On the size variation of the primary solvation sphere of Nd3+ and Tm3+ in mixed system of methanol and water

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

doi:10.1007/bf02223379

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 223: Issue 1-2

On the size variation of the primary solvation sphere of Nd³⁺ and Tm³⁺ in mixed system of methanol and water

Authors:

H. Suganuma

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

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M. Nakamura

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

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T. Katoh

T. Katoh Shizuoka University Radiochemistry Research Laboratory, Faculty of Science 836 Ogya 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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, and

T. Omori

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

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Pages:: 167–172

Online Publication Date:: 10 Oct 2005

Publication Date:: 17 Sep 1997

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02223379

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Abstract

The stability constants, ₁, of each monochloride complex of Nd(III) and Tm(III) have been determined in the mixed system of methanol and water with 1.0 mol·dm^–1 ionic strength using a solvent extraction technique. The values of ₁ of Nd(III) and Tm(III) increase as the mole fraction of methanol in the mixed solvent system (X_s) increases. However, the variation mode of ₁ againstX_s in the region of 0.00X_s0.40 differs from each other, a concave curve for the Nd(III) and a convex curve for the Tm(III). The LnCl²⁺ formed is present as a solvent-shared ion-pair. Since Cl^– is a structure breaking ion, it was assumed that the primary solvation sphere of Ln³⁺ directly contacted with Cl^–. Calculation of Ln³⁺–Cl^– distance using Bom-type equation revealed the followings: (1) for Tm³⁺ with coordination number 8, the estimated distance between Tm³⁺ and Cl^– increases linearly withX_s in 0.00X_s0.40. The results mean an increase of the primary solvation sphere size of Tm³⁺ withX_s. (2) For Nd³⁺, the distance between Nd³⁺ and Cl^– decreases linearly withX_s in 0.00X_s<0.13, where both coordination numbers of 9 and 8 coexist, while it increases withX_s in 0.13<X_s0.40. The results mean a decrease of the primary solvation-sphere size of Nd³⁺ withX_s in 0.00X_s<0.13 and an increase of that withX_s in 0.13<X_s0.40.

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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)