Dichlorodifluoromethane
- Formula: CCl2F2
- Molecular weight: 120.914
- IUPAC Standard InChI: InChI=1S/CCl2F2/c2-1(3,4)5
- IUPAC Standard InChIKey: PXBRQCKWGAHEHS-UHFFFAOYSA-N
- CAS Registry Number: 75-71-8
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Methane, dichlorodifluoro-; Algofrene Type 2; Arcton 12; Arcton 6; Chlorofluoromethane (CCl2F2); Difluorodichloromethane; Electro-CF 12; F 12; Freon 12; Frigen 12; FC 12; Genetron 12; Isceon 122; Isotron 12; Ledon 12; R 12; R 12, Refrigerant; Refrigerant 12; CF2Cl2; Fluorocarbon 12; Propellant 12; Dwuchlorodwufluorometan; Eskimon 12; Freon F-12; Kaiser chemicals 12; Rcra waste number U075; Ucon 12; Ucon 12/halocarbon 12; UN 1028; CCl2F2; Halon 122; CFC-12; Halocarbon 12; Isotron 2; Propellent 12; Refrigerant R12; Chlorofluorocarbon 12; Dymel 12; FCC 12; FKW 12; Forane 12
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Condensed phase thermochemistry data
Go To: Top, Gas phase ion energetics data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing
Constant pressure heat capacity of liquid
| Cp,liquid (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 126.8 | 290. | Buffington and Fleischer, 1931 | Heat capacity measured at 230 K and 290 K using two different methods. Cp at 230 K is 106.3 J/mol*K. |
Gas phase ion energetics data
Go To: Top, Condensed phase thermochemistry data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data evaluated as indicated in comments:
L - Sharon G. Lias
Data compiled as indicated in comments:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| IE (evaluated) | 12.0 ± 0.2 | eV | N/A | N/A | L |
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 0.40 ± 0.20 | NBIE | Dispert and Lacmann, 1978 | B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 12.26 ± 0.02 | PI | Kischlat and Morgner, 1985 | LBLHLM |
| 11.87 ± 0.02 | PI | Wang and Leroi, 1983 | LBLHLM |
| 11.75 | PI | Jochims, Lohr, et al., 1976 | LLK |
| 11.75 ± 0.04 | PI | Ajello, Huntress, et al., 1976 | LLK |
| 12.31 ± 0.05 | PI | Watanabe, Nakayama, et al., 1962 | RDSH |
| 11.7 ± 0.5 | EI | Baker and Tate, 1938 | RDSH |
| 12.24 ± 0.01 | PE | Jadrny, Karlsson, et al., 1977 | Vertical value; LLK |
| 12.3 | PE | Doucet, Sauvageau, et al., 1973 | Vertical value; LLK |
Appearance energy determinations
References
Go To: Top, Condensed phase thermochemistry data, Gas phase ion energetics data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Buffington and Fleischer, 1931
Buffington, R.M.; Fleischer, J.,
Thermodynamic properties of dichlorodifluoromethane, a new refrigerant. IV. Specific heat of liquid and vapor and latent heat of vaporization,
Ind. Eng. Chem., 1931, 23, 1290-1292. [all data]
Dispert and Lacmann, 1978
Dispert, H.; Lacmann, K.,
Negative ion formation in collisions between potassium and fluoro- and chloromethanes: Electron affinities and bond dissociation energies,
Int. J. Mass Spectrom. Ion Phys., 1978, 28, 49. [all data]
Kischlat and Morgner, 1985
Kischlat, W.; Morgner, H.,
Comparative study of He(23S)-penning ionization and He(I) photoionization of CF4, CCl4, and the chlorofluoromethanes by electron-ion coincidence,
J. Electron Spectrosc. Relat. Phenom., 1985, 35, 273. [all data]
Wang and Leroi, 1983
Wang, F.C.-Y.; Leroi, G.E.,
Photoionization and fragmentation of halogenated methanes,
Ann. Isr. Phys. Soc., 1983, 6, 210. [all data]
Jochims, Lohr, et al., 1976
Jochims, H.-W.; Lohr, W.; Baumgartel, H.,
Photoreactions of small organic molecules V. Absorption-, photoion- and resonancephotoelectron-spectra of CF3Cl, CF2Cl2, CFCl3 in the energy range 10-25 eV,
Ber. Bunsen-Ges. Phys. Chem., 1976, 80, 130. [all data]
Ajello, Huntress, et al., 1976
Ajello, J.M.; Huntress, W.T., Jr.; Rayermann, P.,
A photoionization mass spectrometer study of CFCl3, CF2Cl2 and CF3Cl,
J. Chem. Phys., 1976, 64, 4746. [all data]
Watanabe, Nakayama, et al., 1962
Watanabe, K.; Nakayama, T.; Mottl, J.,
Ionization potentials of some molecules,
J. Quant. Spectry. Radiative Transfer, 1962, 2, 369. [all data]
Baker and Tate, 1938
Baker, R.F.; Tate, J.T.,
Ionization and dissociation by electron impact in CCl2F2 and in CCl4 vapor,
Phys. Rev., 1938, 53, 683. [all data]
Jadrny, Karlsson, et al., 1977
Jadrny, R.; Karlsson, L.; Mattsson, L.; Siegbahn, K.,
Valence electron spectra of the chlorofluoromethanes CF3Cl, CF2Cl2 and CFCl3,
Phys. Scr., 1977, 16, 235. [all data]
Doucet, Sauvageau, et al., 1973
Doucet, J.; Sauvageau, P.; Sandorfy, C.,
Vacuum ultraviolet and photoelectron spectra of fluoro-chloro derivatives of methane,
J. Chem. Phys., 1973, 58, 3708. [all data]
Zayats, Perov, et al., 1985
Zayats, A.Yu.; Perov, A.A.; Simonov, A.P.,
Formation of long-lived Rydberg atoms upon excitation of NF3 and CF2Cl2 molecules by electron impact,
Sov. J. Chem. Phys., 1985, 2, 1906. [all data]
Schenk, Oertel, et al., 1979
Schenk, H.; Oertel, H.; Baumgartel, H.,
Photoreactions of small organic molecules VII Photoionization studies on the ion-pair formation of the fluorochloromethanes CF2Cl2, CF3Cl, and CFCl3,
Ber. Bunsen-Ges. Phys. Chem., 1979, 83, 683. [all data]
Leyland, Majer, et al., 1970
Leyland, L.M.; Majer, J.R.; Robb, J.C.,
Heat of formation of the CF2Cl. radical,
J. Chem. Soc. Faraday Trans., 1970, 66, 898. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy Cp,liquid Constant pressure heat capacity of liquid EA Electron affinity IE (evaluated) Recommended ionization energy - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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