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 =

}}

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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