Tetrafluoromethane

• Formula: CF₄
• Molecular weight: 88.0043
• IUPAC Standard InChI: InChI=1S/CF4/c2-1(3,4)5 Copy

  
• IUPAC Standard InChIKey: TXEYQDLBPFQVAA-UHFFFAOYSA-N Copy
• CAS Registry Number: 75-73-0
• 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: Carbon tetrafluoride; Methane, tetrafluoro-; Arcton 0; Carbon fluoride (CF4); Freon 14; FC 14; Perfluoromethane; CF4; Halon 14; Carbon fluoride; F 14; Halocarbon 14; R 14; UN 1982; Refrigerant 14; CFC 14; R 14 (Refrigerant); Refrigerant R 14; Methane, tetrafluo-
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data
  • Henry's Law data
  • Gas phase ion energetics data
  • Ion clustering data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Vibrational and/or electronic energy levels
  • References
  • Notes
• Other data available:
  • Gas Chromatography
  • Fluid Properties
• Data at other public NIST sites:
  • Electron-Impact Ionization Cross Sections (on physics web site)
  • Gas Phase Kinetics Database
  • X-ray Photoelectron Spectroscopy Database, version 5.0
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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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View table.

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 as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - 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
DH - Eugene S. Domalski and Elizabeth D. Hearing
AC - William E. Acree, Jr., James S. Chickos
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis

Enthalpy of vaporization

Entropy of vaporization

Antoine Equation Parameters

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

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Enthalpy of sublimation

Enthalpy of fusion

Entropy of fusion

Enthalpy of phase transition

Entropy of phase transition

Reaction 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:
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
MS - José A. Martinho Simões

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

( • 4) +  = ( • 5)

By formula: (F^- • 4CF₄) + CF₄ = (F^- • 5CF₄)

(CF₃^- • 3) +  = (CF₃^- • 4)

By formula: (CF₃^- • 3CF₄) + CF₄ = (CF₃^- • 4CF₄)

 + 2 =  + 4

By formula: CF₄ + 2H₂O = CO₂ + 4HF

( • 2) +  = ( • 3)

By formula: (CF₃⁺ • 2CF₄) + CF₄ = (CF₃⁺ • 3CF₄)

( • 3) +  = ( • 4)

By formula: (CF₃⁺ • 3CF₄) + CF₄ = (CF₃⁺ • 4CF₄)

( • ) +  = ( • 2)

By formula: (CF₃⁺ • CF₄) + CF₄ = (CF₃⁺ • 2CF₄)

(CHF₄⁺ • 2) +  = (CHF₄⁺ • 3)

By formula: (CHF₄⁺ • 2CF₄) + CF₄ = (CHF₄⁺ • 3CF₄)

(CHF₄⁺ • ) +  = (CHF₄⁺ • 2)

By formula: (CHF₄⁺ • CF₄) + CF₄ = (CHF₄⁺ • 2CF₄)

( • 2) +  = ( • 3)

By formula: (F^- • 2CF₄) + CF₄ = (F^- • 3CF₄)

( • 3) +  = ( • 4)

By formula: (F^- • 3CF₄) + CF₄ = (F^- • 4CF₄)

(CF₃^- • 2) +  = (CF₃^- • 3)

By formula: (CF₃^- • 2CF₄) + CF₄ = (CF₃^- • 3CF₄)

( • ) +  = ( • 2)

By formula: (F^- • CF₄) + CF₄ = (F^- • 2CF₄)

(CF₃^- • ) +  = (CF₃^- • 2)

By formula: (CF₃^- • CF₄) + CF₄ = (CF₃^- • 2CF₄)

C₄H₉⁺ +  = (C₄H₉⁺ • )

By formula: C₄H₉⁺ + CF₄ = (C₄H₉⁺ • CF₄)

 +  = ( • )

By formula: CF₃⁺ + CF₄ = (CF₃⁺ • CF₄)

CHF₄⁺ +  = (CHF₄⁺ • )

By formula: CHF₄⁺ + CF₄ = (CHF₄⁺ • CF₄)

 +  = ( • )

By formula: F^- + CF₄ = (F^- • CF₄)

CF₃^- +  = (CF₃^- • )

By formula: CF₃^- + CF₄ = (CF₃^- • CF₄)

