2,2′-联苯醚二甲酸和邻菲啰啉构筑的单核铽(Ⅲ)配合物:荧光性质及对Fe^(3+)的发光传感

A Mononuclear Terbium(Ⅲ)Complex Constructed with 2,2′-Oxybis(benzoic acid)and 1,10-Phenanthroline:Fluorescence and Fluorescent Sensing for Fe^(3+) ion

采用水热法合成了一种新的配合物[Tb(2,2′-oba)_2(phen)_2]^-(H_3^+O)(2,2′-oba=2,2′-联苯醚二甲酸,phen=1,10-邻菲啰啉),并用X-ray单晶衍射仪测定了晶体结构。配合物是由两个邻菲啰啉和两个2,2′-联苯醚二甲酸铽离子构成的单核分子。配合物的荧光光谱在489,546,584和622nm处出现发射峰,归属为中心Tb^(3+5)D_4→7 FJ(J=6-3)跃迁产生的特征荧光。在546nm处的发射最强,对应于~5D_4→~7F_5跃迁,为绿光。探讨了不同金属阳离子对配合物的荧光效应影响。实验结果表明Fe3+对配合物具有显著的荧光猝灭作用,在生理环境pH 4.0~8.0范围内仍然适用,因此配合物可用于生命体系中的Fe^(3+)作荧光探针。

New complex [Tb（2,2′-oba）2 （phen）2 ]-（H＋3 O）（2,2′-oba=2,2′-oxybis（benzoic acid）,phen=1,10-phenanthroline） was synthesized under hydrothermal condition and characterized with X-ray single crystal diffraction.Complex reveals mononu-clear structure containing TbO4 N4 unit.Complex displays the emission peaks at 489,546,584 and 622 nm,corresponding to the 5D4→7FJ（J=6-3）transitions of Tb（Ⅲ）ion.The emission band at 546 nm corresponds to the 5D4→7F5 transition of the Tb （Ⅲ）ion,which gives an intense green luminescence output for the solid sample.The recognition for metal ions was discussed with fluorescent spectroscopy.The results show that it has high selectivity for Fe3＋ via a fluorescence quenching mechanism. Luminescent investigations reveal that it can detect Fe3＋ with relatively high sensitivity and selectivity,even when pH 4.0-8.0, which leads to its application in biotic and environmental system.