基于蒽-苯并咪唑鎓的荧光传感器对H2PO4-的高选择性识别

设计合成了基于蒽-苯并咪唑鎓的受体分子1和2,通过荧光发射光谱研究了受体分子1和2对F^-、Cl^-、Br^-、I^-、AcO^-、HSO₄^-、H₂PO₄^-、NO₃^-、ClO₄^-等阴离子的识别性能。 研究发现,在受体分子1和2的乙腈溶液(5.0×10^-6 mol/L)中加入10倍化学计量的H₂PO₄^-时,受体分子1的荧光猝灭百分数为13%,受体分子2的荧光猝灭百分数高达94%,表明受体分子2在构型上与H₂PO₄^-更匹配,可作为H₂PO₄^-的荧光关闭型(turn-off)探针。 受体分子2与H₂PO₄^-的结合比为1:1,结合常数为(3.70±0.16)×10⁴ L/mol,检出限为3.77×10^-6 mol/L。

Anthracene-Benzimidazolium Based Fluorescent Chemosensor for Highly Selective Recogniton of H2PO4-

Two novel anthracene-benzimidazolium based receptors 1 and 2 were synthesized.The anion(F^-,Cl^-,Br^-,I^-,AcO^-,HSO4^-,H2PO4^-,ClO4^-,NO3^-)binding properties of receptors 1 and 2 were evaluated in acetonitrile by fluorescence spectroscopy.The receptors 1 and 2 display fluorescent quenching effect with H2PO4^-,the quench percentage for receptor 1 is 13%,and for receptor 2 is as much as 94%.The results indicate that receptor 2 is more closely matched to H2PO4^- in configuration,and receptor 2 can behave as a“turn-off”fluorescence sensor for H2PO4^-.Job-plot shows that receptor 2 and H2PO4^- form a 1∶1 complex,the binding constant is(3.70±0.16)×10^4 L/mol,and the detection limit is 3.77×10^-6 mol/L.