Effects of the Lewis acidity of organic solvents on the extractability of europium (III) with .BETA.-diketone and 1,10-phenanthroline.

TSUSIMA Shinpei, MATSUBAYASHI Izuru, HASEGAWA Yuko

doi:10.2116/bunsekikagaku.51.715

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β‐ジケトンと１，１０‐フェナントロリンによるユウロピウム（ＩＩＩ）の抽出効率に与える溶媒のルイス酸としての強さの効果
β-ジケトンと1,10-フェナントロリンによるユウロピウム(III)の抽出効率に与える溶媒のルイス酸としての強さの効果
ベータジケトント 1 10 フェナントロリンニヨルユウロピウム 3 ノチュウシュツコウリツニアタエルヨウバイノルイスサントシテノツヨサノコウカ

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Abstract

In order to study the effect of the Lewis acidity of solvents on extractability, the hydration number of the extracted species and the interaction between the solvents and phen were examined in the extraction of europium (III) with pivaloyltrifluoroacetone (PTA, HA) and/or 1,10-phenanthroline (phen, B) into dichloromethane, chloroform and pentachloroethane. In organic solvents, the water molecules coordinated to EuA₃ are replaced with phen to form phen complexes: EuA₃ · n₀H₂O_(o)+B_(o)^→_←EuA₃ · B_(o)+n₀H₂O_(o). The equilibrium constants are similar among organic solvents where the solvent-solute interaction is not significant. However, the value of K decreased in the sequence CH₂Cl₂>CHCl₃>C₂HCl₅. The IR spectra in carbontetrachloride containing the respective solvents showed a peak at 2987 cm^-1 for C₂HCl₅, at 3019 cm^-1 for CHCl₃, at 3049 cm^-1 and 2984 cm^-1 for CH₂Cl₂, while in the presence of phen the peak shifted at 2919 cm^-1 for C₂HCl₅ and 2967 cm^-1 for CHCl₃, and no change in CH₂Cl₂. The difference of the K values among the three solvents used in the present study is explained in terms of the different Lewis acidity, which was indicated by the download shift: CH₂Cl₂<CHCl₃<C₂HCl₅.

Journal

BUNSEKI KAGAKU

BUNSEKI KAGAKU 51 (9), 715-720, 2002

The Japan Society for Analytical Chemistry

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