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The outersphere complex of EuCl2+ in a mixed system of methanol and water of 1.0M (H, Na) (Cl, ClO4)

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Abstract

The stability constans,β 1, of each monochloride complex of Eu(III) have been determined in the methanol and water mixed system with 1.0 mol·dm−3 ionic strength using a solvent extraction technique. The values ofβ 1 increase with an increase in the mole fraction of methanol (X S ) in the mixed solvent system when 0≤X S ≤0.40. The, distance of Eu3+−Cl− in the mixed solvent system was calculated using the Born-type equation and the Gibbs' free energy derived fromβ 1. Calculation of the Eu3+−Cl− distance and the preferential solvation, of Eu3+ by water proposed the variation of the outersphere complex of EuCl2+ as follows: (1) [Eu(H2O)9]3+Cl−, [Eu(H2O)8]3+Cl− and [Eu(H2O)7(CH3OH)3+Cl− inX S≤0.014, (2) [Eu(H2O)8]3−Cl− and [Eu(H2O)7(CH3OH)]3+Cl− in 0.014<X S <0.25 and (3) [Eu(H2O)7(CH3OH)]3−Cl− and [Eu(H2O)6(CH3OH)[2 3+Cl− in 0.25<X S ≤0.40.

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Authors and Affiliations

  1. Radiochemistry Research Laboratory, Faculty of Science, Shizuoka University, 836 Ooya, 422, Shizuoka-shi, Japan

    H. Suganuma, M. Nakamura & T. Omori

  2. Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, 980, Sendai-shi, Japan

    I. Satoh

Authors
  1. H. Suganuma
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  2. M. Nakamura
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  3. I. Satoh
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  4. T. Omori
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Suganuma, H., Nakamura, M., Satoh, I. et al. The outersphere complex of EuCl2+ in a mixed system of methanol and water of 1.0M (H, Na) (Cl, ClO4). J Radioanal Nucl Chem 224, 95–98 (1997). https://doi.org/10.1007/BF02034618

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  • DOI: https://doi.org/10.1007/BF02034618

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