Nitrosylium Hexafluorouranate (NOUF ₆ ) and Its Derivatives

Nitrosylium hexafluorouranate NOUF₆ has been discovered in the late 1950s. It is part of the "NOUF" family currently represented by five members: NOUF₆, NOUF₇, (NO)₂UF₈, NO₂UF₆ and NO₂UF₇. Only two could be subject to careful characterization due to their high reactivity with the atmosphere and the nature of the fluorinating agents used: nitrosyl fluoride FNO and nitryl fluoride FNO₂, which are not commercial. This article proposes to revisit the synthesis of the least described compounds in the literature (NOUF₇, NO₂UF₆ and NO₂UF₇) thanks to a setup capable of both allowing the synthesis of nitrogen oxyfluorides and reacting them with uranium hexafluoride (UF₆). The reactions can be followed by gas-phase infrared spectroscopy, and the solid products will be characterized by powder X-ray diffraction and Raman spectroscopy.