Chen Ye, Cai Wei-Min
School of Environmental Science and Engineering, Shanghai Jiaotong University, ShangHai 200240, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2005 Dec;62(4-5):863-8. doi: 10.1016/j.saa.2005.03.017. Epub 2005 Apr 26.
Rare earth binary complex Eu(NNA)3 (NNA, alpha-naphthylacetic acid), ternary complex Eu(NNA)3.phen (phen, 1,10-phenanthroline) and a series of dinuclear complexes with different mole ratios of Eu3+ to Gd3+ were synthesized. Many advanced approaches, such as element analysis, FTIR spectra, TG and DTA analysis, were used to determine the composition and structure of binary and ternary complex. Moreover, their fluorescence properties were studied by fluorescent spectra and lifetimes. The fluorescence spectra and decay curves of dinuclear complexes indicated that the fluorescence emission intensity was enhanced and the fluorescence lifetime was prolonged by Gd3+. The dinuclear complexes show the best properties when the mole ratio of Eu3+ to Gd3+ is 6:4. A new parameter Y, which was used to evaluate the effect of Gd3+, was introduced. In addition, the relationship of Y value and mole fraction of Gd3+ was analyzed by mathematical software. The results showed that Y value decreased by single exponential mode when the content of Gd3+ decreased.
合成了稀土二元配合物Eu(NNA)3（NNA为α-萘乙酸）、三元配合物Eu(NNA)3·phen（phen为1,10-菲啰啉）以及一系列不同Eu3+与Gd3+摩尔比的双核配合物。采用元素分析、傅里叶变换红外光谱（FTIR）、热重（TG）和差示热分析（DTA）等多种先进方法来确定二元和三元配合物的组成与结构。此外，通过荧光光谱和寿命研究了它们的荧光性质。双核配合物的荧光光谱和衰减曲线表明，Gd3+增强了荧光发射强度并延长了荧光寿命。当Eu3+与Gd3+的摩尔比为6:4时，双核配合物表现出最佳性能。引入了一个新参数Y来评估Gd3+的作用。此外，利用数学软件分析了Y值与Gd3+摩尔分数的关系。结果表明，当Gd3+含量降低时，Y值以单指数模式下降。
