Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (10): 1256-1263.DOI: 10.11944/j.issn.1000-0518.2018.10.170360

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Synthesis, Structure and Fluorescence Effects of Pyrazole-Pyridine Europium Complex

WANG Yu,ZHANG Lijing,WANG Ying,BAI Fengying(),XING Yongheng   

  1. College of Chemical Engineering,Liaoning Normal University,Dalian,Liaoning 116029,China
  • Received:2017-10-11 Accepted:2018-01-08 Online:2018-10-01 Published:2018-10-09
  • Contact: BAI Fengying
  • Supported by:
    Supported by National Natural Science Foundation of China(No.21571091)

Abstract:

A new complex Eu(L)(MeOH)(NO3)3 was designed and synthesized under the hydrothermal reaction condition using Eu(NO3)3·6H2O as the metal source and 2,6-bis(5-phenyl-1H-pyrazol-3-yl) pyridine(L) as the ligand, and characterized by elemental analysis, infrared spectra, thermogravimetric analysis, X-ray powder diffraction and X-ray single crystal diffraction. The structural analysis shows that the central metal of complex is nine-coordinated and each of the central metal europium atoms is coordinated with three nitrogen atoms from L, six oxygen atoms from NO3- ions and MeOH to form a slightly distorted three-cap triangular prismatic spatial configuration. It is found that the complex has a strong fluorescence quenching effect on copper and nickel ions. The presence of other competing metal ions does not interfere with selective detection of Cu2+ by the complex, but has certain effect on the selective detection of Ni2+.

Key words: europium complexes, nitrogen heterocyclic ligands, crystal structure, fluorescence properties, fluorescence quenching