イットリウム-,及びランタン-テノイルトリフルオロアセトン錯体の有機溶媒中での挙動

概要

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In order to clarify synergistic effect of organic bases in solvent extraction of rare earth metals, the stability of complexes, HPi^+[M(TTA)_4]^-(HPi^+:γ-picolinium cation, TTA : thenoyl trifluoroacetonate anion, M : Y and La) in basic acetone and in basic dichloromethane was studied by PMR spectroscopy. The La-complex dissociated into a triscomplex in acetone as follows: HPi^+[M(TTA)_4]^-→M(TTA)_3+HTTA+Pi…(I) It was the same reaction that had been proposed by the authors for the Y-complex in acetone. In dichlorometane, both complexes were more stable and the reaction (I) could not be observed. With addition of tributylphosphate (TBP) to acetone solution of the La-complex and to dichloromethane solutions of both complexes, the following reaction, also already proposed for the Y-complex in acetone, occured: HPi^+[M(TTA)_4]^-+nTBP→M(TTA)_3nTBP+HTTA+Pi…(II) Effect of metals or solvents on the equilibrium constant of the reaction (II) could be estimated. The La-complex has a larger constant than the Y-complex, and as for each complex, a larger constant was obtained in acetone than in dichloromethane.
社団法人日本分析化学会の論文
1976-09-10