3-Cyclobutene-1,2-dione, 3,4-dihydroxy-

• Formula: C₄H₂O₄
• Molecular weight: 114.0563
• IUPAC Standard InChI: InChI=1S/C4H2O4/c5-1-2(6)4(8)3(1)7/h5-6H Copy

  
• IUPAC Standard InChIKey: PWEBUXCTKOWPCW-UHFFFAOYSA-N Copy
• CAS Registry Number: 2892-51-5
• 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: Squaric acid; Cyclobutenedione, dihydroxy-; Quadratic acid; 1,2-Dihydroxycyclobutene-3,4-dione; 1,2-Diketo-3,4-dihydroxycyclobutene; 3,4-Dihydroxy-3-cyclobutene-1,2-dione; 1,2-Dihydroxy cyclobutenedione; 1,2-Dihydroxy-3,4-cyclobutenedione; Cyclobutene-1,2-dione, 3,4-dihydroxy-; 3,4-Dihydroxy-cyclobutene-1,2-dione; NSC 125692
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• Information on this page:
  • Condensed phase thermochemistry data
  • Mass spectrum (electron ionization)
  • References
  • Notes
• Other data available:
  • Gas phase thermochemistry data
  • Phase change data
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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 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 solid

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

References

Go To: Top, Condensed phase thermochemistry data, Mass spectrum (electron ionization), Notes

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

Sellers, 1971
Sellers, P., Enthalpies of formation of squaric acid and the corresponding diethyl ether, Acta Chem. Scand., 1971, 25, 2194-2198. [all data]

DeWit, Offringa, et al., 1983
DeWit, H.G.M.; Offringa, J.C.A.; De Kruif, C.G.; Van Miltenburg, J.C., Thermodynamic properties of molecular organic crystals containing nitrogen, oxygen and sulfur. III. Molar heat capacities measured by differential scanning calorimetry, Thermochim. Acta, 1983, 65, 43-51. [all data]

Barth, Helwig, et al., 1979
Barth, E.; Helwig, J.; Maier, H.D.; Mser, H.E.; Petersson, J., Specific heat of the two dimensional antiferroelectric squaric acid, Z. Phys., 1979, B34, 393-397. [all data]

Notes

Go To: Top, Condensed phase thermochemistry data, Mass spectrum (electron ionization), References

• Symbols used in this document:
  

  Cp,solid	Constant pressure heat capacity of solid
  ΔcH°solid	Enthalpy of combustion of solid at standard conditions
  ΔfH°solid	Enthalpy of formation of solid at standard conditions

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