Title: Fluoromethane
CAS Registry Number: 593-53-3
Additional Names: Methyl fluoride
Molecular Formula: CH3F
Molecular Weight: 34.03
Percent Composition: C 35.29%, H 8.89%, F 55.83%
Literature References: Prepn in 82% yield by heating fluorosulfonic acid methyl ester with KF: Zappel, Jonas, DE 1131197 (1962 to Bayer).
Properties: Gas. Agreeable ether-like odor. Burns with evolution of HF, the flame being about as colorless as that of alc: Dumas, Peligot, Ann. 15, 59 (1835). d (liq; -78°) 0.8774. d (gas) 1.1951 (air = 1); d (gas) 1.0813 (oxygen = 1). Dipole moment 1.81. Molecular volume: 22.03. Van der Waals constants: 0.00923; 0.002350. Critical temp 44.9°; crit press. 62.0 atm. Dielectric constant (for wavelengths below 104 cm) = 1.00948. mp -141.8°. bp872 -75.7°; bp760 -78.2°. bp143 -103.7°. One hundred vols of water dissolve 166 vols of the gas at 15°. Freely sol in alcohol, ether.
Melting point: mp -141.8°
Boiling point: bp872 -75.7°; bp760 -78.2°; bp143 -103.7°
Density: d (liq; -78°) 0.8774; d (gas) 1.1951 (air = 1); d (gas) 1.0813 (oxygen = 1)
CAUTION: Narcotic in high concns.
Fluorometholone Fluorosalan Fluorosulfonic Acid Fluorotoluene Fluorouracil

Stick model of fluoromethane Spacefill model of fluoromethane
Abbreviations R41
CAS number 593-53-3 YesY, 558-21-4 (2H3YesY, 20666-44-8 (13CYesY
PubChem 11638 (2H3YesY, 450707 (11CYesY, 12336970 (13CYesY, 9833918 (17F), 450725 (18FYesY, 11638 YesY
ChemSpider 11148 (2H3) YesY, 396977 (11CYesY, 21170290 (13CYesY, 8009639 (17FYesY, 396995 (18FYesY, 11148 YesY
EC number 209-796-6
UN number UN 2454
KEGG C11147 YesY
MeSH Fluoromethane
ChEBI CHEBI:28826 YesY
Beilstein Reference 1730725
Gmelin Reference 391
Jmol-3D images Image 1
Molecular formula CH3F
Molar mass 34.03 g/mol
Appearance Colorless, odorless gas
Density 1.4397 g/L

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
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 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) with a fluorine atom substituted for one of the hydrogen atoms. 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).

Fluoromethane has an agreeable ether-like odor and is also narcotic in high concentrations. Fluoromethane is highly flammable and burns in air with evolution of highly toxic hydrogen fluoride. The flame is colorless, similar to alcohol.

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

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.