%0 Conference Paper %F Oral %T Preparation of a New Water Soluble Polynuclear Peroxide Complex of Pu(IV) %+ CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)) %+ European Commission - Joint Research Centre [Karlsruhe] (JRC) %+ CEA-DEN %A Virot, M. %A Dalodiere, E. %A Dumas, T. %A Dieste Blanco, O. %A Wiss, T. %A Moisy, P. %A Nikitenko, Si. %< avec comité de lecture %B Pu Futures 2018 %C San Diego, United States %8 2018-09-09 %D 2018 %K Plutonium %K Peroxides %K Sonochimie %K Ultrasons %K Redox %Z Physics [physics]/Nuclear Experiment [nucl-ex] %Z Physics [physics]/Nuclear Theory [nucl-th]Conference papers %X Due to its acido-basic, complexing and redox properties, hydrogen peroxide has been widely used in nuclear research and industry. Particularly, this salt-free reagent has been highly considered for the stabilization of Pu(IV) in acid conditions and the precipitation of Pu peroxides as precursors for PuO$_2$ preparation. The addition of H$_2$O$_2$ to Pu(VI) acid solutions allows its conversion into Pu(V) which disproportionates and allows the accumulation of Pu(IV).[1] Further addition of H$_2$O$_2$ may lead to Pu(III), or a mixture of Pu(IV) and Pu(III), through the generation of a Pu(IV) peroxo complexe which decompose in acid conditions.[1,2] The continuous addition of H$_2$O$_2$ to Pu(IV) acid solutions leads to the progressive formation of a brown peroxo complex which turns red before insoluble plutonium peroxide precipitate.[2,3] The structure of these complexes which have been postulated in 1949 still remains under debate. Since, only one Pu peroxo structure has been recently proposed and concerned a dimeric molecular compound prepared in alkaline conditions.[4] The current study focuses on the behavior of Pu(IV) aqueous solutions in slightly acid conditions in the presence of hydrogen peroxide. We particularly describe the first observation of a water soluble polynuclear peroxo complex of Pu(IV) which has, up to our knowledge, never been reported in the literature. %G English %2 https://cea.hal.science/cea-02400196/document %2 https://cea.hal.science/cea-02400196/file/201800001471.pdf %L cea-02400196 %U https://cea.hal.science/cea-02400196 %~ CEA %~ DEN