Interaction of trivalent f-element cations with iodide in methanol + water solvents

K. Hayashi; T. Mori; M. Yanaga; I. Satoh; H. Suganuma

doi:10.1007/s10967-007-7106-2

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 279: Issue 1

Interaction of trivalent f-element cations with iodide in methanol + water solvents

Authors:

K. Hayashi

K. Hayashi Shizuoka University Radiochemistry Research Laboratory, Faculty of Science 836 Ohya, Suruga-ku Shizuoka-shi 422-8529 Japan

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T. Mori

T. Mori Shizuoka University Radiochemistry Research Laboratory, Faculty of Science 836 Ohya, Suruga-ku Shizuoka-shi 422-8529 Japan

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M. Yanaga

M. Yanaga Shizuoka University Radiochemistry Research Laboratory, Faculty of Science 836 Ohya, Suruga-ku Shizuoka-shi 422-8529 Japan

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I. Satoh

I. Satoh Tohoku University Institute for Materials Research 2-1-1 Katahira, Aoba-ku Sendai-shi 980-8577 Japan

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H. Suganuma

H. Suganuma Shizuoka University Radiochemistry Research Laboratory, Faculty of Science 836 Ohya, Suruga-ku Shizuoka-shi 422-8529 Japan

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Pages:: 165–169

Online Publication Date:: 21 Jul 2008

Publication Date:: 01 Jan 2009

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10967-007-7106-2

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Abstract

The stability constants (β₁) of iodide ion-pairs of trivalent f-block element ions (lanthanoids Ce, Eu, Gd, Tb and Tm, and actinoid Am) were determined in the vicinity of pH 2.5 of mixed methanol/water solvent solutions of an ionic strength of 1.00 mol·dm⁻³ at 298±1 K. The values were less than 2. From the variation in distance between Eu³⁺ and I⁻, which was calculated using a Born-type equation for Gibbs’ free energy derived from β₁(Eu), the Eu³⁺-I⁻ interaction was shown to be solvent-shared ion-pair formation when the mole fraction of methanol (X_MeOH)≤0.40. In contrast, it was suggested that the interaction of Am³⁺-I⁻ changed from solvent-separated ion-pair to solvent-shared ion-pair with increasing X_MeOH when X_MeOH≤0.10, but remained as solvent-shared ion-pair in the range 0.16≤X_MeOH≤0.40. Furthermore, β₂(Am) was measured in the range 0.31≤X_MeOH≤0.40. It was also shown that the β₁ values of lanthanoids at X_MeOH = 0.40, except for that of Gd(III), decreased with increasing atomic number.

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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)