3,4-噻吩二羧酸、1,10-邻菲罗啉与稀土配合物的荧光性质及对硝基苯的检测

3,4-噻吩二羧酸(3,4-H₂tdc)，1,10-邻菲罗啉(phen)和稀土硝酸盐经水热法合成三种配合物Ln₂(Htdc)₂(tdc)₂(phen)₂(H₂O)₄(Ln=Eu 1, Gd 2, Tb 3)，并用X-射线单晶衍射分析方法测定了配合物1-3晶体结构，配合物1-3为双核分子。每个金属离子周围有2个3,4-tdc，1个3,4-Htdc，1个phen和2个配位水分子，配位数为9。配合物1和3在紫外灯下显强红光和绿光，其荧光发射光谱，在619和545 nm出现最大发射峰，分别对应于Eu(Ⅲ)离子的5D₀→7F₂和Tb(Ⅲ)离子的5D₄→7F₅跃迁。配合物2在425 nm观察到来自基于配体的π*→π最大发射峰。不同溶剂分子对配合物1荧光有不同程度的影响，基于荧光猝灭机理，配合物1具有选择性检测硝基苯污染物的能力。

Fluorescence Properties and the Detection of Nitrobenzene of Lanthanides Complex with 3,4-Thiophenedicarboxylic Acid and 1,10 Phenanthroline

3,4-thiophenedicarboxylic acid (3,4-H₂tdc) as the first ligand, 1,10-phenanthroline (phen) as the auxiliary ligand, three complexes Ln₂(Htdc)₂(tdc)₂(phen)₂(H₂O)₄(Ln=Eu 1, Gd 2, Tb 3) were synthesized with hydrothermal method. Single-crystal X-ray diffraction analysis reveals that complexes 1-3 were isostructural crystallize and both of complexes are binuclear molecules. In the complexes 1-3, the coordination number is nine. Each metal is bound to two 3, 4-tdc ligand, one 3,4-Htdc ligand, one phen and two water molecule. Complexes 1 and 3 display the red and green light under UV lamp, corresponding the characteristic peaks from 619 nm (5D₀→7F₂) and 545 nm (5D₄→7F₅). Complex 2 expresses a broad band at 425 nm is attributed to π*→π transition. Furthermore, under the excitation wavelength of 329 nm, the effects of different solvents on complex 1 was discussed and complex 1 could be a potential luminescent probe for detecting nitrobenzene through fluorescence quenching mechanism.