Rhenium dioxide trifluoride

Rhenium dioxide trfluoride is an inorganic compound with the formula ReO₂F₃. A white diamagnetic solid, it one of the few oxyfluorides of rhenium, another being rhenium trioxide fluoride, ReO₃F. The material is of some academic interest as a rare example of an dioxide trifluoride.^[1] It can be prepared by the reaction of xenon difluoride and rhenium trioxide chloride:

2 ReO₃Cl + 3 XeF₂ → 2 ReO₂F₃ + O₂ + Cl₂ + 3 Xe

Rhenium dioxide trifluoride

Identifiers
CAS Number	57246-89-6
3D model (JSmol)	Interactive image
InChI InChI=1S/3FH.2O.Re/h3*1H;;;/q;;;;;+3/p-3 Key: MVRQLRVXKVDVMG-UHFFFAOYSA-K
SMILES O=[Re](F)(F)(F)=O
Properties
Chemical formula	F3O2Re
Molar mass	275.200 g·mol−1
Appearance	white
Density	5.161 g/cm3
Melting point	35 °C; 95 °F; 308 K
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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 bridging fluoride]]s. Two other polymorphs adopt cyclic structures (ReO₂F₃)₃ and (ReO₂F₃)₄, 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 ReO₂F₃L where L = acetonitrile have been crystallized.^[2]