1,2-difluoroethane
Structural formula | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
General | ||||||||||||||||
Surname | 1,2-difluoroethane | |||||||||||||||
other names |
HFC-152 |
|||||||||||||||
Molecular formula | C 2 H 4 F 2 | |||||||||||||||
External identifiers / databases | ||||||||||||||||
|
||||||||||||||||
properties | ||||||||||||||||
Molar mass | 66.05 g mol −1 | |||||||||||||||
Physical state |
liquid |
|||||||||||||||
density |
0.913 g cm −3 (19 ° C) |
|||||||||||||||
Melting point |
−104 ° C |
|||||||||||||||
boiling point |
26 ° C |
|||||||||||||||
solubility |
easily soluble in benzene and chloroform |
|||||||||||||||
Refractive index |
1.28 (25 ° C) |
|||||||||||||||
safety instructions | ||||||||||||||||
Global warming potential |
20 (based on 100 years) |
|||||||||||||||
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C |
1,2-Difluoroethane is a chemical compound from the group of fluorocarbons .
Extraction and presentation
1,2-Difluoroethane can be obtained by reacting ethene with fluorine . Another method of preparation is the addition of fluorine to ethene using xenon difluoride , although a product mixture of 45% 1,2-difluoroethane, 35% 1,1-difluoroethane and 1,1,2-trifluoroethane is formed.
properties
1,2-Difluoroethane is a liquid that is readily soluble in benzene and chloroform . It is mainly in the cis form. In a solid form near its melting point, the compound has a monoclinic crystal structure with the space group C 2 / m (space group no.12) , while a second form with an orthorhombic crystal structure with the space group space group P 2 1 2 1 2 1 (space group no . 19) exists.
use
1,2-Difluoroethane was used as the refrigerant .
Individual evidence
- ↑ a b c d William M. Haynes: CRC Handbook of Chemistry and Physics, 94th Edition . CRC Press, 2016, ISBN 978-1-4665-7115-0 , pp. 67 ( limited preview in Google Book search).
- ↑ a b Entry on 1,2-difluoroethane in the Hazardous Substances Data Bank , accessed on March 4, 2018.
- ↑ a b Floris Akkerman, Jürgen Buschmann, Dieter Lentz, Peter Luger, Eva Rödel: Crystal and molecular structure of 1,2-difluoroethane and 1,2-diiodoethane. In: Journal of Chemical Crystallography . 33, pp. 969-975, doi : 10.1023 / A: 1027494101785 .
- ↑ a b synquestlabs: 1,2-Difluoroethane , accessed on November 5, 2019
- ↑ G. Myhre, D. Shindell et al .: Climate Change 2013: The Physical Science Basis . Working Group I contribution to the IPCC Fifth Assessment Report. Ed .: Intergovernmental Panel on Climate Change . 2013, Chapter 8: Anthropogenic and Natural Radiative Forcing, pp. 24-39; Table 8.SM.16 ( PDF ).
- ↑ RH Hauge, S. Gransden, JLF Wang, JL Margrave: Studies of the reactions of molecular fluorine with methane, acetylene, ethylene, allene, and other small hydrocarbons in matrices at low temperatures. In: Journal of the American Chemical Society . 101, 1979, pp. 6950-6954, doi : 10.1021 / ja00517a027 .
- ↑ e-EROS Encyclopedia of Reagents for Organic Synthesis , 1999–2013, John Wiley and Sons, Inc., entry for Xenon (II) fluoride, accessed January 20, 2018 .
- ↑ Yang, N.-C .; Shieh, T.-C .; Feit, ED; Chernick, CL: Reactions of xenon fluorides with organic compounds ; in: J. Org. Chem. 35, 1970, pp. 4020-4024, doi : 10.1021 / jo00837a001 .
- ↑ Peer Kirsch: Modern Fluoroorganic Chemistry Synthesis, Reactivity, Applications . John Wiley & Sons, 2006, ISBN 978-3-527-60419-7 , pp. 243 ( limited preview in Google Book search).
- ↑ Alexander V. Benderskii, Charles A. Wight: Conformational Isomerization of 1,2-Difluoroethane in Solid Argon: Cage-Modified Reaction Barriers. In: The Journal of Physical Chemistry . 100, 1996, pp. 14958-14961, doi : 10.1021 / jp961519d .