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

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,...

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Veröffentlicht in:Bunseki kagaku 2002-09, Vol.51 (9), p.715
Hauptverfasser: TSUSIMA, Shinpei, MATSUBAYASHI, Izuru, HASEGAWA, Yuko
Format: Artikel
Sprache:eng
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Zusammenfassung: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)->[arrow left]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
ISSN:0525-1931