Fluoromethane

Names IUPAC name Other names Identifiers Abbreviations R41 1730725 ChEBI ChEMBL ChemSpider ECHA InfoCard 100.008.907 Edit this at Wikidata EC Number 391 KEGG MeSH Fluoromethane UNII UN number UN 2454 Properties CH₃F Molar mass 34.03 g/mol Appearance Colourless gas Odor pleasant, ether-like odour at high concentrations Density 1.4397 g/L

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

Melting point −137.8 °C (−216.0 °F; 135.3 K)^[1] Boiling point −78.4 °C (−109.1 °F; 194.8 K)^[1] 1.66 L/kg (2.295 g/L) Vapor pressure 3.3 MPa Hazards GHS labelling: GHS02: Flammable Danger H220 P210, P377, P381, P403, P410+P403 NFPA 704 (fire diamond)

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) with a fluorine atom substituted for one of the hydrogen atoms. It is used in semiconductor manufacturing processes as an etching gas in plasma etch reactors.^[2]

Fluoromethane (originally called "fluorohydrate of methylene") became the first organofluorine compound to be discovered^[3] when it was synthesized by French chemists Jean-Baptiste Dumas and Eugène-Melchior Péligot in 1835 by distilling dimethyl sulfate with potassium fluoride.^[4]

The compound is the lowest mass member of the hydrofluorocarbon (HFC) family, compounds which contain only hydrogen, fluorine, and carbon. These compounds are related to the chlorofluorocarbons (CFC), but since they do not contain chlorine, are not destructive to the ozone layer.^[5] Fluorocarbons are, however, potent greenhouse gasses, and the Kigali Amendment to the Montreal Protocol is an attempt to phase them out due to their contribution to global warming.^[6]

The C−F bond energy is 552 kJ/mol and its length is 0.139 nm. Its molecular geometry is tetrahedral. Its Dipole Moment is 1.85 D.^{[citation needed ]}

Its specific heat capacity (C_p) is 38.171 J·mol⁻¹·K⁻¹ at 25 °C. The critical point of fluoromethane is at 44.9 °C (318.1 K) and 6.280 MPa.

• Organofluorine chemistry
• Halomethanes

• Thermochemical data at chemnet.ru