The outersphere complex of EuCl2+ in a mixed system of methanol and water of 1.0M (H, Na) (Cl, ClO4) |
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| Authors: | H Suganuma M Nakamura I Satoh T Omori |
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| Institution: | (1) Radiochemistry Research Laboratory, Faculty of Science, Shizuoka University, 836 Ooya, 422 Shizuoka-shi, Japan;(2) Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, 980 Sendai-shi, Japan |
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| Abstract: | The stability constans,
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 of
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 from
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
S0.014, (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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| Keywords: | |
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