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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
Deltafgas-70.24 ± 0.98kcal/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
Deltafsolid-97.99 ± 0.41kcal/molCcrNabavian, Sabbah, et al., 1977Author was aware that data differs from previously reported values; ALS
Deltafsolid-98.8 ± 0.1kcal/molCcbLebedeva, Gutner, et al., 1971Hfusion=5.0±0.1, see Lebedeva, Rjadnenko, et al., 1969; ALS
Deltafsolid-78.47kcal/molCcbPushkareva and Kokoshko, 1946Author's hf298_condensed=-81.5 kcal/mol, used C as diamond; ALS
Quantity Value Units Method Reference Comment
Deltacsolid-799.47 ± 0.35kcal/molCcrNabavian, Sabbah, et al., 1977Author was aware that data differs from previously reported values; ALS
Deltacsolid-798.7 ± 0.1kcal/molCcbLebedeva, Gutner, et al., 1971Hfusion=5.0±0.1, see Lebedeva, Rjadnenko, et al., 1969; ALS
Deltacsolid-819.0kcal/molCcbPushkareva and Kokoshko, 1946Author's hf298_condensed=-81.5 kcal/mol, used C as diamond; ALS

Constant pressure heat capacity of solid

Cp,solid (cal/mol*K) Temperature (K) Reference Comment
44.79323.Satoh and Sogabe, 1941T = 0 to 100 C. Mean value.; DH
42.50298.Andrews, Lynn, et al., 1926T = 22 to 190 C.; DH

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
Deltar343.4 ± 2.1kcal/molG+TSKebarle and McMahon, 1977gas phase
Quantity Value Units Method Reference Comment
Deltar336.4 ± 2.0kcal/molIMREKebarle and McMahon, 1977gas phase

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, 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]

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]


Notes

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