Carbonyl fluoride

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Carbonyl fluoride
Structure of carbonyl fluoride Space-filling model of the carbonyl fluoride molecule
CAS number 353-50-4 YesY
ChemSpider 9246 YesY
UN number 2417
RTECS number FG6125000
Jmol-3D images Image 1
Molecular formula COF2
Molar mass 66.01 g mol−1
Appearance Colorless gas
Density 2.698 g dm−3 (gas), 1.139 g dm−3 (liquid at melting point)
Melting point −111.26 °C (−168.27 °F; 161.89 K)
Boiling point −84.57 °C (−120.23 °F; 188.58 K)
Molecular shape C2v
Dipole moment 0.95 D
Main hazards Highly toxic (Often fatal), Water reactive
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 4: Very short exposure could cause death or major residual injury. E.g., VX gas Reactivity code 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g., phosphorus Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point Non-flammable
Related compounds
Related compounds Phosgene
Carbonyl bromide
Formyl fluoride
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

Carbonyl fluoride is the inorganic compound with the formula COF2. This gas, like its analog phosgene, is colourless and highly toxic. The molecule is planar with C2v symmetry.

Preparation and properties[edit]

Carbonyl fluoride can be prepared by reaction of phosgene with hydrogen fluoride and the oxidation of carbon monoxide, although the latter tends to result in over-oxidation to carbon tetrafluoride. The oxidation of carbon monoxide with silver difluoride is convenient:

CO + 2 AgF2 → COF2 + 2 AgF

Carbonyl fluoride is unstable in the presence of water, hydrolyzing to carbon dioxide and hydrogen fluoride.[1]


Carbonyl fluoride is extremely poisonous with a threshold limit value of 2 ppm for short-term exposure.[2]


  1. ^ M. W. Farlow, E. H. Man, C. W. Tullock (1960). "Carbonyl Fluoride". Inorganic Syntheses 6: 155–158. doi:10.1002/9780470132371.ch48. 
  2. ^ "Carbonyl Fluoride". NIOSH Pocket Guide to Chemical Hazards. CDC Centers for Disease Control and Prevention. Retrieved 2013-09-10.