On the variation of the stability constants of EuCl2+ in the mixed system of dimethyl sulfoxide and water

H. Suganuma; M. Nakamura; M. Mizuno; I. Satoh; T. Omori

doi:10.1007/bf02388021

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 231: Issue 1-2

On the variation of the stability constants of EuCl²⁺ in the mixed system of dimethyl sulfoxide and water

Authors:

H. Suganuma

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

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M. Nakamura

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

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M. Mizuno

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

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I. Satoh

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

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T. Omori

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

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Pages:: 143–146

Online Publication Date:: 12 Apr 2006

Publication Date:: 17 May 1998

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02388021

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Abstract

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 (X_s) 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⁻ (d_Eu−Cl) increases linearly withX_s in 0≤X_s<0.043 and 0.043<X_s<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 increasingX_s. The larger slope againstX_s in 0.043<X_s<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 ofd_Eu−Cl atX_s=0.202 might result from lowering of by a coordination of ClO ₄⁻ into the secondary solvation sphere of Eu³⁺ and the extremely drop ofd_Eu−Cl atX_s=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 Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)