HPMBP与Phen衍生物对稀土的协同萃取研究

Synergic Extraction Of Re with HPMBP and 1,10-phenanthrolines

本文研究了1—苯基—3—甲基—4—苯甲酰基吡唑酮—5(HPMBP,HA)与1,10—菲咯啉(phen)及其衍生物(2,9—二甲基1,10—菲咯啉,DMphen;4,7—二苯基1,10—菲咯啉Bathophen的氧仿溶液对轻重稀土(Pr,Nd,Ho,Er)的协同萃取,用斜率法确定了各萃合物的组成均为REA_3B,(B代表phen或其衍生物)并求出了各稀土离子的协萃平衡常数Kse。结果说明,HPMBP与phen类双齿含氮中性萃取剂对稀土均有较强的协萃效应,但phen上取代基不同,协萃效果也不同,无论是轻或重稀土,其Kse均是Bathophen>phen>DMphen.Bathophen(下面用Bphen表示)的Kse要比phen的大4—10倍,而DMphen的则要比phen的小2—4个数量级。前者是由于增大了萃合物的共轭平面,所以稳定性增加,后者则是受空间位阻的影响,稳定性减小。用饱和萃取法制得了Ho·A_3·Bphen,元素分析结果,萃合物符合HoA_3·phen组成。同时测定了该萃合物的紫外、红外光谱。

The synergic extraction of Pr(Ⅲ),Nd(Ⅲ),Ho(Ⅲ) and Er(Ⅲ) with 1 phenyl — 3 — methyl — 4 —benzoyl —pyrazol — 5 — one (HPMBP, HA ) and 1,10 — phenanthroline (phen) , 2,9 — dimethyl — 1,10 — phenanthroline (DMphen ) or 4,7 — dipheny 1 — 1,10 —phenanthroline(Bathophen) in chloroform solution have been studied. By slope analysis method, the formula of the extracted complexes was shown to be the same. The synergic effect of DMphen is much smaller than phen due to the steric effect of the substituents, but the synergic effect of Bathophen is much larger than phen due to the expansion of the conjugate system by the substituents.