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3,4-噻吩二羧酸(3,4-H_2tdc),1,10-邻菲罗啉(phen)和稀土硝酸盐经水热法合成三种配合物Ln_2(Htdc)_2(tdc)_2(phen)_2(H_2O)_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~5D_0→~7F_2和Tb(Ⅲ)离子的~5D_4→~7F_5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。
Three complexes Ln_2 (Htdc) _2 (tdc) _2 (3,4-H_2tdc), 1,10-phenanthroline (phen) and rare earth nitrate were synthesized by hydrothermal method (H 2 O) 4 (Ln = Eu 1, Gd 2, Tb 3). The crystal structure of complex 1-3 was determined by single crystal X-ray diffraction analysis. Complex 1-3 was a dual-core molecule. There are two 3,4-tdc, one 3,4-Htdc, one phen and two coordination water molecules around each metal ion, the coordination number is 9. Complexes 1 and 3 showed strong red and green under ultraviolet light. Their fluorescence emission spectra showed the maximum emission peaks at 619 and 545 nm, corresponding to ~ 5D_0 → ~ 7F_2 and Tb (Ⅲ) of Eu (Ⅲ) ) ~5D_4 → ~ 7F_5 transitions of ions. Complex 2 was observed at 425 nm from the ligand-based π ~ * → π maximum emission peak. Different solvents have different effects on the fluorescence of complex 1. Based on the fluorescence quenching mechanism, complex 1 has the ability to selectively detect nitrobenzene pollutants.