Abstract Quinolinecarboxamides based on coumarin derivatives were efficiently synthesized and the optical properties were investigated. Compound ZXQ substituted by the diethylamino group on 7-position of coumarin exhibited blue fluorescence (λem ≈ 470 nm) with a high fluorescence quantum yield of 0.92 in Toluene and showed “turn-off” fluorescence property for Al3+. Probe ZXQ formed the 2:1 complex with Al3+ and performed fluorescence quenching in MeCN/H2O (95:5), which exhibited good selectivity and sensitivity. In addition, the mechanism of binding and fluorescence quenching was illustrated by titration experiment, Job’ plot and DFT calculations.

中文翻译：

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基于喹啉甲酰胺-香豆素的新型“关闭”荧光传感器用于 Al3+ 检测

摘要 高效合成了基于香豆素衍生物的喹啉甲酰胺，并对其光学性质进行了研究。香豆素7位二乙氨基取代的化合物ZXQ在甲苯中显示蓝色荧光（λem≈470 nm），荧光量子产率为0.92，对Al3+显示“关闭”荧光特性。Probe ZXQ 与 Al3+ 形成 2:1 络合物，并在 MeCN/H2O (95:5) 中进行荧光猝灭，表现出良好的选择性和灵敏度。此外，通过滴定实验、Job'图和DFT计算说明了结合和荧光猝灭的机制。