Loose-Fit Polyrotaxane Composed of gamma-Cyclodextrin and Single Poly(Ethyelene Glycol) Chain: Making Room in gamma-CD Cavity for Additional Inclusion Complexation

摘要

Cyclodextrin (CD)-based inclusion complexes have been paid much attention in the last decades for their potential as supermolecules,1,2 in which CD molecules are assembled onto the linear polymeric guest molecules with a suitable size so as to fill the cavity.3 It isworthmentioning that γ-CDhas been reported to include two chains of linear polymeric guest such as poly(ethylene glycol) (PEG), although R-CD forms a single-stranded inclusion complex with such a polymeric chain.4 Because it is easily imagined that a structure of single-stranded inclusion complexes is unambiguous, they are important precursors for the endcapping reaction at the terminals of polymeric chain with bulky molecules to give polyrotaxanes.