Chloryl fluoride is the chemical compound with the formula ClO₂F. It is commonly encountered as side-product in reactions of chlorine fluorides with oxygen sources.^[1] It is the acyl fluoride of chloric acid.

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Chloryl fluoride

Names
Other names chlorine dioxide fluoride
Identifiers
CAS Number	13637-83-7 Y
3D model (JSmol)	Interactive image
ChemSpider	123044 N
PubChem CID	139523
CompTox Dashboard (EPA)	DTXSID00159769
InChI InChI=1S/ClFO2/c2-1(3)4 N Key: YVRLYFHVJLYEHM-UHFFFAOYSA-N N InChI=1/ClFO2/c2-1(3)4 Key: YVRLYFHVJLYEHM-UHFFFAOYAO
SMILES FCl(=O)=O
Properties
Chemical formula	ClFO2
Molar mass	86.45 g·mol−1
Density	3.534 g/L
Melting point	−115 °C
Boiling point	−6 °C
Related compounds
Related compounds	Perchloryl fluoride Chloryl trifluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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ClO₂F was first reported by Schmitz and Schumacher in 1942, who prepared it by the fluorination of ClO₂.^[2] The compound is more conveniently prepared by reaction of sodium chlorate and chlorine trifluoride^[3] and purified by vacuum fractionation, i.e. selectively condensing this species separately from other products. This species is a gas boiling at −6 °C:

6 NaClO₃ + 4 ClF₃ → 6 ClO₂F + 2 Cl₂ + 3 O₂ + 6 NaF

In contrast to O₂F₂, ClO₂F is a pyramidal molecule. This structure is predicted by VSEPR. The differing structures reflects the greater tendency of chlorine to exist in positive oxidation states with oxygen and fluorine ligands. The related Cl-O-F compound perchloryl fluoride, ClO₃F, is tetrahedral. The related bromine compound bromyl fluoride (BrO₂F) adopts the same structure as ClO₂F, whereas iodyl fluoride (IO₂F) forms a polymeric substance under standard conditions.^[4]