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  • 1 Shizuoka University Radiochemistry Research Laboratory, Faculty of Science 836 Ooya 422 Shizuoka-shi Japan
  • | 2 Tohoku University Institute for Materials Research 2-1-1 Katahira, Aoba-ku 980 Sendai-shi Japan
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The stability constants , of monochloride complex of Eu(III) in the tracer concentrations have been determined in the mixed system of dimethyl sulfoxide (DMSO) and water with 1.0 mol·dm−3 ionic strength using a solvent extraction technique. The values of decrease up to about 0.2 mole fraction of DMSO (Xs) in the mixed solvent system and then increase. Calculation of Eu3+−Cl distance using a Born-type equation of the Gibbs' free energy derived from the revealed that the estimated distance between Eu3+ and Cl (dEu−Cl) increases linearly withXs in 0≤Xs<0.043 and 0.043<Xs<0.172, but their slopes are different. The line in the first region means a linear enlargement of the thickness of the primary solvation sphere of Eu3+ with increasingXs. The larger slope againstXs in 0.043<Xs<0.172 is attributable to lowering of , based on the increase in the solvation number of the primary solvation sphere of Eu3+. The considerably large value ofdEu−Cl atXs=0.202 might result from lowering of by a coordination of ClO 4 into the secondary solvation sphere of Eu3+ and the extremely drop ofdEu−Cl atXs=0.276 might reflect on a conversion of the ion-pair type, i.e., the coexistence of two kinds of a solvent-shared ion-pair and a contact one by the appearance of the contact one.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
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Founder Akadémiai Kiadó
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Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
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ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)