pH Control on the Sequential Uptake and Release of Organic Cations by Cucurbit[7]uril
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- 作者：Lukas Mikulu ; Romana Michalicova ; Vivian Iglesias ; Dr. Mirza A. Yawer ; Prof. Angel E. Kaifer ; Prof. Premysl Lubal and Prof. Vladimir Sindelar
- 刊名：Chemistry - A European Journal
- 出版年：2017
- 出版时间：February 16, 2017
- 年：2017
- 卷：23
- 期：10
- 页码：2350-2355
- 全文大小：1313K
- ISSN：1521-3765
文摘
Cucurbit[7]uril (CB7) is a macrocycle with the ability to form the most stable supramolecular complexes in water ever reported for an artificial receptor. Its use for the design of advanced functional materials is, however, very limited because there is no example of a fully reversible CB7 based supramolecular complex enabling repetitious dissociation/association controlled by external stimuli. We report the synthesis of a new ferrocene amino acid that forms with CB7 a 1:1 inclusion complex that is stable in submicromolar concentration at low pH but dissociates at high pH. This reversible process was used for the sequential uptake and release of bispyridinium and antraquinone guests by CB7, which is controlled by adjusting the pH of the solution.