Synthesis and characterization of uranium(V) fluoride fluorosulfates and uranium(V) oxyfluorosulfate: UF3(SO3F)2, UF(SO3F)4, and UO(SO3F)3

Article abstract of DOI:10.1021/ic50185a032

The new uranium(V) fluoride fluorosulfate compounds UF₃(SO₃F)₂ and UF(SO₃F)₄ and uranium(V) oxyfluorosulfate UO(SO₃F)₃ have been synthesized. UF₃(SO₃F)₂, a pale green solid, resulted from the reaction of UF₅ and S₂O₆F₂ in CFCl₃ at 40°C for 20 days; under these conditions the solvent also reacted and was partly transformed into CFCl₂OSO₂F and CF₂Cl₂. The beige solid UF(SO₃F)₄ was prepared by mixing UF₆ and SO₃ in CFCl₃ at low temperature (<-50°C) and evaporating the solvent. Its thermal decomposition at 80-100°C yielded UO(SO₃F)₃, a tetragonal gray-beige solid. These three compounds were characterized by chemical analysis. Their thermal stabilities and vibrational and electronic spectra are also reported. The +5 oxidation state of uranium was confirmed by magnetic susceptibility measurements. Despite several attempts under different conditions, no uranium(VI) fluorosulfate or fluoride fluorosulfate was obtained.