Rhenium trioxide fluoride is an inorganic compound with the formula . It is a white, sublimable, diamagnetic solid, although impure samples appear colored. It one of the few oxyfluorides of rhenium, the other major one being rhenium dioxide trifluoride . The material has no applications, but it is of some academic interest as a rare example of a trioxide fluoride.
Rhenium trioxide fluoride can be prepared by fluorination of rhenium trioxide:
With Lewis bases (L) the compound forms adducts with the formula , e.g., L = diethyl ether and acetonitrile.
According to X-ray crystallography, the compound adopts a helical chain structure featuring octahedral Re centers linked by two fluoride and two oxide bridging ligands. In contrast with , and crystallize with simpler structures. The Mn compound crystallizes as a tetrahedral monomer. The technetium compound crystallizes as dimers with fluoride bridges. Also contrasting with the structure of rhenium trioxide fluoride is that of rhenium trioxide chloride, which is a monomer.