Probing Cucurbituril Assemblies in Water with TEMPO-like Nitroxides: A Trinitroxide Supraradical with Spin−Spin Interactions
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- 作者：David Bardelang ; Karol Banaszak ; Hakim Karoui ; Antal Rockenbauer ; Mlanie Waite ; Konstantin Udachin ; John A. Ripmeester ; Christopher I. Ratcliffe ; Olivier Ouari ; Paul Tordo
- 刊名：Journal of the American Chemical Society
- 出版年：2009
- 出版时间：April 22, 2009
- 年：2009
- 卷：131
- 期：15
- 页码：5402-5404
- 全文大小：177K
- 年卷期：v.131,no.15(April 22, 2009)
- ISSN：1520-5126
文摘
Nitroxide free radicals are demonstrated to be useful guests for probing cucurbit[n]uril (CB[n]) assemblies in water by EPR spectroscopy. CB[7] and CB[8] significantly aggregate either in solution or in the solid state (as evidenced by a single-crystal X-ray structure in which CB[8] forms supramolecular triangles with 4-methoxy-TEMPO). The included nitroxides show a striking resistance to biologically relevant reduction, benefiting from the carcerand effect of CB[7] and CB[8] solutions.