均苯三甲酸铽掺杂(钇、钆)配合物的合成及荧光性质  

Synthesis and Fluorescence Properties of the Tb(Ln) Complexes with Trimesic Acid (Ln=Y,Gd)

作　　者：宋会花[1] 杨芳[1] 王继业[1] 石士考[1] 

机构地区：[1]河北师范大学化学与材料科学学院,河北石家庄050016

出　　处：《光谱学与光谱分析》2007年第10期2093-2097,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(50472020);河北师范大学博士基金项目(103261)资助

摘　　要：以均苯三甲酸(H3BTC)为配体,用水热法合成了系列稀土掺杂发光配合物,通过元素分析,EDTA滴定,红外光谱等确定了其组成为Tb(1-x)LnxBTC.0.5H2O(Ln=Y,Gd,x=0,0.1,0.3,0.5,0.7,0.9)。研究了配合物的荧光性质。该类配合物均能发出Tb3+的特征荧光,并且不发光的Y3+和Gd3+的掺入使配合物的荧光强度得到了增强,这可能是由于分子内能量传递的结果。Tb3+受到敏化作用而使荧光增强,但发射峰的位置基本上没有发生变化。在Tb3+的4个发射峰中5D4→7F5(544nm)处的发射峰强度最强,并在此条件下确定了掺杂离子的最佳掺入量,当Tb3+∶Y3+=0.5∶0.5,Tb3+∶Gd3+=0.3∶0.7时Tb(1-x)LnxBTC.0.5H2O(Ln=Y,Gd)的荧光强度最强。同时发现在最佳掺入量条件下Gd3+对Tb3+的敏化程度大于Y3+对Tb3+的敏化程度。In the present paper two series of mixed rare earth complexes Tb（1-x） LnxBTC· nH2O（Ln=Y, Gd, x=0, 0. 1, 0. 3, 0. 5, 0. 7, 0. 9） were synthesized by hydrothermal method. The contents of rare earth were measured by using EDTA titration method; the element analyses of C and H were performed by using Vario EL Ⅲ elemental analyzer, and the IR spectra were recorded by FTIR-8900 infrared spectroscopy with KBr pellet. Then the molecular formula of the complexes were determined to be Tb（1-x）〉LnxBTC ·0. 5H2O（Ln=Y, Gd）. The fluorescence spectrum of all the complexes were recorded by using a Hitachi F- 4500 fluorescence speetrophotometer at room temperature. The results indicated that all the complexes emitted characteristic fluorescence of Tb^3＋ , and the fluorescence intensities of the complexes were obviously enhanced with doping rare earth ion of y^3＋ or Gd^3＋. It was showed that Tb^3＋ was sensitized by doping rare earth ions. This may be because there was intra molecular energy transfer in the complexes. Being doped with the rare earth ion the emission peak positions did not change. Among the four emission peaks, ^5D4-→^7F5 （544 nm） was the strongest one, and it was found when the proportion is y^3＋ ： Tba＋ =0. 5 ： 0. 5 or Gd^3＋： Tb^3＋ = 0. 3 ： 0.7, the fluorescence intensity of Tb（1-x） Yx BTC·0. 5 H20 or Tb（1-x） GdxBTC·0. 5H2O was the greatest, meanwhile the sensitization degree was bigger with doping Gd^3＋ than doping Y^3＋ at 544 nm,

关 键 词：均苯三甲酸 稀土 掺杂 配合物 荧光光谱 

分 类 号：O614.3[理学—无机化学]