对Fe3+和草酸具有荧光“关-开”功能的喹啉衍生物
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国家自然科学基金项目(面上项目)


Quinoline derivative with fluorescent ‘off-on’ function for Fe3 and oxalic acid
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The National Natural Science Foundation of China (General Program)

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    摘要:

    通过8-羟基喹啉-2-甲醛与水杨酰肼的缩合反应,合成了一种喹啉席夫碱衍生物荧光分子探针(L)。经FT-IR、1H NMR、13C NMR、ESI-MS表征,确定了探针L的分子结构。利用吸收和荧光光谱研究了探针L的识别性能。在DMSO溶液中,探针L与Fe3+能够形成1:1型配合物L-Fe,表观结合常数为4.6 × 104 L/mol。利用该配合物的形成导致的探针荧光猝灭,能够在常见金属离子中高选择性识别Fe3+,检出限为6.8 × 10-8 mol/L。进一步以L-Fe复合物为探针,实现了对草酸的高选择性荧光增强识别,检出限为1.3 × 10-7 mol/L。该方法可用于蔬菜中草酸的检测。

    Abstract:

    A fluorescent molecular probe (L) based quinoline schiff base was synthesized by the condensation reaction of 8-hydroxyquinoline-2-carboxaldehyde and salicylhydrazide. The molecular structure of the probe L was determined by FT-IR, 1H NMR, 13C NMR and ESI-MS. The recognition performance of probe L was studied by absorption and fluorescence spectra in DMSO solution. The probe L and Fe3+ could form a 1: 1 complex L-Fe, which binding constant is 4.6*104 L/mol. Through the quenching of probe fluorescence caused by the formation of the above complexes, Fe3+ could be selectively recognized in common metal ions, and the detection limit is 6.8* 10-8 mol/L. Furthermore, the L-Fe complex was used as a probe to achieve highly selective fluorescence enhanced recognition of oxalic acid, and the detection limit is 1.3*10-7 mol/L. This method could be used to detect oxalic acid in vegetables samples.

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郭祥峰,高欣,贾丽华,杨瑞,王金平,赵振龙.对Fe3+和草酸具有荧光“关-开”功能的喹啉衍生物[J].精细化工,2020,37(10):0

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  • 收稿日期:2020-04-05
  • 最后修改日期:2020-05-16
  • 录用日期:2020-05-16
  • 在线发布日期: 2020-08-05
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