Carbonyl fluoride

  • Carbonoxyfluorid
  • Carbondifluoridoxid
  • Difluorformaldehyd
  • Fluorophosgene
  • Kohlensäuredifluorid

Colorless, hygroscopic gas with a pungent odor

Gaseous

  • 2.97 kg · m -3 (gaseous, 0 ° C)
  • 1.81 g · cm -3 (liquid at boiling point )

-114.0 ° C

-84.6 ° C

Hydrolysis in water

Risk

-639.8 KJ / mol

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Carbonyl fluoride is the most common name for Kohlenoxiddifluorid, CF 2 O, the difluoride of carbonic acid. It is the fluoro analogue of phosgene.

Properties

Carbonyl fluoride is a toxic, pungent gas, which fumes in the air due to its hygroscopic nature. It is well soluble in organic solvents (eg, benzene, toluene, chlorobenzene, and others), it dissolves in water with rapid decomposition to carbon dioxide and hydrofluoric acid, which is why the organic solvents must be anhydrous, these are used for synthesis or for working with carbonyl are:

Representation

Carbonyl usually arises as a decomposition product of fluorinated hydrocarbons during their thermal decomposition, such as trifluoromethanol or tetrafluoro methane in the presence of water:

It can also be synthesized from carbon monoxide and fluorine:

Use

Carbonyl fluoride has been proposed as a new etching gas in the semiconductor industry and for the cleaning of CVD reactors. On a laboratory scale, it can be used for fluoride syntheses, as it is very easy with the release of the fluorine atoms absorbs oxygen and carbon dioxide reacts to continue.

Toxic effect

Carbonyl fluoride is irritating when inhaled skin, eyes and respiratory tract. To the eyes and skin, there is pain, redness, severe burns and visual impairments caused by removal of the water from the tissue and in addition by the resulting hydrogen fluoride. Upon contact with liquid carbonyl arise frostbite. After prolonged absorption through the respiratory tract if the patient has a sore throat, cough, and dyspnea. The symptoms may be delayed. As a result, a worst inhalation toxic pulmonary edema occur. This is with cortisone, in any case, preclinical, to treat.

CAS registry number Dangerous Substances Directive (67/548/EEC) Structural analog CRC Handbook of Chemistry and Physics
163837
de