1,2-Propadiene-1,3-dione

• Formula: C₃O₂
• Molecular weight: 68.0309
• IUPAC Standard InChI: InChI=1S/C3O2/c4-2-1-3-5 Copy

  
• IUPAC Standard InChIKey: GNEVIACKFGQMHB-UHFFFAOYSA-N Copy
• CAS Registry Number: 504-64-3
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
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• Other names: Carbon suboxide; Carbon oxide (C3O2); C3O2
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• Information on this page:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Phase change data
  • Gas phase ion energetics data
  • References
  • Notes
• Other data available:
  • Mass spectrum (electron ionization)
  • Vibrational and/or electronic energy levels
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
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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 (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/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: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

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:
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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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 compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
LL - Sharon G. Lias and Joel F. Liebman
B - John E. Bartmess

Electron affinity determinations

Ionization energy determinations

Appearance energy determinations

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change 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.

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

Kybett, Johnson, et al., 1965
Kybett, B.D.; Johnson, G.K.; Barker, C.K.; Margrave, J.L., The heats of formation and polymerization of carbon suboxide, J. Phys. Chem., 1965, 69, 3603-3606. [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]

McDougall and Kilpatrick, 1965
McDougall, Lee A.; Kilpatrick, John E., Entropy and Related Thermodynamic Properties of Carbon Suboxide, J. Chem. Phys., 1965, 42, 7, 2311, https://doi.org/10.1063/1.1696294 . [all data]

McDougall and Kilpatrick, 1965, 2
McDougall, L.A.; Kilpatrick, J.E., Entropy and Related Thermodynamic Properties of Carbon Suboxide, J. Chem. Phys., 1965, 42, 7, 2311-2321, https://doi.org/10.1063/1.1696294 . [all data]

Oakes and Ellison, 1986
Oakes, J.M.; Ellison, G.B., Photoelectron spectroscopy of radical anions, Tetrahedron, 1986, 42, 6263. [all data]

Rabalais, Bergmark, et al., 1972
Rabalais, J.W.; Bergmark, T.; Werme, L.O.; Karlson, L.; Hussain, M.; Siebahn, K., The high-resolution electron spectrum of carbon suboxide in Electron Spectroscopy, ed. D.A. Shirley (North-Holland Pub. Co., Amsterdam), 1972, 425. [all data]

Baker and Turner, 1968
Baker, C.; Turner, D.W., The photoelectron spectrum and ionisation potentials of carbon suboxide, Chem. Commun., 1968, 400. [all data]

Kim and Roebber, 1966
Kim, H.H.; Roebber, J.L., Vacuum-ultraviolet absorption spectrum of carbon suboxide, J. Chem. Phys., 1966, 44, 1709. [all data]

Botter, 1963
Botter, R., Carbon sub-oxide, Advan. Mass Spectrom., 1963, 2, 540. [all data]

Chen and Holmes, 1994
Chen, H.; Holmes, J.L., The generation of OC₂O⁺ and OC₂O and a study of ionized OC₃O and C₂O by tandem mass spectrometry, Int. J. Mass Spectrom. Ion Processes, 1994, 133, 111. [all data]

Notes

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• Symbols used in this document:
  

  AE	Appearance energy
  EA	Electron affinity
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  ΔcH°liquid	Enthalpy of combustion of liquid at standard conditions
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfH°liquid	Enthalpy of formation of liquid at standard conditions
  ΔvapH	Enthalpy of vaporization

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