31P-NMR study of the organophosphorous complexes of uranium(VI): I. The intermolecular ligand exchange kinetics in uranyl nitrate complexes with TBP and TOPO

A. Vasilescu-Saidel; C. Turcanu; R. Grosescu

doi:10.1007/bf02060393

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 203: Issue 1

³¹P-NMR study of the organophosphorous complexes of uranium(VI)

I. The intermolecular ligand exchange kinetics in uranyl nitrate complexes with TBP and TOPO

Authors:

A. Vasilescu-Saidel

A. Vasilescu-Saidel Institute for Physics and Nuclear Engineering P.O. Box MG-6 R-76900 Bucharest-Magurele (Romania)

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C. Turcanu

C. Turcanu Institute for Physics and Nuclear Engineering P.O. Box MG-6 R-76900 Bucharest-Magurele (Romania)

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, and

R. Grosescu

R. Grosescu Institute for Physics and Nuclear Engineering P.O. Box MG-6 R-76900 Bucharest-Magurele (Romania)

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Pages:: 177–187

Online Publication Date:: 14 Aug 2005

Publication Date:: 17 Feb 1996

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02060393

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Abstract

The intermolecular ligand exchange in uranyl nitrate complexes with TBP and TOPO is studied by³¹P-NMR. The constant rates at 25°C in CCl₄ are: (8.47±1.86)·10³ s^–1 for U-TBP and (1.3±0.04)·10⁴M^–1·s^–1 for U-TOPO system. The very similar activation parameters values of the ligand exchange suggest the same mechanism for both systems, namely an one-step interchange mechanism. The differences between the systems regarding the rate equations and the extraction properties are discussed.

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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)