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Fluoromethylidyne: Wikis


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IUPAC name
Other names Monofluoromethane, Methyl fluoride, Fluoromethylidyne, Freon 41, Halocarbon 41, R41, UN 2454
CAS number 593-53-3 Yes check.svgY
PubChem 11638
EC number 209-796-6
KEGG C11147
ChEBI 28826
Molecular formula CH3F
Molar mass 34.03 g/mol
Appearance Colorless, odorless gas
Density 0.5786 kg/m3 at 20 °C

0.557 g/cm3 (liquid) at saturation pressure at 25 °C

Melting point

131.4 K (-141.8 °C)

Boiling point

195.0 K (-78.2 °C)

Solubility in water 1.66 l/kg (2.295 g/l)
Vapor pressure 3.3 MPa
EU classification Very flammable (F+)
R-phrases R12
S-phrases S9, S16, S23, S24/25, S26, S28, S33, S36/37/39, S60
NFPA 704
NFPA 704.svg
 Yes check.svgY (what is this?)  (verify)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Fluoromethane, also known as methyl fluoride, Freon 41, Halocarbon-41 and HFC-41, is a non-toxic, liquefiable, and flammable gas at standard temperature and pressure. It is made of carbon, hydrogen, and fluorine. The name stems from the fact that it is methane (CH4) plus fluorine, minus a hydrogen.It is used in the manufacture of semiconductor and electronic products. In the presence of an RF field fluoromethane will dissociate into fluoride ions that selectively etch silicon compound films (reactive-ion etching).

Bond energy of C-F is 552 kJ/mol and its length is 0.139 nm (typically 0.14 nm).

Its specific heat capacity is Cp = 38.171 J.mol-1.K-1 at 25 °C. Critical point of fluoromethane is at 44.9 °C (318.1 K) and 6.280 MPa. Its global warming potential is GWP = 150.

External links


ChemSpider 10605706 Y
InChI key
Molecular formula CF
Molar mass 31.01 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Fluoromethylidyne is a metastable trivalent radical with the formula CF.[1]

Ground-state fluoromethylidyne radicals can be produced by the ultraviolet photodissociation of dibromodifluoromethane at 248 nanometer wavelength.[2]

It irreverably readily dimerises to difluoroethyne, also known as di- or perfluoroacetylene, or di- or perfluoroethylyne. Under certain conditions it can polymerise to hexafluorobenzene.


  1. ^ F. J. Grieman, A. T. Droege, and P. C. Engelking (March 1983). [Expression error: Unexpected < operator "The a4Σ-X22Π transition in CF: A measurement of the term energy and bond length of a fluoromethylidyne metastable"]. Journal of Chemical Physics 78 (5): 2248-2254. 
  2. ^ J. Peeters, J. Van Hoeymissen, S. Vanhaelemeersch, and D. Vermeylen (February 1992). [Expression error: Unexpected < operator "Absolute rate constant measurements of fluoromethylidyne (X2.PI.) reactions. 1. Reactions with oxygen, fluorine, chlorine and nitric oxide"]. Journal of Physical Chemistry 96 (3): 1257-1263. 


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