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本文报道合成了八种苯甲酸及其一氯代衍生物与邻菲罗啉或联吡啶的稀土铕三元配合物并测得了荧光光谱。通过改变第一和第二配体,研究了配合物发光峰强度、位置和分裂间隔等的变化情况,依据荧光发射峰的分裂推断出Eu~(3+)离子所处的局域环境对称性大致都是C_1,C_2或C_s。虽然配合物的局域对称性大致相同,但由于配体场作用和能级匹配等原因,发光峰位置和强度是不同的;讨论了第一配体分子结构的变化对荧光性能的影响,认为分子自身结构的对称性可能对提高配合物发光性能有较大影响;实验还观察到第二配体也参与配位且对发光性能影响较大。同时看到发光峰的分裂间隔大小变化和发光峰的相对强度的变化是一致的。
In this paper, we report the synthesis of rare earth europium ternary complexes of eight benzoic acid and its derivatives with phenanthroline or bipyridine. Fluorescence spectra were measured. By changing the first ligand and the second ligand, we studied the luminescence peak intensities, positions and cleavage intervals of the complexes, and deduced the local environmental symmetry of the Eu 3+ ions according to the splitting of the fluorescence emission peak Roughly C_1, C_2, or C_s. Although the local symmetry of the complexes is roughly the same, the positions and intensities of the luminescence peaks are different due to ligand field and energy level matching. The effects of the molecular structure of the first ligand on the fluorescence properties are discussed. The symmetry of the self-structure of the molecule may have a greater impact on improving the luminescent properties of the complex. The experiment also observed that the second ligand also participates in the coordination and has a great influence on the luminescent properties. At the same time, it can be seen that the change of the size of the splitting interval of the luminescence peak and the change of the relative intensity of the luminescence peak are consistent.