Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (7): 839-846.DOI: 10.11944/j.issn.1000-0518.2020.07.200004

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

DONG Zhiyun, LIU Yang, WANG Yingjin, ZHAO Sanhu, XI Fugui*   

  1. Department of Chemistry,Xinzhou Teachers University,Xinzhou,Shanxi 034000,China
  • Received:2020-01-02 Published:2020-07-01 Online:2020-07-07
  • Contact: XI Fugui, lecturer; Tel/Fax:0350-3339205; E-mail:xifuguig@163.com; Research interests:synthesis and design of function materials
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21701137), and the Shanxi “1331 Project” Key Subjects Construction(2019)

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