Journal of Radioanalytical and Nuclear Chemistry
Volume/Issue:
Volume 203: Issue 1
31P-NMR study of the organophosphorous complexes of uranium(VI)
II. The system uranyl nitrate-tri- N -butylphosphate-tri- N -octylphosphine oxide
Authors:
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 Institute for Physics and Nuclear Engineering P.O. Box MG-6 R-76900 Bucharest-Magurele (Romania)

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

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Pages:
189–197
Online Publication Date:
14 Aug 2005
Publication Date:
17 Feb 1996
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf02060394
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Abstract  

The formation of the mixed complex UO2(TOPO)(TBP)(NO3)2 is reported by31P-NMR spectroscopy for the first time. The extraction of the uranyl nitrate by a TBP and TOPO mixture was simulated in a NMR vial and monitored in situ. The equilibrium constant values of the processes in which the mixed complex is involved, i.e.:KR, for the redistribution of TBP and TOPO ligands between their uranyl complexes,KM, for the formation from consititutive molecules,Ks, for the substitution of the uranyl coordinated TBP by TOPO are determined. The redistribution constant,Kr at 25°C (4.43±0.5) and the changes of the thermodynamic variables H (0.59±0.14 kcal/mol). S (5.04±0.51 cal/mol·degree) have values close to the statistical values, suggesting a random nature of this process. TheKS value (4.5·103) reveals the much greater affinity for uranium(VI) of TOPO relative to TBP.

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Cover Journal of Radioanalytical and Nuclear Chemistry
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)

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