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以4-氟苯甲酸(4-FBA)、4-氯苯甲酸(4-ClBA)为配体制备了具有良好热稳定性的稀土配合物Tb(4-FBA)3·2H2O和Tb(4-ClBA)3·2H2O,与前期工作中合成的Tb(4-BrBA)3的紫外及荧光光谱进行了分析比较。紫外-可见光吸收光谱表明,相同浓度下,3种配合物的紫外吸收能力以Tb(4-FBA)3·2H2O、Tb(4-ClBA)3·2H2O、Tb(4-BrBA)3顺序依次增大。液体荧光光谱表明,Tb(4-ClBA)3·2H2O的荧光发射强度最强。从配体的能级、配合物的紫外吸收能力及能量传递过程中的热振动损耗等方面对实验结果进行了讨论分析。热重分析表明,Tb(4-FBA)3·2H2O和Tb(4-ClBA)3·2H2O在450℃出现快速分解。将2种配合物放置于马弗炉中350℃加热1 h后,发现Tb(4-FBA)3·2H2O的荧光发射强度降低了24%,Tb(4-ClBA)3·2H2O荧光发射强度仅降低了13%左右,表明2种配合物高温条件下分子结构保持稳定,加热后2种配合物的红外光谱也表明2种配合物在高温条件下未发生分解。
(4-FBA) 3 · 2H2O and Tb (4- ClBA) 3 · 2H2O. The UV spectra and fluorescence spectra of Tb (4-BrBA) 3 synthesized in the previous work were compared and analyzed. UV-Vis absorption spectra showed that the UV absorption capacity of the three complexes was increased in the order of Tb (4-FBA) 3 · 2H2O, Tb (4-ClBA) 3 · 2H2O and Tb (4-BrBA) 3 at the same concentration Big. Fluorescence spectra showed that Tb (4-ClBA) 3 · 2H2O had the strongest fluorescence emission. The experimental results are discussed and analyzed from the energy levels of the ligands, the UV absorption capacity of the complexes and the thermal vibration loss during energy transfer. Thermogravimetric analysis shows that Tb (4-FBA) 3 · 2H2O and Tb (4-ClBA) 3 · 2H2O decompose rapidly at 450 ℃. When the two complexes were placed in a muffle furnace and heated at 350 ° C for 1 h, the fluorescence emission intensity of Tb (4-FBA) 3.2H2O was reduced by 24%, and the fluorescence emission intensity of Tb (4-ClBA) 3.2H2O was only Decreased by about 13%, indicating that the molecular structure of the two complexes remained stable under high temperature. The infrared spectra of the two complexes after heating showed that the two complexes did not decompose under high temperature.