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用氯化稀土与苯甲酸铵在水溶液中反应，合成了苯甲酸稀土（Ｅｕ，Ｌａ）三元固体系列配合物，其化学组成式为（Ｅｕ１－ｘＬａｘ）Ｌ３（其中Ｌ为Ｃ６Ｈ５ＣＯＯ－，ｘ＝０．０～１．０）。研究了它们的红外光谱和荧光光谱。由红外光谱数据表明，配合物中羧基的对称和反对称伸缩振动吸收峰发生了分裂，而且羧基伸缩振动随着Ｌａ３＋离子含量的增加发生了规律性的变化。荧光光谱实验结果表明，用不发光的Ｌａ３＋离子取代苯甲酸铕中部分Ｅｕ３＋离子可以提高Ｅｕ３＋离子的特征荧光发射强度。
(Eu, La) ternary solid complex was synthesized by the reaction of rare earth chloride and ammonium benzoate in aqueous solution. The chemical composition formula is (Eu1-xLax) L3 (where L is C6H5COO-, x = 0.0 ~ 1.0). Their infrared and fluorescence spectra were studied. From the infrared spectrum data, the symmetrical and antisymmetric stretching vibrational absorption peaks of the carboxyl groups were split, and the stretching vibration of carboxyl groups changed regularly with the increase of La3 + ion content. Fluorescence spectroscopy results show that the emission intensity of Eu3 + ions can be enhanced by substituting some Eu3 + ions in europium benzoate with non-luminescent La3 + ions.