Synthesis and Characterisation of Mixed-Ligand Complexes of Uranium(IV) with Oxygen and Sulfur Containing Donor Ligands

Abstract

Mixed-ligand complexes of the type [U(OAc)2(β-diket)2] and [U(DETC)₂(β-diket)₂] [where OAc = CH₃COO-, β-diket = [CF₃COCHCOCF₃]⁻ (HFAA), [CH₃COCHCOCF₃]⁻ (TFAA), [C₄H₃SCOCHCOCF₃]' (TTA), [C₆H₅COCHCOCF₃]⁻(BTA), [C₆H₅COCHCOC₆H₅]⁻ (DBM), [CH₃COCHCOCH₃]⁻ (AA) and DETC = [(C₂H₅)₂NCS₂] have been synthesised and characterised by elemental analyses, infrared, ¹H NMR and mass spectral techniques. Thermogravimetric (TGA) analyses of some of the compounds were carried out to study the thermal decomposition modes. Uranium appears to be eight-coordinated in these complexes.