均苯三甲酸Eu-Tb配合物的合成及荧光性质研究  

Synthesis and Fluorescence Characteristics of Eu-Tb Complexes with Trimesic Acid

作　　者：王继业[1] 高元哲[1] 王涛[2] 

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 [2]河北科技大学理学院,河北石家庄050016

出　　处：《光谱学与光谱分析》2008年第12期2912-2915,共4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H3BTC为配体,用水热法合成了均苯三甲酸Eu-Tb系列发光配合物Eu1-xTbxBTC.nH2O(H3BTC=1,3,5-均苯三甲酸,x=0,0.1,0.3,0.5,0.7,0.9,1.0;n=0,0.5),通过化学分析及元素分析确定了配合物的组成,用红外光谱对其进行了表征;研究了配合物的激发光谱和发射光谱,并就其荧光强度与两种稀土离子含量之间的关系进行了讨论。结果表明:(1)该系列配合物(除纯均苯三甲酸Tb外)均发出Eu离子的特征荧光,而荧光强度随着Eu和Tb离子的不同发生了明显变化,发射峰位置基本不变;(2)系列配合物中Tb对Eu的荧光强度有敏化作用,Eu对Tb的荧光强度有猝灭作用;同时Eu离子的5D0→7F1和5D0→7F2跃迁发射强度较强,且均劈裂为两个峰(587,593 nm)及(611.2,618 nm),这是由于Eu离子所处的配位环境不同所引起的。A series of mixed rare earth complexes Eu1-xTbx（BTC）·nH2O（H3BTC=1,3,5-H3BTC,x=0,0.1,0.3,0.5,0.7,0.9, 1.0） were synthesized by the reaction of trivalent rare earth chlorides with trimesic acid.The contents of rare earth were mearsured by using EDTA titration method,the element analyses of C and H were performed by Vario EL elemental analyzer.Their infrared spectra were recorded by FTIR-8900 infrared spectrophotometer with KBr pellet,and the fluorescence spectra were recorded by using a Hitachi F-4500 fluorescence spectrophotometer at room temperature.These results show that these complexes Eu1-xTbx（BTC）·nH2O can emit intense fluorescence from europium ion,the intensity of the fluorescence of the series complexes is greater in ^5D0→^7F1,2,and both the positions（^5D0→^7F1,2） show splitting emission peaks,but the peak positions of their emission spectra basically remain unchanged.These may be caused by the different coordinating pattern of the carboxylate groups.Additionally,the fluorescence intensity of europium ions was sensitized by terbium ions and that of terbium ions was quenched by europium ions.in these complexes.It was attributed to efficient energy transfer from the strongly absorbing ligand to the rather poorly absorbing lanthanide ion.and from Tb3＋ to Eu^3＋.Moreover,the fluorescence emission of terbium ions increased markedly in these complexes.

关 键 词：Eu-Tb配合物 均苯三甲酸 荧光光谱 

分 类 号：O482.3[理学—固体物理] O614.3[理学—物理]