作　　者： ; ;

机构地区： 兰州大学化学化工学院

出　　处： 《稀土》 2002年第5期5-10,共6页

摘　　要： 以 13种配体分别与十余种稀土离子形成二元配合物 ,研究其水溶液荧光强度 ,结果发现 ,只有 Tb3+和 Eu3+ 有较强荧光 ,Dy3+ 和 Sm3+ 只有非常弱的荧光 ,而其它稀土离子不发光。荧光强度顺序除配体 DPA为 Eu3+>Tb3+ >Dy3+ >Sm3+ 外 ,其余配体的荧光强度顺序为 Tb3+ >Eu3+ >Dy3+ >Sm3+ 。以数种 4 -位取代吡啶 - 2 ,6-二甲酸衍生物为配体 ,与 Tb3+ 形成二元配合物体系 ,研究了 p H值、溶剂等因素对体系荧光强度的影响 ,测定了 p H近中性情况下配合物体系的激发与发射光谱及发光寿命等 ;研究了 4 -位不同取代基对体系发光性能的影响。结果表明 :1当 p H值近中性时体系的发光性能最好 ;2 4 -位上不同取代基对体系的发光性能也有较大的影响 ,一般地说 ,取代基为供电子基团时 ,体系的发光性能要优于取代基为吸电子基团的发光体系 ;3溶剂效应对体系的发光性能影响较大 ,其中低极性溶剂对体系的发光性能要优于高极性溶剂。我们发现 ,其中 4 -异丙氧基吡啶 - 2 ,6 -二甲酸、 4 -乙酰氨基吡啶 - 2 ,6 -二甲酸和 3-乙酰氨基吡啶 - 2 ,6 -二甲酸为 Tb3+ 的理想敏化剂。 Fluorescence of the substituted pyridine-2,6-dicaeboxylates of RE 3+ (RE 3+ =La 3+ ,Ce 3+ ,Nd 3+ ,Y 3+ ,Er 3+ ,Lu 3+ ,Sm 3+ ,Eu 3+ ,Tb 3+ ,Dy 3+ )was analyzed.The results show that substituted pyridine-2,6-dicaeboxylates can very efficiently sensitize luminescence of Eu 3+ and Tb 3+ ,but they sensitize Dy 3+ and Sm 3+ weakly,and do not sensitize the other RE 3+ .The luminescence intensities of the binary complexes are sensitive to pH and solvent.The excitation and emission spectra as well as the emission lifetimes for the binary complexes are reported.The experimental results show that the intensities of all the binary complexes are strongest in the neutral aqueous solution.In the neutral aqueous solution the fluorescence intensities and lifetimes of the ternary complexes are better.The luminescence of the complexes with electron-donation groups is also better than that of the complexes with electron -withdrawing groups.The luminescence of the complexes in the low-polar solvent is better than that in the high-polar solvent.We found out the better sensitizers of Tb(Ⅲ). They are 3(or 4)-acetaminopyridine-2,6-dicarboxylic acid and isopropoxypyrdine-2,6-dicarboxylic acid.

关 键 词： 吡啶 二甲酸 配体 稀土配合物 荧光性能

领　　域： [理学] [理学] [理学] [理学]