1H NMR titration study of stimuli-responsive supramolecular assemblies: inclusion complexes between PEG–b-PEI copolymer-grafted dextran and naphthalene-appended γ-cyclodextrin via double-strand inclusion |
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| Authors: | Yoon-Ki Joung Hak Soo Choi Tooru Ooya Nobuhiko Yui |
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| Institution: | (1) School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1, Asahidai, Nomi Ishikawa, 923-1292, Japan |
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| Abstract: | We have previously prepared a stimuli-responsive inclusion complex between PEG–b-PEI–g-dextran graft copolymer (PEG–PEI–dex) and γ-cyclodextrin (γ-CD) in order to investigate unique inclusion phenomena, double-axle
inclusion. For further study, a γ-CD derivative, mono-6-O-(2-sulfonato-6-naphthyl)-γ-CD (SN-γ-CD) was additionally synthesized for 1H NMR titration study, which is expected to induce the competition of pendant naphthyl group with external polymer guests.
Consequently, 1H NMR titration results of the inclusion complex of PEG–PEI–dex with SN-γ-CD showed stoichiometric changes, temperature-dependence,
and reversibly pH-responsive properties of the inclusion complexes in terms of chemical shift variation. |
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| Keywords: | Cyclodextrin Diblock copolymer 1H NMR titration Inclusion complex Stimuli-responsive network Double-strand inclusion |
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