基于萘酰亚胺-苯并咪唑鎓的荧光传感器对H2PO-4的高选择性识别

doi:10.11944/j.issn.1000-0518.2020.07.200004

摘要/Abstract

摘要： 设计合成了基于萘酰亚胺-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对阴离子F^-、Cl^-、Br^-、I^-、AcO^-、HSO^-₄、H₂PO^-₄、NO^-₃、ClO^-₄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H₂PO^-₄时,受体分子1的荧光猝灭率高达98%,受体分子2的荧光猝灭率仅为24%。表明具有多重识别位点的受体分子1在构型上与H₂PO^-₄更匹配,可作为H₂PO^-₄的荧光关闭型(turn-off)探针。受体分子1与H₂PO^-₄的结合比为1∶1,结合常数为(1.25±0.11)×10⁵ L/mol,检出限为6.90×10^-6 mol/L。

关键词: 苯并咪唑鎓, 萘酰亚胺, H₂PO^-₄, 荧光传感器

Abstract: Two novel naphthalimide-benzimidazolium based receptors 1 and 2 were synthesized. The anion (F^-, Cl^-, Br^-, I^-, CH₃COO^-, HSO^-₄, H₂PO^-₄, ClO^-₄, NO^-₃) binding properties of two receptors were evaluated in CH₃CN by fluorescence spectroscopy. Two receptors display fluorescent quenching effect with H₂PO^-₄ and the quench percentages for receptors 1 and 2 are 98%and 24%, respectively. The results indicate that receptor 1 is more closely matched to H₂PO^-₄ in configuration, and receptor 1 behaves as a “turn-off” fluorescence sensor for H₂PO^-₄. Job-plot shows that receptor 1 and H₂PO^-₄ form a 1∶1 complex, and the binding constant is (1.25±0.11)×10⁵ L/mol, the detection limit is 6.90×10^-6 mol/L.

Key words: benzimidazolium, naphthalimide, H₂PO^-₄, fluorescent sensor

董智云, 刘洋, 王迎进, 赵三虎, 席福贵. 基于萘酰亚胺-苯并咪唑鎓的荧光传感器对H₂PO^-₄的高选择性识别[J]. 应用化学, 2020, 37(7): 839-846.

DONG Zhiyun, LIU Yang, WANG Yingjin, ZHAO Sanhu, XI Fugui. Naphthalimide-Benzimidazolium Based Fluorescent Chemosensor for Highly Selective Recogniton of H₂PO^-₄[J]. Chinese Journal of Applied Chemistry, 2020, 37(7): 839-846.

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基于萘酰亚胺-苯并咪唑鎓的荧光传感器对H₂PO^-₄的高选择性识别

Naphthalimide-Benzimidazolium Based Fluorescent Chemosensor for Highly Selective Recogniton of H₂PO^-₄

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