Dichlorodifluoromethane

• Formula: CCl₂F₂
• Molecular weight: 120.914
• IUPAC Standard InChI: InChI=1S/CCl2F2/c2-1(3,4)5 Copy

  
• IUPAC Standard InChIKey: PXBRQCKWGAHEHS-UHFFFAOYSA-N Copy
• 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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• Information on this page:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Phase change data
  • Henry's Law data
  • Gas phase ion energetics data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Vibrational and/or electronic energy levels
  • Gas Chromatography
  • References
  • Notes
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Gas phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
    C_p = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Condensed phase thermochemistry data

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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

Phase change data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos

Enthalpy of vaporization

Antoine Equation Parameters

log₁₀(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

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Henry's Law data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Rolf Sander

Henry's Law constant (water solution)

k_H(T) = k°_H exp(d(ln(k_H))/d(1/T) ((1/T) - 1/(298.15 K)))
k°_H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))
d(ln(k_H))/d(1/T) = Temperature dependence constant (K)

Gas phase ion energetics data

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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

Electron affinity determinations

Ionization energy determinations

Appearance energy determinations

IR Spectrum

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Data compiled by: Coblentz Society, Inc.

• GAS (100 mmHg, N2 ADDED, TOTAL PRESSURE 600 mmHg); DOW KBr FOREPRISM-GRATING; DIGITIZED BY COBLENTZ SOCIETY (BATCH II) FROM HARD COPY; 2 cm^-1 resolution

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

• gas

Data compiled by: Pamela M. Chu, Franklin R. Guenther, George C. Rhoderick, and Walter J. Lafferty

• gas; IFS66V (Bruker); 3-Term B-H Apodization
  0.1250, 0.2410, 0.4820, 0.9640, 1.9290 cm^-1 resolution
• gas; IFS66V (Bruker); Boxcar Apodization
  0.1250, 0.2410, 0.4820, 0.9640, 1.9290 cm^-1 resolution
• gas; IFS66V (Bruker); Happ Genzel Apodization
  0.1250, 0.2410, 0.4820, 0.9640, 1.9290 cm^-1 resolution
• gas; IFS66V (Bruker); NB Strong Apodization
  0.1250, 0.2410, 0.4820, 0.9640, 1.9290 cm^-1 resolution
• gas; IFS66V (Bruker); Triangular Apodization
  0.1250, 0.2410, 0.4820, 0.9640, 1.9290 cm^-1 resolution

Mass spectrum (electron ionization)

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Additional Data

Vibrational and/or electronic energy levels

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Takehiko Shimanouchi

Symmetry:   C_2ν     Symmetry Number σ = 2

Source: Shimanouchi, 1972

Notes

Gas Chromatography

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Normal alkane RI, non-polar column, temperature ramp

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Normal alkane RI, non-polar column, custom temperature program

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References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, Gas Chromatography, Site Links, NIST Free Links, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Kolesov, Zenkov, et al., 1963
Kolesov, V.P.; Zenkov, I.D.; Skuratov, S.M., Standard enthalpies of formation of chlorotrifluoromethane and dichlorodifluoromethane, Russ. J. Phys. Chem. (Engl. Transl.), 1963, 37, 378-379. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

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Wartenberg, H.V.; Schiefer, J., Bildungswarmen von fluor-chlor-kohlenstoff-verbindungen, Z. Anorg. Chem., 1955, 278, 326-332. [all data]

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Kirkbride, F.W.; Davidson, F.G., Heats of formation of gaseous fluoro- and fluorochloro-carbons, Nature (London), 1954, 174, 79-80. [all data]

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]

PCR Inc., 1990
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Krauss, R.; Stephan, K., Thermal Conductivity of Refrigerants in a Wide Range of Temperature and Pressure, J. Phys. Chem. Ref. Data, 1989, 18, 43. [all data]

