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Complex Formation of Cyclodextrins with Cationic Polymers

Abstractα-Cyclodextrin (α-CD) was found to form inclusion complexes with viologen polymers (VP) having octamethylene groups [poly(paraquat-octamethylene)] and longer methylene chains in aqueous solution. The 1H NMR spectra of VP in the presence of α-CD showed that the methylene peaks and peaks of viologen at the polymer end split in two and that the protons on the bipyridinium ring on the main chain shifted toward downfield. Changes of the 1H NMR spectra are time-dependent. It took longer to reach equilibrium as the number of methylene groups increased. The association constant of the complex between α-CD and VP was estimated to be 100 M−1. α-CD did not form complexes with VP with hexamethylene groups. β-CD formed complexes with VP having decamethylene groups and longer methylene chains. The complex formation of β-CD with VPs is faster than that of α-CD with VP. γ-CD formed complexes with ionene polymers (IP), {poly[(dimethylimino)alkylene]dibromide} such as 3,6-ionene and 6,8-ionene to give compounds in the solid state.