4-Aminobenzoic acid

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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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity Value Units Method Reference Comment
Δfgas-293.9 ± 4.1kJ/molCcrNabavian, Sabbah, et al., 1977Author was aware that data differs from previously reported values

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

Quantity Value Units Method Reference Comment
Δfsolid-410.0 ± 1.7kJ/molCcrNabavian, Sabbah, et al., 1977Author was aware that data differs from previously reported values; ALS
Δfsolid-413. ± 0.4kJ/molCcbLebedeva, Gutner, et al., 1971Hfusion=5.0±0.1, see Lebedeva, Rjadnenko, et al., 1969; ALS
Δfsolid-328.3kJ/molCcbPushkareva and Kokoshko, 1946Author's hf298_condensed=-81.5 kcal/mol, used C as diamond; ALS
Quantity Value Units Method Reference Comment
Δcsolid-3345.0 ± 1.5kJ/molCcrNabavian, Sabbah, et al., 1977Author was aware that data differs from previously reported values; ALS
Δcsolid-3342. ± 0.4kJ/molCcbLebedeva, Gutner, et al., 1971Hfusion=5.0±0.1, see Lebedeva, Rjadnenko, et al., 1969; ALS
Δcsolid-3427.kJ/molCcbPushkareva and Kokoshko, 1946Author's hf298_condensed=-81.5 kcal/mol, used C as diamond; ALS

Constant pressure heat capacity of solid

Cp,solid (J/mol*K) Temperature (K) Reference Comment
187.4323.Satoh and Sogabe, 1941T = 0 to 100 C. Mean value.; DH
177.8298.Andrews, Lynn, et al., 1926T = 22 to 190 C.; DH

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
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Tfus461.4KN/AAndrews, Lynn, et al., 1926, 2Uncertainty assigned by TRC = 0.6 K; with some decomposition; TRC
Quantity Value Units Method Reference Comment
Δsub116.1 ± 3.7kJ/molVNabavian, Sabbah, et al., 1977Author was aware that data differs from previously reported values; ALS
Δsub116.1 ± 3.7kJ/molVSabbah, Chastelet, et al., 1974ALS
Δsub116. ± 3.7kJ/molCSabbah, Chastel, et al., 1974See also Nabavian, Sabbah, et al., 1977, 2.; AC

Enthalpy of sublimation

ΔsubH (kJ/mol) Temperature (K) Method Reference Comment
112. ± 1.373.TEde Kruif, Voogd, et al., 1979AC
114. ± 3.5367. to 389.CSabbah, Chastel, et al., 1974AC

Enthalpy of fusion

ΔfusH (kJ/mol) Temperature (K) Method Reference Comment
22.62458.7DSCGracin and Rasmuson, 2004AC
24.5459.2N/ARotich, Glass, et al., 2001AC
20.92461.4N/AAcree, 1991AC
20.920461.4N/AAndrews, Lynn, et al., 1926DH

Entropy of fusion

ΔfusS (J/mol*K) Temperature (K) Reference Comment
45.3461.4Andrews, Lynn, et al., 1926DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


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: John E. Bartmess

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

C7H6NO2- + Hydrogen cation = 4-Aminobenzoic acid

By formula: C7H6NO2- + H+ = C7H7NO2

Quantity Value Units Method Reference Comment
Δr1437. ± 8.8kJ/molG+TSKebarle and McMahon, 1977gas phase
Quantity Value Units Method Reference Comment
Δr1407. ± 8.4kJ/molIMREKebarle and McMahon, 1977gas phase

IR Spectrum

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Data compiled by: Coblentz Society, Inc.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director


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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Mass spectrum
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Additional Data

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Owner NIST Mass Spectrometry Data Center
Collection (C) 2014 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
Origin NIST Mass Spectrometry Data Center, 1990.
NIST MS number 118372

All mass spectra in this site (plus many more) are available from the NIST/EPA/NIH Mass Spectral Library. Please see the following for information about the library and its accompanying search program.


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, Eugeny B. Stern, Antonina A. Goncharova, Natalia A. Messineva, Natalia V. Trusova, Margarita V. Efimkina

Spectrum

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UVVis spectrum
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Additional Data

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Source Grammaticakis, 1951
Owner INEP CP RAS, NIST OSRD
Collection (C) 2007 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
Origin INSTITUTE OF ENERGY PROBLEMS OF CHEMICAL PHYSICS, RAS
Source reference RAS UV No. 409
Instrument n.i.g.
Melting point 188.5

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), UV/Visible spectrum, Notes

