吡唑-吡啶铕配合物的合成、结构及荧光效应

doi:10.11944/j.issn.1000-0518.2018.10.170360

摘要/Abstract

摘要：

以硝酸铕为金属源,2,6-二-[3-(5-苯基-1-氢-吡唑基)]吡啶(L)为配体,在水热反应条件下合成了一种新型配合物Eu(L)(MeOH)(NO₃)₃。通过元素分析、红外光谱、热重分析、X射线粉末衍射以及X射线单晶衍射方法对该配合物进行了表征。结构分析表明,配合物的中心金属为九配位,每个中心金属铕原子与L配体中的3个N原子和硝酸根离子和配位甲醇分子上的6个氧原子配位,形成轻微扭曲的三帽三角棱柱体的空间构型。荧光性能研究发现,该配合物对金属离子铜和镍有较强的荧光猝灭效应。即使在其它竞争金属离子的存在下,配合物仍然可以选择性地检测Cu²⁺,但对选择性的检测Ni²⁺有一定影响。

关键词: 铕配合物, 氮杂环类配体, 晶体结构, 荧光性能, 荧光猝灭

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

王玉, 张莉静, 王颖, 白凤英, 邢永恒. 吡唑-吡啶铕配合物的合成、结构及荧光效应[J]. 应用化学, 2018, 35(10): 1256-1263.

WANG Yu, ZHANG Lijing, WANG Ying, BAI Fengying, XING Yongheng. Synthesis, Structure and Fluorescence Effects of Pyrazole-Pyridine Europium Complex[J]. Chinese Journal of Applied Chemistry, 2018, 35(10): 1256-1263.

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