Ethane, 1,1-difluoro-

• Formula: C₂H₄F₂
• Molecular weight: 66.0500
• IUPAC Standard InChI: InChI=1S/C2H4F2/c1-2(3)4/h2H,1H3 Copy

  
• IUPAC Standard InChIKey: NPNPZTNLOVBDOC-UHFFFAOYSA-N Copy
• CAS Registry Number: 75-37-6
• 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: Ethylidene fluoride; Algofrene Type 67; Freon 152a; FC 152a; Genetron 152a; R 152a; 1,1-Difluoroethane; CH3CHF2; Ethylidene difluoride; GENETRON 100; Propellant 152a; Halocarbon 152A; UN 1030; Dymel 152; Dymel 152A; HFC 152a
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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
  • References
  • Notes
• Other data available:
  • Reaction thermochemistry data
  • Ion clustering data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Gas Chromatography
  • Fluid Properties
• Data at other public NIST sites:
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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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

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 (atm)
    T = temperature (K)

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Enthalpy of fusion

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

Ionization energy determinations

Appearance energy determinations

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law 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.

Kolesov, Shtekher, et al., 1968
Kolesov, V.P.; Shtekher, S.N.; Martynov, A.M.; Skuratov, S.M., Standard enthalpy of formation of 1,1-difluoroethane, Russ. J. Phys. Chem. (Engl. Transl.), 1968, 42, 975-976. [all data]

Kolesov and Papina, 1983
Kolesov, V.P.; Papina, T.S., Thermochemistry of Haloethanes, Russ. Chem. Rev., 1983, 52, 425. [all data]

Nakagawa, Hori, et al., 1993
Nakagawa, S.; Hori, T.; Sato, H., and Watanabe K., Isobaric heat capacity for liquid 1-chloro-1,1-difluorethane and 1,1-difluoroethane, J. Chem. Eng. Data, 1993, 38(1), 70-74. [all data]

Porichanskii, Ponomareva, et al., 1982
Porichanskii, E.G.; Ponomareva, O.P.; Svetlichnyi, P.I., Study of the isobaric heat capacity of Freon 152A in a wide range of parametric conditions, Izv. Vyssh. Uchebn. Zaved., Energ., 1982, (3), 122-125. [all data]

PCR Inc., 1990
PCR Inc., Research Chemicals Catalog 1990-1991, PCR Inc., Gainesville, FL, 1990, 1. [all data]

Weast and Grasselli, 1989
CRC Handbook of Data on Organic Compounds, 2nd Editon, Weast,R.C and Grasselli, J.G., ed(s)., CRC Press, Inc., Boca Raton, FL, 1989, 1. [all data]

Henne and Renoll, 1936
Henne, A.L.; Renoll, M.W., J. Am. Chem. Soc., 1936, 58, 889. [all data]

Blanke and Weiss, 1992
Blanke, W.; Weiss, R., Isochoric (p,v,T) measurements on 1,1-difluoroethane (R152a) in the liquid state from the triple point to 450 K and at pressures up to 30 MPa, Fluid Phase Equilib., 1992, 80, 179-90. [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]

Fransson, Barreau, et al., 1992
Fransson, E.; Barreau, A.; Vidal, J., Vapor-liquid equilibrium in binary systems of n-pentane + chlorodifluoromethane or + 1,1-difluoroethane, J. Chem. Eng. Data, 1992, 37, 521-5. [all data]

Tamatsu, Sato, et al., 1992
Tamatsu, T.; Sato, T.; Sato, H.; Watanabe, K., An experimental study of the thermodynamic properties of 1,1-difluoroethane, Int. J. Thermophys., 1992, 13, 985-97. [all data]

Higashi, Ashizawa, et al., 1987
Higashi, Y.; Ashizawa, M.; Kabata, Y.; Majima, T.; Uematsu, M.; Watanabe, K., Measurements of vapor pressure, vapor-liquid coexistence curve and critical parameters of Refrigerant 152a, JSME Int. J., 1987, 30, 1106-12. [all data]

Mears, Stahl, et al., 1955
Mears, W.H.; Stahl, R.F.; Orfeo, S.R.; Shair, R.C.; Kells, L.F.; Thompson, W.; McCann, H., Thermodynamic Properties of Halogenated Ethanes and Ethylenes, Ind. Eng. Chem., 1955, 47, 1449. [all data]

