Abstract Anion sensing properties of 3-pyrenyl-2-pyridyl-acrylonitrile 1 and its cationic methylate product 2 were investigated. Even 1 and 2 are typical D-π-A conjugated systems and possess similar molecular structure, they demonstrate distinct different selectivity toward hypochlorite (probe 1, detection limit being 3.1 nM) and bisulfite (probe 2, detection limit being 4.0 nM) with strong fluorescence enhancement. Mechanism analysis indicates that probe 1 is oxidized and then decomposed to fluorescent 1-pyrene-carboxaldehyde by hypochlorite, while nucleophilic bisulfite will selectively add to C C of probe 2 and block intramolecular charge transfer thus restore the strong fluorescence of pyrene moiety.

中文翻译：

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3-Pyrenyl-2-Pyridyl-Acrylonitrile 及其甲基化物的可辨别阴离子传感特性

摘要 研究了3-芘基-2-吡啶基-丙烯腈1及其阳离子甲基化物2的阴离子传感特性。即使 1 和 2 是典型的 D-π-A 共轭体系并具有相似的分子结构，它们对次氯酸盐（探针 1，检测限为 3.1 nM）和亚硫酸氢盐（探针 2，检测限为 4.0 nM）也表现出明显不同的选择性，具有很强的选择性。荧光增强。机理分析表明，探针1被次氯酸盐氧化后分解成荧光1-芘-甲醛，而亲核亚硫酸氢盐会选择性地加入探针2的CC并阻断分子内电荷转移从而恢复芘部分的强荧光。