Expanding pentafluorouranates: hydrothermal synthesis and characterization of β-NaUF5 and β-NaUF5·H2O

摘要: Two new sodium uranium(IV) pentafluorides were synthesized from uranium dioxide, HF, and NaF using mild hydrothermal conditions. β-NaUF5·H2O has greater lattice energy than previously-known α-NaUF5·H2O possesses lower symmetry with the latter compound being orthorhombic, whereas is monoclinic. Trigonal β-NaUF5 also different connectivity between [UFn] building units α-phase, higher orthorhombic α-NaUF5. The single crystal absorption spectra of these compounds are reported compared.