Chlorofluoromethane
{{Use dmy dates|date=February 2021}}
{{chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 460032038
| ImageFileL1 = Chlorofluoromethane.png
| ImageSizeL1 = 120px
| ImageFileR1 = Chlorofluoromethane-3D-vdW.png
| ImageSizeR1 = 121px
| PIN = Chloro(fluoro)methane
| OtherNames = Chlorofluoromethane
Fluorochloromethane
Chloro-fluoro-methane
Methylene chloride fluoride
Monochloromonofluoromethane
CFM
Khladon 31
Freon 31
HCFC 31
R 31
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 11153
| InChIKey = XWCDCDSDNJVCLO-UHFFFAOYAV
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/CH2ClF/c2-1-3/h1H2
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = XWCDCDSDNJVCLO-UHFFFAOYSA-N
| CASNo_Ref = {{cascite|changed|??}}
| CASNo = 593-70-4
| EINECS = 209-803-2
| PubChem = 11643
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = CUM8OUO53E
| SMILES = C(F)Cl
| KEGG_Ref = {{keggcite|changed|kegg}}
| KEGG = C19362
| InChI = 1/CH2ClF/c2-1-3/h1H2
}}
|Section2={{Chembox Properties
| Formula = CH2ClF
| MolarMass = 68.48 g/mol
| Appearance = Gas
| Density = 1.271 kg/m3 at 20 °C
| MeltingPtC = -133.0
| BoilingPtC = -9.1
| Solubility =
| HenryConstant = 0.15 mol.kg−1.bar−1
}}
|Section3={{Chembox Hazards
| MainHazards = Carc. Cat. 3
| FlashPt =
| AutoignitionPt =
}}
}}
Chlorofluoromethane or Freon 31 is the hydrochlorofluorocarbon (HCFC) with the formula CH2ClF. It is a colorless, odorless, flammable gas. It is a class II ozone depleting substance and in accordance with the montreal protocol, its production and import were banned on 1 January 2015.{{Cite web |last=US EPA |first=OAR |date=2015-07-22 |title=Phaseout of Class II Ozone-Depleting Substances |url=https://www.epa.gov/ods-phaseout/phaseout-class-ii-ozone-depleting-substances |access-date=2024-08-29 |website=www.epa.gov |language=en}}
Uses
Pyrolysis of a mixture of dichlorofluoromethane and chlorofluoromethane gives hexafluorobenzene:{{Ullmann | last1= Dagani|first1=M. J. | last2= Barda|first2=H. J. | last3 = Benya|first3=T. J. | last4= Sanders|first4=D. C. | title = Bromine Compounds | doi = 10.1002/14356007.a04_405 }}
:3 CHCl2F + 3 CH2ClF → C6F6 + 9 HCl
It was used as a refrigerant and has an ozone depletion potential of 0.02.
Additional data
Its crystal structure is monoclinic with space group P21 and lattice constants a = 6.7676, b = 4.1477, c = 5.0206 (0.10−1 nm), β = 108.205°.
{{cite journal
|author1=Binbrek O. S. |author2=Torrie B. H. |author3=Swainson I. P. | year = 2002
| title = Neutron powder-profile study of chlorofluoromethane
| journal = Acta Crystallographica C
| volume = 58 | issue = 11 | pages = 672–674
| pmid = 12415178
| doi = 10.1107/S0108270102017328
|bibcode=2002AcCrC..58O.672B |s2cid=6646254 }}
At an altitude of 22 km, traces of chlorofluoromethane occur (148 ppt).
{{cite journal
| author = C. Lippens
| year = 1981
| title = Atmospheric nitric acid and chlorofluoromethane 11 from interferometric spectra obtained at the Observatoire du Pic du Midi
| journal=Journal of Optics
| volume = 12 | issue = 5 | pages = 331–336
| doi = 10.1088/0150-536X/12/5/007
| bibcode = 1981JOpt...12..331L
| display-authors=etal}}
References
External links
- [http://www.chemnet.ru/rus/handbook/ivtan/231.html Thermochemical table at chemnet.ru]
- [https://web.archive.org/web/20080920112852/http://nvl.nist.gov/pub/nistpubs/jres/045/3/V45.N03.A03.pdf Infrared Spectrum of Chlorofluoromethane]
- IARC Summaries & Evaluations: [http://www.inchem.org/documents/iarc/vol41/chlorofluoromethane.html Vol. 41 (1986)], [http://www.inchem.org/documents/iarc/vol71/076-chlorofluormeth.html Vol. 71 (1999)]
{{Halomethanes}}
Category:Hydrochlorofluorocarbons
Category:IARC Group 3 carcinogens