三嗪基共价有机多孔稀土杂化材料的制备与表征

Preparation and Characterization of Triazine-Based Covalent Organic Porous Rare-Earth Hybrid Materials

利用有机硅烷偶联剂对3,5-二氨基苯甲酸(DABA)中的羧基进行化学改性,成功地将其中的有机基团嫁接到DABA骨架上,制备前驱体DABA-Si。以DABA-Si作为构筑基元,采用溶剂热法构筑基于羧酸功能化的的共价有机骨架材料(COF)并进一步将β-二酮类稀土金属配合物Eu(tta)3组装到该COF材料孔道中,最终获得基于羧酸功能化的含有稀土铕离子的多孔杂化发光材料,并对杂化材料的结构和性能进行了详细的分析。通过傅立叶红外光谱(FTIR)、紫外-可见光谱(UV-vis)和N 2吸附-脱附曲线(BET)确定了杂化材料COF结构,并通过热重曲线和荧光光谱分析研究了材料的热稳定性以及荧光性能,结果表明杂化材料的热稳定性能和荧光效率比稀土小分子配合物均有显著的提高。

The carboxyl group of 3,5-diaminobenzoic acid(DABA)had been modified by silane coupling agent,and the organic group of the silane coupling agent was successfully grafted into DABA to obtain the precursor DABA-Si.Using the DABA-Si as the building block,a carboxylic acid modified COFs material was prepared by the solvothermal method,and thenβ-thiazolidinediones rare earth metals complexes Eu(tta)3 were assembled into the pores of the COFs material.Eventually,the carboxyl-functionalized rare-earth porous hybrid luminescent material with europium ion was prepared.The hybrid material was characterized in detail.Furthermore,the structure of hybrid was identified by fourier transform infrared spectroscopy(FTIR)spectra,ultraviolet visible spectroscopy(UV-vis)and nitrogen sorption measurement(BET).In addition,the thermal stability and fluorescence properties of the hybrid material had been discussed.The results indicate that the thermal stability and fluorescence efficiency of the hybrid materials are significantly better than the pure rare-earth complexes.