(Z)-1,2-Difluoroethylene

• Formula: C₂H₂F₂
• Molecular weight: 64.0341
• IUPAC Standard InChI: InChI=1S/C2H2F2/c3-1-2-4/h1-2H/b2-1- Copy

  
• IUPAC Standard InChIKey: WFLOTYSKFUPZQB-UPHRSURJSA-N Copy
• CAS Registry Number: 1630-77-9
• 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: Ethene, 1,2-difluoro-, (Z)-
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • References
  • Notes
• Other data available:
  • Vibrational and/or electronic energy levels
  • Gas Chromatography
• Data at other public NIST sites:
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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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

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Individual Reactions

C₂H₂F₂ =

By formula: C₂H₂F₂ = C₂H₂F₂

= C₂H₂F₂

By formula: C₂H₂F₂ = C₂H₂F₂

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

View reactions leading to C₂H₂F₂⁺ (ion structure unspecified)

Ionization energy determinations

Appearance energy determinations

References

Go To: Top, Reaction 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.

Craig, Piper, et al., 1971
Craig, N.C.; Piper, L.G.; Wheeler, V.L., Thermodynamics of cis-trans isomerizations. II. The 1-chloro-2-fluoroethylenes, 1,2-difluorocyclopropanes, and related molecules, J. Phys. Chem., 1971, 75, 1453-1460. [all data]

Craig and Entemann, 1961
Craig, N.C.; Entemann, E.A., Thermodynamics of cis-trans isomerizations. The 1,2-difluoroethylenes, J. Am. Chem. Soc., 1961, 83, 3047-3050. [all data]

Frenking, Koch, et al., 1984
Frenking, G.; Koch, W.; Schaale, M.; Baumgartel, H., The unimolecular decay of difluoroethene cations. An experimental and quantum-chemical study, Int. J. Mass Spectrom. Ion Phys., 1984, 61, 305. [all data]

Maier and Thommen, 1981
Maier, J.P.; Thommen, F., Photoelectron-photon coincidence measurements of the fluorescence quantum yields of cis-1,2-difluoroethylene cation in selected levels of the A2A1 State, J. Chem. Soc. Faraday Trans. 2, 1981, 77, 845. [all data]

Bieri, Niessen, et al., 1981
Bieri, G.; Niessen, W.V.; Asbrink, L.; Svensson, A., The He(II) photoelectron spectra of the fluorosubstituted ethylenes and their analysis by the green's function method, Chem. Phys., 1981, 60, 61. [all data]

Jochims, Lohr, et al., 1979
Jochims, H.-W.; Lohr, W.; Baumgartel, H., Photoreactions of small organic molecules. VI. Photoionization processes of difluoroethylenes, Nouv. J. Chim., 1979, 3, 109. [all data]

Sell, Mintz, et al., 1978
Sell, J.A.; Mintz, D.M.; Kupperman, A., Photoelectron angular distributions of carbon-carbon π electrons in ethylene, benzene, and their fluorinated derivatives, Chem. Phys. Lett., 1978, 58, 601. [all data]

Sell and Kuppermann, 1979
Sell, J.A.; Kuppermann, A., Variable angle photoelectron spectroscopy of the fluoroethylenes, J. Chem. Phys., 1979, 71, 4703. [all data]

Brundle, Robin, et al., 1972
Brundle, C.R.; Robin, M.B.; Kuebler, N.A.; Basch, H., Perfluoro effect in photoelectron spectroscopy. I. Nonaromatic molecules, J. Am. Chem. Soc., 1972, 94, 1451. [all data]

Stadelmann and Vogt, 1980
Stadelmann, J.P.; Vogt, J., A photoelectron-photoion coincidence study of cis- and trans- difluoroethene, Int. J. Mass Spectrom. Ion Phys., 1980, 35, 83. [all data]

Notes

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• Symbols used in this document:
  

  AE	Appearance energy
  IE (evaluated)	Recommended ionization energy
  ΔrH°	Enthalpy of reaction at standard conditions

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