Synthesis and study of Np(V) sesquioxalates |
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| Authors: | N. N. Krot A. A. Bessonov I. A. Charushnikova V. I. Makarenkov |
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| Affiliation: | (1) Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia |
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| Abstract: | Neptunium(V) at its relatively high concentrations in oxalate solutions forms, along with the mono-and bioxalate complexes, the intermediate binuclear anion (NpO2)2(C2O4) 3 4? . This anion gradually crystallizes from cold aqueous-ethanol solutions in the form of the compound Na4(NpO2)2(C2O4)3 · 6H2O, and from hot aqueous-ethanol solutions, in the form of a lower hydrate, Na4(NpO2)2(C2O4)3 · 2H2O. Both compounds were characterized by powder X-ray diffraction and by electronic absorption and IR spectra. The thermal behavior of the hexahydrate in air was studied. Attempts to prepare the related crystalline compounds M4(NpO2)2(C2O4)3 · nH2O with M = Li or NH4 failed. |
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