2 =  + 

By formula: 2CF₂O = CO₂ + CF₄

2 = 4 + 5 + 3

By formula: 2C₂F₁₁N₅ = 4CF₄ + 5N₂ + 3F₂

CF₅N =  + 0.5 + 0.5

By formula: CF₅N = CF₄ + 0.5N₂ + 0.5F₂

 + 0.5 + 0.5 = CF₅N

By formula: CF₄ + 0.5N₂ + 0.5F₂ = CF₅N

2 = 2 + 3 + 3

By formula: 2CF₇N₃ = 2CF₄ + 3N₂ + 3F₂

2 = 2 + 3 + 

By formula: 2CF₅N₃ = 2CF₄ + 3N₂ + F₂

=  + 2 + 2

By formula: CF₈N₄ = CF₄ + 2N₂ + 2F₂

=  +  + 

By formula: CF₆N₂ = CF₄ + N₂ + F₂

C₅O₅W (g) +  (g) = C₆F₄O₅W (g)

By formula: C₅O₅W (g) + CF₄ (g) = C₆F₄O₅W (g)

3 + 5 = 6 + 4

By formula: 3C₂F₃N + 5F₃N = 6CF₄ + 4N₂

4 +  =  + 4

By formula: 4Na + CF₄ = C + 4FNa

 + 4 =  + 4

By formula: CF₄ + 4HF = CH₄ + 4F₂

3 + 2 = 6 + 

By formula: 3C₂F₆ + 2F₃N = 6CF₄ + N₂

(CHF₄⁺ • 3) +  = (CHF₄⁺ • 4)

By formula: (CHF₄⁺ • 3CF₄) + CF₄ = (CHF₄⁺ • 4CF₄)

 + 2 = 2

By formula: C₂F₄ + 2F₂ = 2CF₄

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:
HL - Edward P. Hunter and Sharon G. Lias
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
LL - Sharon G. Lias and Joel F. Liebman
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

Ionization energy determinations

Appearance energy determinations

Ion clustering 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: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

 +  = ( • )

By formula: CF₃⁺ + CF₄ = (CF₃⁺ • CF₄)

( • ) +  = ( • 2)

By formula: (CF₃⁺ • CF₄) + CF₄ = (CF₃⁺ • 2CF₄)

( • 2) +  = ( • 3)

By formula: (CF₃⁺ • 2CF₄) + CF₄ = (CF₃⁺ • 3CF₄)

( • 3) +  = ( • 4)

By formula: (CF₃⁺ • 3CF₄) + CF₄ = (CF₃⁺ • 4CF₄)

CF₃^- +  = (CF₃^- • )

By formula: CF₃^- + CF₄ = (CF₃^- • CF₄)

(CF₃^- • ) +  = (CF₃^- • 2)

By formula: (CF₃^- • CF₄) + CF₄ = (CF₃^- • 2CF₄)

(CF₃^- • 2) +  = (CF₃^- • 3)

By formula: (CF₃^- • 2CF₄) + CF₄ = (CF₃^- • 3CF₄)

(CF₃^- • 3) +  = (CF₃^- • 4)

By formula: (CF₃^- • 3CF₄) + CF₄ = (CF₃^- • 4CF₄)

CHF₄⁺ +  = (CHF₄⁺ • )

By formula: CHF₄⁺ + CF₄ = (CHF₄⁺ • CF₄)

(CHF₄⁺ • ) +  = (CHF₄⁺ • 2)

By formula: (CHF₄⁺ • CF₄) + CF₄ = (CHF₄⁺ • 2CF₄)

(CHF₄⁺ • 2) +  = (CHF₄⁺ • 3)

By formula: (CHF₄⁺ • 2CF₄) + CF₄ = (CHF₄⁺ • 3CF₄)

(CHF₄⁺ • 3) +  = (CHF₄⁺ • 4)

By formula: (CHF₄⁺ • 3CF₄) + CF₄ = (CHF₄⁺ • 4CF₄)

C₄H₉⁺ +  = (C₄H₉⁺ • )

By formula: C₄H₉⁺ + CF₄ = (C₄H₉⁺ • CF₄)

 +  = ( • )

By formula: F^- + CF₄ = (F^- • CF₄)

( • ) +  = ( • 2)

By formula: (F^- • CF₄) + CF₄ = (F^- • 2CF₄)

( • 2) +  = ( • 3)

By formula: (F^- • 2CF₄) + CF₄ = (F^- • 3CF₄)

