain toward higher degree of contraction, and extension and cyclobis (paraquat-p-phenylene) (CBPQT) toward redox chemistry—were combined into the original design of type III-B rotaxane dendrimers. Two azo-based G1/G2 and four new G1 and G2 hetero type III-B rotaxane dendrimers were synthesized and characterized by 1H NMR spectroscopy and electrospray ionization mass spectrometry.
Keywords:azobenzene  daisy chain  dendrimer  paraquat  rotaxane
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