摘要/Abstract

合成了一种新型的荧光化学传感器(E)-N'-(3-((双(吡啶-2-亚甲基)氨基)甲基)-2-羟基-5-甲基亚苄基)-7-(二乙氨基)-2-氧代-2H-色烯-3-甲酰肼(1), 并通过¹H NMR、¹³C NMR和ESI-MS对其结构进行表征, 利用紫外/荧光分光光度法研究了传感器1的传感性能. 结果表明: 传感器1于水中对Al³⁺表现出明显的荧光增强响应, 而配合物1-Al³⁺对PPi表现出明显的荧光淬灭响应. 传感器1对Al³⁺和焦磷酸根(PPi)的检测限分别为0.26和0.1 μmol/L, 配位比均为1∶1. 配位机理通过荧光滴定、核磁滴定和高分辨质谱进行了证实, 另外传感器 1的有效测试pH范围是2~10, 且循环响应测试可达4次.
关键词: 香豆素, 荧光化学传感器, Al³⁺, PPi, 连续识别
A novel fluorescent chemosensor (E)-N'-(3-((bis(pyridin-2-ylmethyl)amino)methyl)-2-hydroxy-5-methylbenzyl- idene)-7-(diethylamino)-2-oxo-2H-chromene-3-carbohydrazide (1) has been synthesized and showed an obviously “off-on-off” fluorescence response toward Al ³⁺ and pyrophosphate (PPi) in aqueous solution. The detection limits of sensor 1 were 0.26 μmol/L to Al ³⁺ and 0.1 μmol/L to PPi, and the binding stoichiometry was 1∶1. In addition, the binding mechanism was further confirmed by fluorescence titration, nuclear magnetic titration and ESI-MS. The effective determination pH range for Al ³⁺ and PPi was from 2 to 10, and the cycle response test could reach 4 times.
Key words: coumarin, fluorescent chemosensor, Al³⁺, PPi, sequential recognition


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