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改进了半微量相平衡研究方法,研究了La(NO_3)_3·4H_2O-NO_2B15C5-CH_3CN三元体系在25℃和15℃时的溶解度,测定了25℃各饱和溶液的折光率。结果表明,在该体系中只有一种计量配合物La(NO_3)_3·NO_2B15C5·4H_2O生成,该配合物的溶解度随温度的降低而减小,溶解度曲线覆盖的范围很大。利用不同方法获得了固态配合物La(NO_3)_3·NO_2B15C5·4H_2O。通过化学分析、紫外光度分析、红外光谱和差热与热重分析等研究了它的组成和性质,考查了它的水合度与后处理条件的关系。制得了二水合物La(NO_3)_3·NO_2B15C5·2H_2O及无水物。
The semi-micro phase equilibrium method was improved. The solubility of La (NO_3) _3 · 4H_2O-NO_2B15C5-CH_3CN ternary system at 25 ℃ and 15 ℃ was studied. The refractive index of each saturated solution at 25 ℃ was measured. The results showed that there was only one kind of complex La (NO_3) _3 · NO_2B15C5 · 4H_2O in the system. The solubility of the complex decreased with decreasing temperature, and the solubility curve covered a large range. Solid-state complex La (NO_3) _3 · NO_2B15C5 · 4H_2O was obtained by different methods. Its composition and properties were studied by chemical analysis, UV spectrophotometry, infrared spectroscopy, differential thermal analysis and thermogravimetric analysis. The relationship between hydration and post-treatment conditions was also investigated. The dihydrate La (NO_3) _3 · NO_2B15C5 · 2H_2O and anhydrate were obtained.