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Denden I, Roques J, Poineau F, Solari PL, Schlegel ML, Blain G, Fattahi M. Behavior of heptavalent technetium in concentrated triflic acid under alpha-irradiation: technetium-triflate complex characterized by X-ray absorption fine structure spectroscopy and DFT. RADIOCHIM ACTA 2016. [DOI: 10.1515/ract-2016-2603] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The nature of the Tc species produced after the alpha-irradiation of Tc(VII) in concentrated triflic acid has been investigated by X-ray absoprtion fine structure (XAFS) spectroscopy and first principles calculations. Experimental and theoretical results are consistent with the formation of Tc(V)O(F3CSO3)2(H2O)2
+.
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Affiliation(s)
- Ibtihel Denden
- UMR 6457, SUBATECH Laboratory, 4 rue Alfred Kastler, La Chantrerie BP 20722, 44307 Nantes cedex 3, France
| | - Jérôme Roques
- IPN Orsay UMR 8608, Université Paris Sud, Bâtiment 100, 91406 Orsay Cedex, France
| | - Frederic Poineau
- Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, NV 89154, United States of America
| | | | - Michel L. Schlegel
- L’Orme des Merisiers, Synchrotron SOLEIL, Saint-Aubin – BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Guillaume Blain
- UMR 6457, SUBATECH Laboratory, 4 rue Alfred Kastler, La Chantrerie BP 20722, 44307 Nantes cedex 3, France
| | - Massoud Fattahi
- UMR 6457, SUBATECH Laboratory, 4 rue Alfred Kastler, La Chantrerie BP 20722, 44307 Nantes cedex 3, France
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Denden I, Poineau F, Schlegel ML, Roques J, Solari PL, Blain G, Czerwinski KR, Essehli R, Barbet J, Fattahi M. Behavior of Heptavalent Technetium in Sulfuric Acid under α-Irradiation: Structural Determination of Technetium Sulfate Complexes by X-ray Absorption Spectroscopy and First Principles Calculations. J Phys Chem A 2014; 118:1568-75. [DOI: 10.1021/jp404967f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- I. Denden
- UMR 6457, SUBATECH Laboratory, 4 rue Alfred Kastler, La Chantrerie BP 20722, 44307 Nantes cedex 3, France
| | - F. Poineau
- Department
of Chemistry, University of Nevada Las Vegas, Las Vegas, Nevada 89154, United States
| | | | - J. Roques
- IPN Orsay
UMR 8608, Université Paris Sud, Bâtiment 100, 91406 Orsay Cedex, France
| | - P. Lorenzo Solari
- L’Orme des Merisiers, Synchrotron SOLEIL, Saint-Aubin - BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - G. Blain
- UMR 6457, SUBATECH Laboratory, 4 rue Alfred Kastler, La Chantrerie BP 20722, 44307 Nantes cedex 3, France
| | - K. R. Czerwinski
- Department
of Chemistry, University of Nevada Las Vegas, Las Vegas, Nevada 89154, United States
| | - R. Essehli
- ESECO SYSTEMS, 270 rue Thomas Edison, Atelier Relais n 6, 34400 Lunel, France
| | - J. Barbet
- Cyclotron ARRONAX, 1,
rue Aronnax CS 10112, 44817 Saint-Herblain, France
| | - M. Fattahi
- UMR 6457, SUBATECH Laboratory, 4 rue Alfred Kastler, La Chantrerie BP 20722, 44307 Nantes cedex 3, France
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Abstract
Abstract
Redox reactions of Tc in aqueous solutions by sonolysis were investigated. Aqueous pertechnetate (Tc(VII)O4
−) solutions and Tc(IV)O2· n H2O colloids solutions were sonicated (200 kHz, 200 W) in a glass cell with flat bottom under Ar or He atmosphere at 20 °C. No reduction of TcO4
− was observed in this study. However, we found that the TcO2· n H2O colloids dispersed in an aqueous solution were completely dissolved by ultrasonic irradiation within 30 min under Ar atmosphere, and TcO4
− was eventually produced. The production of TcO4
− was considerably suppressed in the presence of t-butyl alcohol (an effective scavenger of OH radicals), indicating that Tc(IV) was oxidized by OH radicals (produced by dissociation of water molecules) in hot cavitation bubbles created by ultrasound. The formation rate of TcO4
− under He atmosphere was smaller than that under Ar atmosphere. This can be attributed to a difference of the effective maximum temperature in the collapsing bubbles. Because thermal conductivity of He is much higher than Ar, thermal transport effectively occurs from the bubbles to the surrounding liquid. Thus, temperature of cavitation bubbles filled with He should be lower than those filled with Ar, resulting in the smaller OH formation rate.
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Affiliation(s)
| | - Muhammad Zakir
- Tohoku University, Department of Chemistry, Graduate School of Scienc, Sendai, Japan
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