Streng, 1971
Streng, A.G., Miscibility and Compatibility of Some Liquid and Solidified Gases at Low Temperature, J. Chem. Eng. Data, 1971, 16, 357. [all data]

Awbery and Griffiths, 1936
Awbery, J.H.; Griffiths, E., The Viscosities of Some Liquid Refrigerants, Proc. Phys. Soc. London, 1936, 48, 372-80. [all data]

Thornton, Burg, et al., 1933
Thornton, N.V.; Burg, A.B.; Schlesinger, H.I., The Behaviour of Dichlorodifluoromethane and of Chlorotrifluoromethane in the Electric Discharge, J. Am. Chem. Soc., 1933, 55, 3177. [all data]

Blanke and Weiss, 1991
Blanke, W.; Weiss, R., Thermodynamic properties of refrigerants. Part I: the triple points of the refrigerants R11, R12, R22, R142b, and 152a, PTB-Mitt., 1991, 101, 337-9. [all data]

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Altunin, V.V.; Geller, V.Z.; Kremenvskaya, E.A.; Perel'shtein, I.I.; Petrov, E.K., Thermophysical Properties of Freons, Methane Ser. Part 2, Vol. 9, NSRDS-USSR, Selover, T. B., Ed., Hemisphere, New York, 1987. [all data]

Okada, Uematsu, et al., 1986
Okada, M.; Uematsu, M.; Watanabe, K., Orthobaric liquid densities of trichloro-fluoromethane, dichlorodi-fluoromethane, chlorodifluoromethane, 1,1,2-trichlorotrifluoroethane, 1,2-dichlorotetrafluoroethane, and of the azeotropic mixtur, J. Chem. Thermodyn., 1986, 18, 527. [all data]

Higashi, Okazaki, et al., 1984
Higashi, Y.; Okazaki, S.; Takaishi, Y.; Uematsu, M.; Watanabe, K., Measurements of the Vapor-Liquid Coexistence Curve for the Binary R12 + R22 System in the Critical Region, J. Chem. Eng. Data, 1984, 29, 31-6. [all data]

Michels, Wassenaar, et al., 1966
Michels, A.; Wassenaar, T.; Wolkers, G.J.; Prins, Chr.; van de Klundert, L., P-v-t data and thermodynamical properties of freon-12 (ccl(2)f(2)) and freon-13 (cclf(3)) fluorocarbons at temperatures between 0 and 150c and at pressures up to 400 atm, J. Chem. Eng. Data, 1966, 11, 449. [all data]

Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw, Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 . [all data]

Kudchadker, Kudchadker, et al., 1979
Kudchadker, A.P.; Kudchadker, S.A.; Shukla, R.P.; Patnaik, P.R., Vapor pressures and boiling points of selected halomethanes, J. Phys. Chem. Ref. Data, 1979, 8, 2, 499, https://doi.org/10.1063/1.555600 . [all data]

Stull, 1947
Stull, Daniel R., Vapor Pressure of Pure Substances. Organic and Inorganic Compounds, Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022 . [all data]

Pearson and McConnell, 1975
Pearson, C.R.; McConnell, G., Chlorinated C1 and C2 Hydrocarbons in the Marine Environment, Proc. R. Soc. London, B, 1975, 189, 305-332. [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]

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Watanabe, K.; Nakayama, T.; Mottl, J., Ionization potentials of some molecules, J. Quant. Spectry. Radiative Transfer, 1962, 2, 369. [all data]

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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]

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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]

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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]

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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]

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Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, Gas Chromatography, Site Links, NIST Free Links, 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
  Pc	Critical pressure
  Ptriple	Triple point pressure
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  Tboil	Boiling point
  Tc	Critical temperature
  Tfus	Fusion (melting) point
  Ttriple	Triple point temperature
  d(ln(kH))/d(1/T)	Temperature dependence parameter for Henry's Law constant
  k°H	Henry's Law constant at 298.15K
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔvapH	Enthalpy of vaporization
  ρc	Critical density

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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