4-Pyridinecarboxylic acid

• Formula: C₆H₅NO₂
• Molecular weight: 123.1094
• IUPAC Standard InChI: InChI=1S/C6H5NO2/c8-6(9)5-1-3-7-4-2-5/h1-4H,(H,8,9) Copy

  
• IUPAC Standard InChIKey: TWBYWOBDOCUKOW-UHFFFAOYSA-N Copy
• CAS Registry Number: 55-22-1
• Chemical structure:
  This structure is also available as a 2d Mol file
• Other names: Isonicotinic acid; γ-Picolinic acid; 4-Carboxypyridine; 4-Picolinic acid; Pyridinecarboxylic acid-(4); INA; Acide iso-nicotinique; α-Picolinic acid; Pyridine-4-carboxylic acid
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• Information on this page:
  • Phase change data
  • References
  • Notes
• Other data available:
  • Mass spectrum (electron ionization)
  • UV/Visible spectrum
  • Gas Chromatography
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  • Gas Phase Kinetics Database
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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 as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing

Enthalpy of sublimation

Enthalpy of fusion

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.

Leis and Curran, 1945
Leis, D.G.; Curran, B.C., Electric moments of some gamma-substituted pyridines, J. Am. Chem. Soc., 1945, 67, 79. [all data]

Sabbah and Ider, 1999
Sabbah, Raphaël; Ider, Safi, Energétique des liaisons inter- et intramoléculaires dans les trois acides carboxypyridiniques (acides picolinique, nicotinique et isonicotinique), Revue canadienne de chimie, 1999, 77, 2, 249-257, https://doi.org/10.1139/cjc-77-2-249 . [all data]

Ribeiro da Silva, 1998
Ribeiro da Silva, M., Enthalpies of combustion of the pyridine N-oxide derivatives: 4-methyl-, 3-cyano-, 4-cyano-, 3-hydroxy-, 2-carboxy-, 4-carboxy-, and 3-methyl-4-nitro, and of the pyridine derivatives: 2-carboxy-, and 4-carboxy-. The dissociation enthalpies of the N-O bonds, The Journal of Chemical Thermodynamics, 1998, 30, 7, 869-878, https://doi.org/10.1006/jcht.1998.0353 . [all data]

Allan, Geddes, et al., 1989
Allan, J.R.; Geddes, W.C.; Hindle, C.S.; Orr, A.E., Thermal analysis studies on pyridine carboxylic acid complexes of zinc(II), Thermochim. Acta, 1989, 153, 249-256. [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]

Notes

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• Symbols used in this document:
  

  Tfus	Fusion (melting) point
  ΔfusH	Enthalpy of fusion
  ΔsubH	Enthalpy of sublimation
  ΔsubH°	Enthalpy of sublimation at standard conditions

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