Enhancement effect of tris(8-quinolinolato)cobalt(III) on the extraction of lanthanide(III) with 2-thenoyltrifluoroacetone

Journal Article · Sat May 01 04:00:00 EDT 1999 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299908934628· OSTI ID:343803

Imura, Hisanori; Kameta, Naohiro; Osada, Minori; Ohashi, Kousaburo ^[1]; Kimura, Takaumi; Yoshida, Zenko ^[2]

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1. Ibaraki Univ., Mito (Japan). Dept. of Environmental Sciences
2. Japan Atomic Energy Research Inst., Tokai (Japan). Advanced Science Research Center

Remarkable phenomenon that the extraction of lanthanide(III) (Ln) with thenoyltrifluoroacetone (Htta) in benzene is highly enhanced by the addition of inert mer-tris(8-quinolinolato)cobalt(III) (Co(q){sub 3}) has been found out. The effect of Co(q){sub 3} was ascribed to the formation of a 1:1 complex of Ln(tta), with Co(q){sub 3}, i.e., a binuclear complex, in the organic phase on the basis of the extraction-equilibrium analysis. The formation constants determined for La(tta){sub 3}, Eu(tta){sub 3}, and Lu(tta){sub 3}, with Co(q){sub 3} were as high as 10{sup 4.96}, 10{sup 4.56}, and 10{sup 3.97} respectively. Furthermore, in the spectrophotometric study, not only the hypsochromic shift of the ligand absorption band of Co(q){sub 3} but an isosbestic point were observed by increasing the concentration of Ln(tta){sub 3} in benzene. The formation constants of the binuclear complexes were also determined spectrophotometrically and confirmed to be comparable with those obtained by the extraction method.

• Sponsoring Organization: USDOE
• OSTI ID: 343803
• Journal Information: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 3 Vol. 17; ISSN 0736-6299; ISSN SEIEDB
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
40 CHEMISTRY
ADDITIVES
COBALT COMPOUNDS
EUROPIUM
LANTHANUM
LUTETIUM
ORGANIC FLUORINE COMPOUNDS
QUINOLINES
SOLVENT EXTRACTION