稀土甘氨酸丁二酮肟配合物的研究

目的]研究稀土甘氨酸丁二酮肟配合物的性质。方法]合成3种稀土甘氨酸丁二酮肟配合物,通过元素分析、红外光谱、紫外光谱和热分析,研究配合物的组成和性质。结果]稀土甘氨酸丁二酮肟配合物的通式为:RE(Gly)2(DMG)Cl3.3H2O,溶于无水乙醇和水,在乙醇溶液中属于1∶3电解质,氯离子全部处于配合物的外界。红外光谱说明稀土离子与DMG中羟基氧配位。紫外光谱中配合物的吸收峰红移和摩尔吸收系数增大。配合物在100℃左右产生微弱的脱水吸热峰,225~242℃产生配合物的骨架断裂吸热峰,415~492℃产生1或2个很强的氧化放热峰,热分解的最终产物为稀土氧化物。结论]稀土甘氨酸丁二酮肟配合物具有相似的配位形式和结构类型。

Study on the Complexes of Rare Earth with Glycine and Dimethyl Glyoxime

Objective] The aim was to study the character of complexes of rare earth(RE) with glycine(Gly) and dimethyl glyoxime(DMG).Method] 3 complexes of rare earth(RE) with glycine(Gly) and dimethyl glyoxime(DMG) were synthesized and their composition and characters were investigated by elemental analysis,IR spectra,UV spectra and TG-DTA analysis.Result] The general formula of these complexes could be expressed as RE(Gly)2(DMG)Cl3·3H2O.These complexes could be dissolved into dehydrated alcohol and water,and belonged to electrolyte of 1∶3 in ethanol solution,with all chloridion in the surrounding of complexes. IR spectra showed that rare earth ion coordinated with hydroxyl oxygen of DMG.Redshift of absorption peak and molar absorbance coefficient of complexes increased in UV spectra.Complexes had weakly endothermic peak when it was dehydrated at 100 ℃,and had endothermic peak for frame break of complexes at 225-242 ℃ and 1 or 2 strong exothermic peak of oxidation at 415-492 ℃.The final outcome of thermal decomposition was oxide of rare earth.Conclusion] Complexes of rare earth(RE) with glycine(Gly) and dimethyl glyoxime(DMG) had similarly coordination pattern and structure type.