1,2-Dichloro-1,1,2-trifluoroethane

1,2-Dichloro-1,1,2-trifluoroethane
Names
	Preferred IUPAC name 1,2-Dichloro-1,1,2-trifluoroethane
	Other names R-123a
Identifiers
CAS Number	354-23-4;
3D model (JSmol)	Interactive image;
ChemSpider	9254;
ECHA InfoCard	100.005.955
EC Number	206-549-4;
PubChem CID	9631;
UNII	K8CR1MEG1D;
UN number	3163 1078
CompTox Dashboard (EPA)	DTXSID1042021 ;
	InChI InChI=1S/C2HCl2F3/c3-1(5)2(4,6)7/h1H Key: YMRMDGSNYHCUCL-UHFFFAOYSA-N;
	SMILES C(C(F)(F)Cl)(F)Cl;
Properties
Chemical formula	C2HCl2F3
Molar mass	152.93 g·mol−1
Density	1.50
Melting point	−78.0 °C (−108.4 °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)	9.55×10−2 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). Infobox references

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]

Formation edit

1,1,2-Trichloro-1,2,2-trifluoroethane can be biotransformed in sewage sludge to 1,2-dichloro-1,1,2-trifluoroethane.^[2]

Properties edit

The critical temperature of R-123a is 461.6 K (188.5 °C; 371.2 °F).^[3] The rotation of the molecule appears to be hindered by the present of chlorine on each carbon atom, but is eased at higher temperatures.^[3]

Use edit

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).^[3]

References edit

^ Kubota, H.; Yamashita, T.; Tanaka, Y.; Makita, T. (May 1989). "Vapor pressures of new fluorocarbons". International Journal of Thermophysics. 10 (3): 629–637. Bibcode:1989IJT....10..629K. doi:10.1007/BF00507984. S2CID 122499503.
^ Christian Balsiger; David Werner; Christof Holliger; Patrick Höhener (10 January 2005). "Reductive dechlorination of CFCs and HCFCs under methanogenic conditions" (PDF). Archived from the original (PDF) on 15 July 2020. Retrieved 15 July 2020.
^ ^a ^b ^c Goodwin, A. R. H.; Moldover, M. R. (October 1991). "Thermophysical properties of gaseous refrigerants from speed-of-sound measurements. III. Results for 1,1-dichloro-2,2,2-trifluoroethane (CHCl₂-CF₃) and 1,2-dichloro-1,2,2-trifluoroethane (CHClF-CClF₂)". The Journal of Chemical Physics. 95 (7): 5236–5242. Bibcode:1991JChPh..95.5236G. doi:10.1063/1.461831.

External links edit

OKADA, Masaaki (2 December 1995). "代替冷媒の表面張力" [Surface Tension of Alternative Refrigerants]. Trans. of the JAR (in Japanese). 12 (2): 135–145. doi:10.11322/tjsrae.12.135.

[1] Kubota, H.; Yamashita, T.; Tanaka, Y.; Makita, T. (May 1989). "Vapor pressures of new fluorocarbons". International Journal of Thermophysics. 10 (3): 629–637. Bibcode:1989IJT....10..629K. doi:10.1007/BF00507984. S2CID 122499503.

[2] Christian Balsiger; David Werner; Christof Holliger; Patrick Höhener (10 January 2005). "Reductive dechlorination of CFCs and HCFCs under methanogenic conditions" (PDF). Archived from the original (PDF) on 15 July 2020. Retrieved 15 July 2020.

[good-3] Goodwin, A. R. H.; Moldover, M. R. (October 1991). "Thermophysical properties of gaseous refrigerants from speed-of-sound measurements. III. Results for 1,1-dichloro-2,2,2-trifluoroethane (CHCl₂-CF₃) and 1,2-dichloro-1,2,2-trifluoroethane (CHClF-CClF₂)". The Journal of Chemical Physics. 95 (7): 5236–5242. Bibcode:1991JChPh..95.5236G. doi:10.1063/1.461831.

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