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分别以1,3,5-苯三甲酸(H3BTC)、苯六甲酸(H6MTA)和1,2,3,4,5,6-环己六甲酸(H6CCA)为配体合成了Eu(Ⅲ)的二元发光配合物Eu(BTC)2H2O,Eu2(MTA)4H2O和Eu2(CCA)4H2O.通过元素分析、红外光谱和等离子体原子发射光谱对其化学组成进行了结构表征,表征结果与理论吻合良好.利用荧光分度计,研究了所制备配合物室温条件下的荧光性能(荧光激发光谱、发射光谱、荧光寿命和量子效率),结果表明:该三种配合物在紫外光照射下,均发射Eu(Ⅲ)离子的特征红光,其中Eu2(MTA)4H2O(量子效率=10.25%,荧光寿命=0.36 ms)的荧光性能最好,这说明配体H6MTA的能级与Eu3+离子能级匹配程度很好.另外,通过热分析对配合物的热稳定性进行了分析,结果表明:该三种配合物均具有良好的热稳定性,主要分解温度远高于其他β-二酮配合物.
Eu (Ⅲ) was synthesized from 1,3,5-benzenetricarboxylic acid (H3BTC), mellitic acid (H6MTA) and 1,2,3,4,5,6-cyclohexanecarboxylic acid (H6CCA) Eu (BTC) 2H2O, Eu2 (MTA) 4H2O and Eu2 (CCA) 4H2O.The chemical composition was characterized by elemental analysis, FTIR and PLDAS.The results were in agreement with the theory The fluorescent properties (fluorescence excitation spectrum, emission spectrum, fluorescence lifetime and quantum efficiency) of the prepared complexes at room temperature were studied by fluorescence spectrophotometer. The results showed that the three complexes The Eu3 (Ⅲ) ion is characterized by its characteristic red light emission, of which Eu2 (MTA) 4H2O (quantum efficiency = 10.25%, fluorescence lifetime = 0.36 ms) shows the best fluorescence performance, indicating that the energy level of the ligand H6MTA matches the Eu3 + ion level In addition, the thermal stability of the complexes was analyzed by thermal analysis. The results showed that all the three complexes have good thermal stability and the main decomposition temperature is much higher than other β-diketone complexes.