Chloryl fluoride

Chloryl fluoride
Chloryl fluoride
CAS number 13637-83-7
Molecular formula ClO2F
Molar mass 86.4502 g/mol
Density 3.534 g/L
Melting point

-15 °C

Boiling point

-6 °C

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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

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



ClO2F was first reported by Schmitz and Schumacheb in 1942, who prepared it by the fluorination of ClO2.[2] The compound is more conveniently prepared by treatment of sodium chlorate and chlorine trifluoride 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.


  1. ^ Chrisie, K. O.; Wilson, R. D.; Schack, C. J. "Chloryl fluoride" Inorganic Syntheses, 1986, volume 24, pages 3-5. ISBN 0-471-83441-6
  2. ^ Schmitz, H.; Schumacheb, H. J. "Über eine neue Reaktion des Chlordioxyds. Die Bildung einer Verbindung der Formel ClO2F" Zeitschrift für anorganische und allgemeine Chemie 1942, Volume 249, Pages 238 - 244. DOI 10.1002/zaac.19422490302

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