( • 3) +  = ( • 4)

By formula: (F^- • 3CF₄) + CF₄ = (F^- • 4CF₄)

( • 4) +  = ( • 5)

By formula: (F^- • 4CF₄) + CF₄ = (F^- • 5CF₄)

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:   T_d     Symmetry Number σ = 12

Source: Shimanouchi, 1972

Notes

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, 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]

Price and Sapiano, 1979
Price, S.J.W.; Sapiano, H.J., Determination of ΔH°_f298(C₆F₁₀,g) and ΔH°_f298(C₆F₁₂,g) from studies of the combustion of decafluorocyclohexene and dodecafluorocylohexene in oxygen and calculation of the resonance energy of hexafluorobenzene, Can. J. Chem., 1979, 58, 685-688. [all data]

Krech, Price, et al., 1973
Krech, M.J.; Price, S.J.W.; Yared, W.F., Determination of the heat of formation of octafluorotoluene and calculation of D[C₆F₅-F] - D[C₆F₅-CF₃], Can. J. Chem., 1973, 51, 3662-3664. [all data]

Smith and Pace, 1969
Smith, J.H.; Pace, E.L., The thermodynamic properties of carbon tetrafluoride from 12°K to its boiling point. The significance of the parameter {nu}, J. Phys. Chem., 1969, 73, 4232-4236. [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]

Thorp and Scott, 1956
Thorp, N.; Scott, R.L., Fluorocarbon solutions at low termperatures. I. The liquid mixtures CF4-CHF3, CF4-CH4, CF4-Kr, CH4-Kr., J. Phys. Chem., 1956, 60, 670. [all data]

Ruff and Keim, 1930
Ruff, O.; Keim, R., The reaction products of carbon with fluorine: I. Tetrafluoromethane., Z. Anorg. Allg. Chem., 1930, 192, 249. [all data]

Altunin, Geller, et al., 1987
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]

Chari, 1960
Chari, N.C., Thermodynamic Properties of Carbon Tetrafluoride., Ph.D. Dissertation, Univ. Mich., Ann Arbour, MI, 1960. [all data]

Terry, Lynch, et al., 1969
Terry, M.J.; Lynch, J.T.; Bunclark, M.; Mansell, K.R.; Staveley, L.A.K., The Densities of Liquid Argon, Krypton, Xenon, Oxygen, Nitrogen, Carbon Monoxide, Methane and Carbon Tetrafluoride Along the Orthobaric Liquid Curve, J. Chem. Thermodyn., 1969, 1, 413. [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]

Menzel and Mohry, 1933
Menzel, Walter; Mohry, Friedrich, Die Dampfdrucke des CF4 und NF3 und der Tripelpunkt des CF4, Z. Anorg. Allg. Chem., 1933, 210, 3, 257-263, https://doi.org/10.1002/zaac.19332100305 . [all data]

Regnier, 1972
Regnier, J., Tension de Vapeur de L'Ethane Entre 80 et 135 K, J. Chim. Phys., 1972, 69, 942-944. [all data]

Simon, Knobler, et al., 1967
Simon, M.; Knobler, C.M.; Duncan, A.G., The vapour pressure of tetrafluoromethane from 86 to 146° K, Cryogenics, 1967, 7, 1-4, 138-140, https://doi.org/10.1016/S0011-2275(67)80053-5 . [all data]

Bondi, 1963
Bondi, A., Heat of Siblimation of Molecular Crystals: A Catalog of Molecular Structure Increments., J. Chem. Eng. Data, 1963, 8, 3, 371-381, https://doi.org/10.1021/je60018a027 . [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [all data]

Enokida, Shinoda, et al., 1969
Enokida, H.; Shinoda, T.; Mashiko, Y., Thermodynamic properties of carbon tetrafluoride from 40°K to its melting point, Bull. Chem. Soc. Japan, 1969, 42, 3415-3421. [all data]

Kostryukov, Samorukov, et al., 1958
Kostryukov, V.N.; Samorukov, O.P.; Strelkov, P.G., Thermodynamic studies at low temperatures VII. Phase transitions in solid BF₃, CF₄ and SiF₄, Zhur. Fiz. Khim., 1958, 32, 1354-1361. [all data]

