两个发光铽(Ⅲ)配合物的晶体结构和荧光性质

Synthesis,Crystal Structure and Fluorescence Properties of Two Tb(Ⅲ) Complexes

采用水热法合成了两个稀土配合物[Tb(3-SBA)(IP)OH(H2O)]·H2O(1)和[Tb(dpdc)1.5(IP)(H2O)]n(2)(3-SBA=3-羧基苯磺酸根,dpdc=2,2′-联苯二甲酸根,IP=1H-咪唑[4,5-f][1,10]-邻菲啰啉),并用X-ray单晶衍射仪测定了它们的晶体结构。配合物1是由3-羧基苯磺酸根和羟基交替连接Tb(Ⅲ)离子形成的一维链。配合物2是由2,2′-联苯二甲酸根桥联Tb(Ⅲ)离子形成的一维链。配合物1与2在紫外灯下均发出强的绿色荧光,其荧光光谱中有四个发射峰,位于492,544,584和619nm,分别对应于Tb(Ⅲ)离子的5 D4→7 FJ(J=6-3)跃迁,其发射光谱中均不存在配体荧光。配体吸收紫外光,有效地转移能量给Tb(Ⅲ)离子。配合物1与2中Tb(Ⅲ)离子的5 D4发光显示了单指数衰减,寿命分别为0.287和0.439ms,发光量子产率分别为9.28%和7.07%。

Two coordination polymers with formula of[Tb（3-SBA）（IP）OH（H2O）]·H2O（1）and [Tb（dpdc）1.5（IP）（H2O）]n（2）（3-SBA=3-sulfobenzoate,dpdc=2,2′-diphenyldicarboxylate and IP=1H-imidazo[4,5-f][1,10]-phenanthroline）have been synthesised under hydrothermal condition and characterizated by X-ray single crystal diffraction.The complex 1 possesses a 1D chain structure constructed from Tb（Ⅲ）ions by 3-SBA ligands and OH groups.Complex 2 shows a 1Dchain structure constructed from Tb（Ⅲ）ions by dpdc ligands.The two complexes display the characteristic 5 D4→7 FJ（J=6-3）transitions at 492,544 584 and 619nm of Tb（Ⅲ）ion,respectively.No emission from the ligand could be observed,which indicates that the ligands absorb and transfer energy efficiently to central Tb（Ⅲ）ion.The emission decay curves reveal a monoexponential behaviour yielding the lifetime values of 0.287 ms for 1 and 0.439 ms for 2.The quantum yields of luminescence are 9.28% for 1 and7.07%for 2.