有机配合剂稳定高价稀土元素的研究 Ⅰ.丙二酸水溶液中稳定Pr(Ⅳ)的研究  

Studies on Stabilization of High Valence Rare Earth with Organic Complexing Agent L On the Stability of Pr (Ⅳ) in Aqueous Malonic Acid Solution

作　　者：吴大庆[1] 冯殿忠[2] 

机构地区：[1]浙江大学化学系 [2]兰州大学化学系

出　　处：《化学学报》1989年第11期1109-1112,共4页Acta Chimica Sinica

摘　　要：由于高价镨（Ⅳ）标准有电位很高（EPr（Ⅳ）／Pr（Ⅲ）°=+3.2V)，早期一般系用或非水体系中得到高价镨的化合物，近年来，利用无机配合剂稳定水相中Pr（Ⅳ）的工作已有一些报道，但用有机配合剂稳定Pr（Ⅳ）的工作，国内外尚未见报道，我们将制得的Pr（Ⅳ，Ⅲ）碱式碳酸盐溶于丙二酸水溶液中，研究了Pr（Ⅳ）在该溶液中的行为和稳定情况。Under certain condition, the Pr(Ⅳ, Ⅲ) basic carbonates are soluble in aqueous solution of malonic acid to yield an yellow complex Pr(Ⅳ)-CH_2(CO_2)_2^(2-) which shows a broad characteristic absorption band at 265 nm. The complex composition ratio of Pr(Ⅳ) -CH_2(CO_2)_2^(2-) determined by equilibrium shift is 1:2. It has been found that the reduction kinctics of Pr(Ⅳ)-CH_2(CO_2)_2^(2-) complex in aqueous solution is pseudo first order reaction for Pr(Ⅳ). The various factors effecting the stability of Pr(Ⅳ)-CH_2(CO_2)_2^(2-) complex in the solution have also been studied by spectrophotometic methods.

关 键 词：镨(Ⅳ) 有机配合剂 丙二酸水溶液 稳定性 

分 类 号：O614.334[理学—无机化学]