期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 18, 期 45, 页码 14406-14412出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201202204
关键词
anions; fluorescence; molecular recognition; rotaxanes; supramolecular chemistry
资金
- EPSRC
The chloride-templated synthesis of a novel [3]rotaxane, capable of binding anionic guests, and incorporating a naphthalene group for fluorescence sensing is reported. Extensive 1H NMR titration studies were used to probe the anion binding selectivity of the system. The rotaxane selectively recognises sulfate, undergoing an induced conformational change upon sulfate binding to form a 1:1 stoichiometric sandwich-type complex, concomitant with significant quenching of the fluorescence. Binding of mono-anionic guests results in the formation of a 2:1 stoichiometric guesthost complex, and a modest enhancement of the emission. Addition of an excess of sulfate in non-competitive solvent also results in a 2:1 emissive complex.
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