rhenium dioxide trifluoride

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| ImageFile = ReO2F3.svg

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|Section1={{Chembox Identifiers

| CASNo = 57246-89-6

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| StdInChI=1S/3FH.2O.Re/h3*1H;;;/q;;;;;+3/p-3

| StdInChIKey=MVRQLRVXKVDVMG-UHFFFAOYSA-K

| SMILES = O=[Re](F)(F)(F)=O

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|Section2={{Chembox Properties

| Re = 1|O=2|F=3

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| Appearance = white

| Density = 5.161 g/cm³

| MeltingPtF = 95

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Rhenium dioxide trfluoride is an inorganic compound with the formula {{chem2|ReO2F3}}. A white diamagnetic solid, it one of the few oxyfluorides of rhenium, another being rhenium trioxide fluoride, {{chem2|ReO3F}}. The material is of some academic interest as a rare example of an dioxide trifluoride.{{Greenwood&Earnshaw2nd}} It can be prepared by the reaction of xenon difluoride and rhenium trioxide chloride:

:{{chem2|2 ReO3Cl + 3 XeF2 -> 2 ReO2F3 + O2 + Cl2 + 3 Xe}}

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 {{chem2|(ReO2F3)3}} and {{chem2|(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 {{chem2|ReO2F3L}} where L = acetonitrile have been crystallized.{{cite journal |doi=10.1002/zaac.200500239 |title=Preparation and Structure of Rhenium Fluoride Trioxide ReO₃F, and the Polymorphism of Rhenium Trifluoride Dioxide, ReO₂F₃ |year=2005 |last1=Supeł |first1=Joanna |last2=Marx |first2=Rupert |last3=Seppelt |first3=Konrad |journal=Zeitschrift für anorganische und allgemeine Chemie |volume=631 |issue=15 |pages=2979–2986 }}