Hiraoka, Nasu, et al., 1995
Hiraoka, K.; Nasu, M.; Fujimaki, S.; Ignacio, E.W.; Yamabe, S., Weak Ion-Molecule Complexes of F-(CF4)n and CF3-(CF4)n, Chem Phys. Let., 1995, 245, 1, 14, https://doi.org/10.1016/0009-2614(95)00980-I . [all data]

Good, Scott, et al., 1956
Good, W.D.; Scott, D.W.; Waddington, G., Combustion calorimetry of organic fluorine compounds by a rotating-bomb method, J. Phys. Chem., 1956, 60, 1080-1089. [all data]

Scott, Good, et al., 1955
Scott, D.W.; Good, W.D.; Waddington, G., Heat of formation of tetrafluoromethane from combustion calorimetry of polytetrafluoroethylene, J. Am. Chem. Soc., 1955, 77, 245-246. [all data]

Hiraoka, Nasu, et al., 1996
Hiraoka, K.; Nasu, M.; Fujimaki, S.; Ignacio, E.W.; Yamabe, S., Gas-Phase Stability and Structure of the Cluster Ions CF3+(CO)n, CF3+(N2)n, CF3+((CF4)n, and CF4H+(CF4)n, J. Phys. Chem., 1996, 100, 13, 5245, https://doi.org/10.1021/jp9530010 . [all data]

Sharma, Meza de Hojer, et al., 1985
Sharma, D.M.S.; Meza de Hojer, S.; Kebarle, P., Stabilities of halonium ions from a study of gas-phase equilibria R+ + XR' = (RXR')+, J. Am. Chem. Soc., 1985, 107, 13, 3757, https://doi.org/10.1021/ja00299a002 . [all data]

Amphlett, Dacey, et al., 1971
Amphlett, J.C.; Dacey, J.R.; Pritchard, G.O., An investigation of the reaction 2COF₂ = CO₂ + CF₄ and the heat of formation of carbonyl fluoride, J. Phys. Chem., 1971, 75, 3024-3026. [all data]

Sinke, Thompson, et al., 1967
Sinke, G.C.; Thompson, C.J.; Jostad, R.E.; Walker, L.C.; Swanson, A.C.; Stull, D.R., Enthalpies of formation and bond energies of some fluoramines, J. Chem. Phys., 1967, 47, 1852-1854. [all data]

Walker, 1972
Walker, L.C., The enthalpy of decomposition of CF₃NF₂(g) to CF₄(g), N₂(g), and F₂(g), J. Chem. Thermodyn., 1972, 4, 219-223. [all data]

Brown, Ishikawa, et al., 1990
Brown, C.E.; Ishikawa, Y.; Hackett, P.A.; Rayner, D.M., J. Am. Chem. Soc., 1990, 112, 2530. [all data]

Walker, Sinke, et al., 1970
Walker, L.C.; Sinke, G.C.; Perettie, D.J.; Janz, G.J., Enthalpy of formation of trifluoroacetonitrile, J. Am. Chem. Soc., 1970, 92, 4525-4526. [all data]

Vorob'ev and Skuratov, 1960
Vorob'ev, A.F.; Skuratov, S.M., Standard enthalpies of formation of CF₄, Zh. Neorg. Khim., 1960, 5, 1398-1401. [all data]

Jessup, McCoskey, et al., 1955
Jessup, R.S.; McCoskey, R.E.; Nelson, R.A., The heat of formation of tetrafluoromethane, J. Am. Chem. Soc., 1955, 77, 244-245. [all data]

Sinke, 1966
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Domalski and Armstrong, 1967
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Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

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Carlson, Fahlman, et al., 1984
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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
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  S°liquid	Entropy of liquid at standard conditions
  Tboil	Boiling point
  Tc	Critical temperature
  Tfus	Fusion (melting) point
  Ttriple	Triple point temperature
  Vc	Critical volume
  d(ln(kH))/d(1/T)	Temperature dependence parameter for Henry's Law constant
  k°H	Henry's Law constant at 298.15K
  ΔHtrs	Enthalpy of phase transition
  ΔStrs	Entropy of phase transition
  ΔcH°liquid	Enthalpy of combustion of liquid at standard conditions
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfusH	Enthalpy of fusion
  ΔfusS	Entropy of fusion
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔrS°	Entropy of reaction at standard conditions
  ΔsubH	Enthalpy of sublimation
  ΔvapH	Enthalpy of vaporization
  ΔvapS	Entropy of vaporization
  ρc	Critical density

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