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为考查稀土配合物的特殊性能，合成了间溴苯甲酸与钪（Ⅲ）、钇（Ⅲ）、镧（Ⅲ）、钆（Ⅲ）的四种配合物．确定其组成为ＬｎＬ_３（Ｌｎ＝Ｓｃ，Ｙ，Ｌａ，Ｇｄ；Ｌ＝３－ＢｒＣ_６Ｈ_４ＣＯＯ）．这些化合物均不溶于一般的有机溶剂，可溶于二甲基亚砜．摩尔电导数据表明它们是非电解质．通过紫外和红外光谱研究，确定稀土离子与羧基为对称的双齿配位．这些配合物的荧光为Ｌ~＊－Ｌ型荧光，不是稀土离子的特征跃迁，而是稀土离子微扰的配体的电子跃迁．差热—热重分析表明配合物热稳定性较好，并给出了熔点．氧化分解失重与计算值相符．
In order to investigate the special properties of rare earth complexes, four complexes of m-bromobenzoic acid with scandium (Ⅲ), yttrium (Ⅲ), lanthanum (Ⅲ) and gadolinium (Ⅲ) were synthesized. The composition was determined as LnL_3 (Ln = Sc, Y, La, Gd; L = 3-BrC_6H_4COO). These compounds are insoluble in the general organic solvents, soluble in dimethyl sulfoxide. The molar conductance data shows that they are non-electrolytes. By UV and IR spectroscopy to determine the rare earth ions and carboxyl symmetrical bidentate coordination. The fluorescence of these complexes is L ~ * -L type fluorescence, not the characteristic transition of rare earth ions, but the electronic transition of the ligands perturbed by rare earth ions. Differential thermal analysis shows that the complex has good thermal stability and gives the melting point. Oxidative decomposition weight loss and the calculated value.