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Ilha Hwang, Woo Sung Jeon, Hee-Joon Kim, Dongwoo Kim, Hyunuk Kim, Narayanan Selvapalam, Norifumi Fujita, Seiji Shinkai and Kimoon Kim Cucurbit[7]uril: A Simple Macrocyclic, pH-Triggered Hydrogelator Exhibiting Guest-Induced Stimuli-Responsive Behavior Angewandte Chemie International Edition 46

Version of Record online: 9 NOV 2006 | DOI: 10.1002/anie.200603149

Thumbnail image of graphical abstract

Without modification of its periphery, cucurbit[7]uril (a macrocyclic cavitand comprising seven glycoluril units) forms a hydrogel. The gelation is thermoreversible and sensitive to pH, but is inhibited by the presence of alkali-metal ions and shows guest-induced stimuli-responsive behavior: upon addition of a small amount of a guest, it undergoes a reversible gel–sol transition with alternating UV irradiation and heat treatment (see picture).

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