2(1H)-Pyridinone

• Formula: C₅H₅NO
• Molecular weight: 95.0993
• IUPAC Standard InChI: InChI=1S/C5H5NO/c7-5-3-1-2-4-6-5/h1-4H,(H,6,7) Copy

  
• IUPAC Standard InChIKey: UBQKCCHYAOITMY-UHFFFAOYSA-N Copy
• CAS Registry Number: 142-08-5
• 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.
• Species with the same structure:
  • pyridin-2-ol
• Other names: α-Pyridone; 2-Hydroxypyridine; 2(1H)-Pyridone; 2-Oxopyridine; 2-Pyridinol; 2-Pyridinone; 2-Pyridone; 2-Pyridol; Pyridone-2; 1-Hydroxy-2-pyridine; 1H-Pyridin-2-one
• Information on this page:
  • Phase change data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • Mass spectrum (electron ionization)
  • UV/Visible spectrum
  • Gas Chromatography
  • References
  • Notes
• Other data available:
  • IR Spectrum
• Options:
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• NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

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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 by: William E. Acree, Jr., James S. Chickos

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

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

=

By formula: C₅H₅NO = C₅H₅NO

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:
LL - Sharon G. Lias and Joel F. Liebman
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi

Ionization energy determinations

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

UV/Visible spectrum

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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: Victor Talrose, Alexander N. Yermakov, Alexy A. Usov, Antonina A. Goncharova, Axlexander N. Leskin, Natalia A. Messineva, Natalia V. Trusova, Margarita V. Efimkina

Spectrum

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Additional Data

Gas Chromatography

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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

Normal alkane RI, non-polar column, temperature ramp

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Normal alkane RI, non-polar column, custom temperature program

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References

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

Suradi, El Saiad, et al., 1982
Suradi, S.; El Saiad, N.; Pilcher, G.; Skinner, H.A., Enthalpies of combustion of the three hydroxy-pyridines and the four hydroxy-2-methylpyridines, J. Chem. Thermodyn., 1982, 14, 45-50. [all data]

Pedley, Naylor, et al., 1986
Pedley, J.B.; Naylor, R.D.; Kirby, S.P., Thermochemical Data of Organic Compounds, 1986, https://doi.org/10.1007/978-94-009-4099-4 . [all data]

Cook, Katritzky, et al., 1976
Cook, M.J.; Katritzky, A.R.; Hepler, L.G.; Matsui, T., Heats of solution and tautomeric equilibrium constants. The 2-pyridone: 2-hydroxypyridine equilibrium in non-aqueous media, Tetrahedron Lett., 1976, 2685-2688. [all data]

Ozeki, Cockett, et al., 1995
Ozeki, H.; Cockett, M.C.R.; Okuyama, K.; Takahashi, M.; Kumura, K., Structural isomers and tautomerism of 2-hydroxypyridine in the cation ground state studied by zero kinetic energy (ZEKE) photoelectron spectroscopy, J. Phys. Chem., 1995, 99, 8608. [all data]

Stefanovic and Grutzmacher, 1974
Stefanovic, D.; Grutzmacher, H.F., The ionisation potential of some substituted pyridines, Org. Mass Spectrom., 1974, 9, 1052. [all data]

Cook, El-Abbady, et al., 1977
Cook, M.J.; El-Abbady, S.; Katritzky, A.R.; Guimon, C.; Pfister-Guillouzo, G., Photoelectron spectra of hydroxy- and mercapto-pyridines and models of fixed structure, J. Chem. Soc. Perkin Trans. 2, 1977, 1652. [all data]

Burton, et al., 1972
Burton, A.G., et al., J. Chem. Soc., Perkin Trans. II, 1972, 1953. [all data]

Vazques, Aimar, et al., 2011
Vazques, A.M.; Aimar, M.L.; Demmel, G.I.; Criado, S.G.; Ruiz, G.M.; Cantero, J.J.; Rossi, L.I.; Velasco, M.I., Determination of volatile organic compounds of Tagetes argentina Cabrera (asteraceae) using HS-SPME analysis, Boletin Latinoamericano y del Caribe Plantas Medicinales y Aromaticas, 2011, 10, 5, 463-469. [all data]

Vazquez, Demmel, et al., 2011
Vazquez, A.M.; Demmel, G.I.; Criado, S.G.; Aimar, M.L.; Cantero, J.; Rossi, L.I.; Velasco, M.I., Phytochemistry of TAgetes minuta L. (Asteraceae) from Cordoba, Argentina: comparative study between essential oil and HS-SPME analyses, Boletin Latinoamericano y del Caribe Plantas Medicinales y Aromaticas, 2011, 10, 4, 351-362. [all data]

Chen and Ho, 1999
Chen, J.; Ho, C.-T., Comparison of volatile generation in serine/threonine/glutamine-ribose/glucose/fructose model systems, J. Agric. Food Chem., 1999, 47, 2, 643-647, https://doi.org/10.1021/jf980771a . [all data]

Notes

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• Symbols used in this document:
  

  IE (evaluated)	Recommended ionization energy
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔsubH°	Enthalpy of sublimation at standard conditions

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