吡唑-吡啶铕配合物的合成、结构及荧光效应

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。

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

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⁺.