Interaction between uranium tetrafluoride oxide and the pentafluorides of arsenic, niobium, tantalum, and bismuth

Abstract

No reaction occurs between UF₄O and AsF₅ but UF₄O·3MF₅(M = Nb and Ta) and UF₄O·2BiF₅ have been obtained as yellow or orange solids by warming mixtures of UF₄O with excess of the appropriate pentafluoride in anhydrous HF or by combination of the oxide tetrafluoride with excess of the pentafluoride as a melt. The solid adducts have been characterized by their reaction stoicheiometries, chemical analyses, and vibrational spectra. Like UF₄O·2SbF₅, the adducts are fluorine bridged with some ionic character. The thermal decomposition of the adducts results in the production of uranyl species.