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Sulfate-selective binding and sensing of a fluorescent [3]Rotaxane host system

机译:硫酸盐的选择性结合和荧光[3]轮烷宿主系统的传感

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摘要

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 guest-host 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.
机译:报道了一种新型的[3]轮烷的氯化物为模板的合成,该新的[3]轮烷能够结合阴离子客体,并引入用于荧光传感的萘基。广泛的〜1H NMR滴定研究用于探测系统的阴离子结合选择性。轮烷选择性地识别硫酸盐,在硫酸盐结合后经历诱导的构象变化,形成1:1的化学计量夹心型复合物,并伴随荧光的显着猝灭。单阴离子客体的结合导致形成2:1化学计量的客体-主体配合物,并适度增强了发射。在非竞争性溶剂中添加过量的硫酸盐也会导致2:1的发射复合物。

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