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Novel Mechanisms of Synergism and Coextraction caused by Metal Chelates as Complex Ligand

金属螯合物作为复合配体的协同共萃取新机制

基本信息

批准号：
14540553
负责人：
IMURA Hisanori
金额：
$ 2.24万
依托单位：
IBARAKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540553/
关键词：
complex ligand synergism synergistic effect coextraction adduct polynuclear complex rare earth metal chelate alkaline earth metal chelate 金属キレート希土類元素アルカリ土類元素協同効果抽出

项目摘要

1.Extraction of lanthanide(III) (Ln), especially La^<3+>, with 2-thenoyltrifluoroacetone (Htta) was remarkably enhanced along with the extraction of metal ions such as Al^<3+>, Sc^<3+>, and Fe^<3+> which are readily extracted to the organic phase; that is the coextraction was found out. From the equilibrium and IR studies, the coextraction was found to be ascribed to the formation of a 1:1 adduct or binuclear complex of Ln(tta)_3 with M(tta)_3 in the organic phase. In the acetylacetone (Hacae) system. Cu^<2+> and Zr^<4+> caused the coextraction of Ln, which was also due to the formation of binuclear complexes.2.Synergistic enhancement of the extraction of alkaline earth metals(II) (AE) such as Sr^<2+> and Ba^<2+> with Htta was found by the addition of Co(acae)_3 and CO(tta)_3. The synergism was ascribed to the formation of a binuclear complex of AR(tta)_2 with the Co chelates. Furthermore, the extraction of Sr^<2+> with Htta was enhanced when Al^<3+> or Fe^<3+> was extracted into the organic phase as M8TTA)_3. This phenomenon is the coextraction of AE along with the extraction of AL^<3+> or Fe^<3+>.3.The coextraction of rare earth metals(III) (RE) with 4-isopropyltropolone (Hipt) has been studied. The extraction of RE was not affected by the addition of Co(ipt)_3 although it acted as an effective complex ligand in the extraction of RE with Htta. On the other hand the extraction (distribution ratio) of LA^<3+> was increased by a factor of 60,80, and 200 with the extraction of 3x 10^<-5> M Sc^<3+>, Y^<3+>, and Lu^<3+>, respectively. Since the RE-dimers are known the be extracted in the Hipt system, the coextraction found in this study can be ascribed to the formation of hetero-binuclear complexes of RE.

1.2-噻吩甲酰三氟丙酮(HTTA)对La(III)(Ln)，特别是La~(2+)~(3+)的萃取有显著的促进作用，对Al~(2+)~(2+)、Sc~(2+)、Fe~(2+)等易被萃取到有机相中的金属离子有明显的协同萃取作用。从平衡和红外光谱研究发现，共萃取归因于有机相中Ln(Tta)_3与M(Tta)_3形成1：1的加合物或双核配合物。在乙酰丙酮(Hacae)体系中。2.Co(Acae)_3和Co(Tta)_3对碱土金属(AE)如Sr^&lt；2+&gt；和Ba^&lt；2+&gt；的协同增效作用归因于与Co形成了AR(Tta)_2的双核配合物。此外，当Al^&lt；3+&gt；或Fe^&lt；3+&gt；以M8TTA)_3形式被萃取到有机相中时，HTTA对锶的萃取作用得到了增强。这种现象是Al^&lt；3+&gt；或Fe^&lt；3+&gt；Co(Ipt)3是HTTA萃取稀土的有效络合物，但Co(Ipt)3的加入不影响稀土的萃取。3×10^~(-5)、Y^~(3+)和鲁^~(2+)的萃取率分别提高了60、80和200倍。由于已知稀土二聚体在HIPT体系中被萃取，本研究中发现的共萃取可归因于稀土异双核配合物的形成。