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Acid/Base‐ and Anion‐Controllable Organogels Formed From a Urea‐Based Molecular Switch
Author(s) -
Hsueh ShengYao,
Kuo ChunTing,
Lu TsanWen,
Lai ChienChen,
Liu YiHung,
Hsu HsiuFu,
Peng ShieMing,
Chen Chunhsien,
Chiu ShengHsien
Publication year - 2010
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201004090
Subject(s) - rotaxane , urea , hydrogen bond , ethylene glycol , chemistry , solvent , catenane , base (topology) , polymer chemistry , ion , organic base , photochemistry , molecule , organic chemistry , supramolecular chemistry , mathematical analysis , mathematics
A switch in time : Gel–sol transitions of a urea‐based [2]rotaxane gelator are controlled by the degree of solvent exposure of the hydrogen‐bond‐donating urea station and the orientation of the hydrogen‐bond‐accepting CO groups of the interlocked ethylene glycol based macrocycle (N blue, O and macrocycle red, phenyl green). Both acid/base and anion‐exchange control can be used to reversibly transition the rotaxane in 1‐pentanol between solution and gel states.