Supramolecular self-assembly of polypseudorotaxanes in ionic liquid |
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Affiliation: | 1. Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, Shandong University, Jinan 250100, PR China;2. Key Laboratory of Organosilicon and Material Technology of Ministry of Education, Hangzhou Teachers College, Hangzhou 310012, PR China |
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Abstract: | The polypseudorotaxanes (PPRs) have been prepared by supramolecular self-assembly of β-cyclodextrins (β-CDs) threaded onto the triblock copolymers (Pluronic F127) in an ionic liquid [1-n-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6)] with two different manners. Structural characterizations of the assembled PPRs are carried out in detail respectively with XRD, 13C CP/MAS NMR, 1H NMR and DSC techniques. The results obtained indicate a channel-type crystalline structure for such produced inclusion complexes (ICs). Which one will finally be included inside β-CD, F127 or bmimPF6, is related to the ethanol amount around the initially β-CD/bmimPF6 ICs. At higher ethanol concentration, F127 may squeeze bmimPF6 molecules out from β-CD and thread themselves instead into the cavity of β-CD and finally precipitate with more CDs being stacked. |
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