Rhenium dioxide trfluoride is an inorganic compound with the formula . A white diamagnetic solid, it one of the few oxyfluorides of rhenium, another being rhenium trioxide fluoride, . The material is of some academic interest as a rare example of an dioxide trifluoride. It can be prepared by the reaction of xenon difluoride and rhenium trioxide chloride:
According to X-ray crystallography, the compound can exist in four polymorphs. Two polymorphs adopt chain-like structures featuring octahedral Re centers linked by bridging fluorides. Two other polymorphs adopt cyclic structures and , again featuring octahedral Re centers and bridging fluorides. Like related oxyfluorides, these coordination oligomers break up in the presence of Lewis bases. Adducts of the formula where L = acetonitrile have been crystallized.