1,2-Dichloro-1,1,2-trifluoroethane
Chemical compound
From Wikipedia, the free encyclopedia
1,2-Dichloro-1,1,2-trifluoroethane is a volatile liquid chlorofluoroalkane composed of carbon, hydrogen, chlorine and fluorine, and with structural formula CClF2CHClF. It is also known as a refrigerant with the designation R-123a.[1]
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| Names | |
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| Preferred IUPAC name
1,2-Dichloro-1,1,2-trifluoroethane | |
| Other names
R-123a | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.005.955 |
| EC Number |
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PubChem CID |
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| UNII | |
| UN number | 3163 1078 |
CompTox Dashboard (EPA) |
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| Properties | |
| C2HCl2F3 | |
| Molar mass | 152.93 g·molâ1 |
| Density | 1.50 |
| Melting point | â78.0 °C (â108.4 °F; 195.2 K) |
| Boiling point | 29.5 °C (85.1 °F; 302.6 K) |
| Vapor pressure | 620.01 mmHg |
Henry's law constant (kH) |
9.55Ã10â2 atm-cu m/mole |
Refractive index (nD) |
1.327 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Formation
1,1,2-Trichloro-1,2,2-trifluoroethane can be biotransformed in sewage sludge to 1,2-dichloro-1,1,2-trifluoroethane.[2]
It can be made from the reaction of tetrachloroethylene with hydrogen fluoride as a byproduct of HCFC-123 synthesis.[3]
Properties
The critical temperature of R-123a is 461.6 K (188.5 °C; 371.2 °F).[4] The rotation of the molecule appears to be hindered by the present of chlorine on each carbon atom, but is eased at higher temperatures.[4]
Use
Although not deliberately used, R-123a is a significant impurity in its isomer, the widely used 2,2-dichloro-1,1,1-trifluoroethane (R-123).[4]
