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Two new double thorium oxalates with sodium ions have been prepared and characterized by using scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS), Raman spectroscopy and single-crystal X-ray diffraction. The crystal structure of Na4[Th(C2O4)4] ·5.5H2O ( 1) contains infinite chains, [Th(μ2-C2O4)2(C2O4)3] n4 n-, with three terminating bidentate and two bridging tetradentate oxalate ligands. The crystal structure of Na10[Th2(C2O4)9] ·15H2O ( 2) comprises unique dimers, [Th2(μ2-C2O4)(C2O4)8]10-, with Th atoms being coordinated by five oxalato ligands, four terminating bidentate and one bridging tetradentate. The structure is the first dimer of tetravalent actinide oxalato complexes. The spectroscopic results are in good agreement with the crystal structures. [ABSTRACT FROM AUTHOR]

Reaction of UO2(NO3)2, NaOH, H2O2, and H3BO3 in aqueous solution leads to the formation of yellow crystals of Na14 [(UO2)(O2)1.5] 28·nH2O (I) at pH 8.5 within a few days, followed by transformation of (I) at room temperature to light yellow-green crystals of Na6 [UO2{B16O24(OH)8}] ·14H2O (II) (<80% yield). [ABSTRACT FROM AUTHOR]