Rhenium trioxide fluoride

Rhenium trioxide fluoride is an inorganic compound with the formula ReO₃F. 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 ReO₂F₃ . The material has no applications, but it is of some academic interest as a rare example of a trioxide fluoride.

Rhenium trioxide fluoride

Identifiers
CAS Number	42246-24-2
3D model (JSmol)	Interactive image
InChI InChI=1S/FH.3O.Re/h1H;;;;/q;;;;+1/p-1 Key: YDGWOHYNESLUAQ-UHFFFAOYSA-M
SMILES O=[Re](=O)(=O)F
Properties
Chemical formula	FO3Re
Molar mass	253.202 g·mol−1
Appearance	white
Density	6.042 g/cm3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis and reactions

Rhenium trioxide fluoride can be prepared by fluorination of rhenium trioxide:^[1]

2 ReO₃ + F₂ → 2ReO₃F

With Lewis bases (L) the compound forms adducts with the formula ReO₃FL₂, e.g., L = diethyl ether and acetonitrile.^[1]

Structure and related compounds

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 ReO₃F, TcO₃F and MnO₃F crystallize with simpler structures. The Mn compound crystallizes as a tetrahedral monomer. The technetium compound TcO₃F crystallizes as dimers with fluoride bridges.^[2] Also contrasting with the structure of rhenium trioxide fluoride is that of rhenium trioxide chloride, which is a monomer.