Effect of the introduction of amide oxygen into 1,10-phenanthroline on the extraction and complexation of trivalent lanthanide in acidic condition

Kobayashi, Toru ; Yaita, Tsuyoshi; Suzuki, Shinichi; Shiwaku, Hideaki ; Okamoto, Yoshihiro ; Akutsu, Kazuhiro*; Nakano, Yoshiharu*; Fujii, Yuki*

The extractability and complexation properties of lanthanides with -alkyl--phenyl-1,10-phenanthroline-2-carboxamide were investigated. These ligands, which contain two aza-aromatic donors and an oxygen donor in a molecule, are newly developed extractants for actinides and lanthanides. -Octyl--tolyl-1,10-phenanthroline-2-carboxamide exhibited high extractability of Eu $^{3+}$ even under acidic conditions. In addition, strong complexation in acidic media was confirmed by spectroscopic titration experiments. Investigation of the complexation equilibrium revealed that the presence of an oxygen donor promotes ligand coordination with lanthanides over the competing protonation reaction in acidic solution.

Language	:	English
Journal	:	Separation Science and Technology
Volume	:	45
Number	:	16
Pages	:	p.2431 - 2436
Publication Year/Month	:	2010/11
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Paper URL	:	https://doi.org/10.1080/01496395.2010.510094
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
Press Release	:
Article of JAEA R&D Review	:	Development of Novel Rare-Earth-Recognition Compound; For Efficient Separation and Purification of Rare-Earth Elements[/]
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Registration No. : AA20120551
JAEA Abstracts No. :
Paper Submission No. : 11490

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