Synthesis of New Crystalline Pu(V) Compounds from Solutions: III. Synthesis and Study of NaPuO2C2O4·nH2O with n = 3, 1, and 0

NaPuO₂C₂O₄·3H₂O was isolated from a freshly prepared oxalate solution of Pu(VI) by reduction with a stoichiometric amount of hydrazine hydrate. Heating of the compound results in its stepwise dehydration with successive formation of the monohydrate and anhydrous salt. According to powder X-ray patterns, NaPuO₂C₂O₄·nH₂O (n = 3, 4) is isostructural to the corresponding analogs NaNpO₂C₂O₄·nH₂O. The unit cell parameters of NaNpO₂C₂O₄·H₂O and NaPuO₂C₂O₄·nH₂O (n = 3, 1) were determined. The results of the X-ray analysis and the electronic and IR spectra of the neptunyl(V) and plutonyl(V) crystalline compounds suggest the presence of cation-cation bonds in NaPuO₂C₂O₄·nH₂O (n = 1, 0). __________ Translated from Radiokhimiya, Vol. 47, No. 2, 2005, pp. 105–109. Original Russian Text Copyright ? 2005 by Krot, Bessonov, Grigor’ev, Charushnikova, Makarenkov.