Kul, DesMarteau, et al., 2001
Kul, Ismail; DesMarteau, Darryl D.; Beyerlein, Adolph L., Vapor--liquid equilibria for CF3OCF2H/fluorinated ethane and CF3SF5/fluorinated ethane mixtures as potential R22 alternatives, Fluid Phase Equilibria, 2001, 185, 1-2, 241-253, https://doi.org/10.1016/S0378-3812(01)00474-5 . [all data]

Lim, Park, et al., 1999
Lim, Jong Sung; Park, Ji-Young; Lee, Byung-Gwon; Lee, Youn-Woo; Kim, Jae-Duck, Phase Equilibria of CFC Alternative Refrigerant Mixtures: Binary Systems of Isobutane + 1,1,1,2-Tetrafluoroethane, + 1,1-Difluoroethane, and + Difluoromethane, J. Chem. Eng. Data, 1999, 44, 6, 1226-1230, https://doi.org/10.1021/je9900777 . [all data]

Silva and Weber, 1993
Silva, Alberto M.; Weber, Lloyd A., Ebulliometric measurement of the vapor pressure of 1-chloro-1,1-difluoroethane and 1,1-difluoroethane, J. Chem. Eng. Data, 1993, 38, 4, 644-646, https://doi.org/10.1021/je00012a043 . [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]

Mears, Stahl, et al., 1955, 2
Mears, Whitney H.; Stahl, Richard F.; Orfeo, S. Robert; Shair, Robert C.; Kells, Lyman F.; Thompson, Walter; McCann, Harold, Thermodynamic Properties of Halogenated Ethanes and Ethylenes, Ind. Eng. Chem., 1955, 47, 7, 1449-1454, https://doi.org/10.1021/ie50547a052 . [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]

Magee, 1998
Magee, J.W., International Journal of Thermophysics, 1998, 19, 5, 1397-1420, https://doi.org/10.1023/A:1021983502589 . [all data]

Heinis, Bar, et al., 1985
Heinis, T.; Bar, R.; Borlin, K.; Jungen, M., Photoionization mass spectrometry of 1,1-difluoroethane, Chem. Phys., 1985, 94, 235. [all data]

Heinis, Bar, et al., 1984
Heinis, T.; Bar, R.; Borlin, K.; Jungen, M., Photoionization of 1,1-difluoroethane: The structure of the C₂H₃F₂⁺ ions, Chem. Phys. Lett., 1984, 105, 327. [all data]

Lifshitz and Long, 1965
Lifshitz, C.; Long, F.A., Appearance potentials and mass spectra of fluorinated ethylenes. II. Heats offormation of fluorinated species and their positive ions, J. Phys. Chem., 1965, 69, 3731. [all data]

Sauvageau, Doucet, et al., 1974
Sauvageau, P.; Doucet, J.; Gilbert, R.; Sandorfy, C., Vacuum ultraviolet and photoelectron spectra of fluoroethanes, J. Chem. Phys., 1974, 61, 391. [all data]

Williamson, LeBreton, et al., 1976
Williamson, A.D.; LeBreton, P.R.; Beauchamp, J.L., Photoionization mass spectrometry of 2-fluoropropane and 2,2-difluoropropane. A novel determination of the proton affinity of vinyl fluoride and 1,1-difluoroethylene, J. Am. Chem. Soc., 1976, 98, 2705. [all data]

Simmie and Tschuikow-Roux, 1971
Simmie, J.M.; Tschuikow-Roux, E., Mass spectrum, appearance potentials and bond dissociation energies of 1,1,1-trifluoroethane, Int. J. Mass Spectrom. Ion Phys., 1971, 7, 41. [all data]

Notes

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• Symbols used in this document:
  

  AE	Appearance energy
  Cp,liquid	Constant pressure heat capacity of liquid
  IE (evaluated)	Recommended ionization energy
  Pc	Critical pressure
  Ptriple	Triple point pressure
  Tboil	Boiling point
  Tc	Critical temperature
  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
  ΔcH°gas	Enthalpy of combustion of gas at standard conditions
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfusH	Enthalpy of fusion
  ΔvapH	Enthalpy of vaporization
  ρc	Critical density

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