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

Nabavian, Sabbah, et al., 1977
Nabavian, P.M.; Sabbah, R.; Chastel, R.; Laffitte, M., Thermodynamique de composes azotes. II. Etude thermochimique des acides aminobenzoiques, de la pyrimidine, de l'uracile et de la thymine., J. Chim. Phys., 1977, 74, 115-126. [all data]

Lebedeva, Gutner, et al., 1971
Lebedeva, N.D.; Gutner, N.M.; Ryadnenko, V.L., Heats of combustion and formation of certain aromatic amino-derivatives, Russ. J. Phys. Chem. (Engl. Transl.), 1971, 45, 561-562. [all data]

Lebedeva, Rjadnenko, et al., 1969
Lebedeva, N.D.; Rjadnenko, B.L.; Gutner, N.M., Heats of formation of some N-containing organic compounds, Int. Conf. Calorim. Therm. (Warsaw, Poland), 1969, 1-8. [all data]

Pushkareva and Kokoshko, 1946
Pushkareva, Z.V.; Kokoshko, Z.U., On the question of the relation between the structure and bacteriostatic activity of sulphanilamide compounds. I. The resonance energy of some sulphanilamide compounds, Zh. Obshch. Kim., 1946, 16, 1269-1278. [all data]

Satoh and Sogabe, 1941
Satoh, S.; Sogabe, T., The heat capacities of some organic compounds containing nitrogen and the atomic heat of nitrogen. (2), Sci., Pap. Inst. Phys. Chem. Res. (Tokyo), 1941, 38, 231-237. [all data]

Andrews, Lynn, et al., 1926
Andrews, D.H.; Lynn, G.; Johnston, J., The heat capacities and heat of crystallization of some isomeric aromatic compounds, J. Am. Chem. Soc., 1926, 48, 1274-1287. [all data]

Andrews, Lynn, et al., 1926, 2
Andrews, D.H.; Lynn, G.; Johnston, J., The Heat Capacities and Heat of Crystallization of Some Isomeric Aromatic Compounds, J. Am. Chem. Soc., 1926, 48, 1274. [all data]

Sabbah, Chastelet, et al., 1974
Sabbah, R.; Chastelet, R.; Laffitte, M., Thermodynamic de composès azotes. I. Etude calorimètrique des enthalpies de sublimation des trios acides aminobenzoïques, Can. J. Chem., 1974, 52, 2201. [all data]

Sabbah, Chastel, et al., 1974
Sabbah, Raphaël; Chastel, Raymond; Laffitte, Marc, Thermodynamique de composés azotés. I. Etude calorimétrique des enthalpies de sublimation des trois acides aminobenzoïques, Can. J. Chem., 1974, 52, 12, 2201-2205, https://doi.org/10.1139/v74-319 . [all data]

Nabavian, Sabbah, et al., 1977, 2
Nabavian, M.; Sabbah, R.; Chastel, R.; Laffitte, M., J. Chim. Phys.Phys.-Chim. Biol., 1977, 74, 115. [all data]

de Kruif, Voogd, et al., 1979
de Kruif, C.G.; Voogd, J.; Offringa, J.C.A., Enthalpies of sublimation and vapour pressures of 14 amino acids and peptides, The Journal of Chemical Thermodynamics, 1979, 11, 7, 651-656, https://doi.org/10.1016/0021-9614(79)90030-2 . [all data]

Gracin and Rasmuson, 2004
Gracin, Sandra; Rasmuson, Åke C., Polymorphism and Crystallization of p -Aminobenzoic Acid, Crystal Growth & Design, 2004, 4, 5, 1013-1023, https://doi.org/10.1021/cg049954h . [all data]

Rotich, Glass, et al., 2001
Rotich, M.K.; Glass, B.D.; Brown, M.E., Journal of Thermal Analysis and Calorimetry, 2001, 64, 2, 681-688, https://doi.org/10.1023/A:1011584125859 . [all data]

Acree, 1991
Acree, William E., Thermodynamic properties of organic compounds: enthalpy of fusion and melting point temperature compilation, Thermochimica Acta, 1991, 189, 1, 37-56, https://doi.org/10.1016/0040-6031(91)87098-H . [all data]

Kebarle and McMahon, 1977
Kebarle, P.; McMahon, T.B., Intrinsic Acidities of Substituted Phenols and Benzoic Acids Determined by Gas Phase Proton Transfer Equilibria, J. Am. Chem. Soc., 1977, 99, 7, 2222, https://doi.org/10.1021/ja00449a032 . [all data]

Grammaticakis, 1951
Grammaticakis, P., Contribution a l'etude de l'absorption dans l'ultraviolet moyen et le visible des arylamines isomeres et de leurs derives N substitues (Premier memoire), Bull. Soc. Chim. Fr., 1951, 18, 220-226. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), UV/Visible spectrum, References