基于2,4,5,6-四氟间苯二甲酸构筑的稀土有机框架发光材料的合成及性质研究

稀土由于具有f电子，因此稀土-有机框架发光材料具有多样结构和独特的4f电子跃迁发光性质，被广大研究者们青睐．在绿色、环保、温和的水热条件下，选用Eu3+作为中心离子，通过引入配体四氟间苯二甲酸和辅助配体1,10-菲咯啉，合成了分子式为Eu₂(TFBA)₆(phen)₂(H₂O)₂]_n(1-Eu，其中TFBA为脱质子的四氟间苯二甲酸，phen为1,10-菲咯啉)的稀土-有机框架材料．同时，利用X射线粉末衍射法(PXRD)、热重分析法(TGA)、傅里叶红外光谱法(FT-IR)等测试方法对1-Eu进行了详细的表征，确定了其准确结构和稳定性能，深入分析了其激发和发射光谱、荧光衰减寿命及荧光量子产率．实验结果表明：1-Eu是一个二维结构的稀土-有机框架材料，其荧光衰减寿命为0.652 ms，具有55.28%的高荧光量子产率(QY)；除此之外，1-Eu还具有良好的耐水稳定性、热稳定性及耐酸碱性质．

Synthesis and Properties of Luminescent Rare Earth-Organic Frameworks That Based on 2,4,5,6-Tetrafluoro-Phthalic Acid

Rare earth-organic framework luminescent materials are favored by researchers due to their diverse structures,unique 4 f electron transition,and excellent luminescence properties. Under environmental friendly and mild hydrothermal conditions,this work selects Eu³⁺as the central ion,a new LnMOFs with the molecular formula ofEu₂(TFBA)₆(phen)₂(H₂O)₂]_n(1-Eu,TFBA=2,4,5,6-tetrafluoro-phthalic,phen=110-phenanthroline) rare earth organic framework materials was synthesized. Meanwhile, X-ray powder diffraction(PXRD),thermogravimetric analysis(TGA),Fourier transform infrared spectroscopy(FT-IR)were used to characterize 1-Eu in detail. The exact structure and stability of 1-Eu were determined,and the excitation and emission spectra,fluorescence decay lifetime and fluorescence quantum yield were further analyzed. The experimental results show that 1-Eu is a two-dimensional rare-earth organic framework material with a fluorescence decay life of 0. 652 ms and a high fluorescence quantum yield(QY)of 55. 28%.In addition,1-Eu shows excellent water resistance,thermal stability,acid and alkali resistance properties.