4-Aminobenzoic acid
- Formula: C7H7NO2
- Molecular weight: 137.1360
- IUPAC Standard InChI: InChI=1S/C7H7NO2/c8-6-3-1-5(2-4-6)7(9)10/h1-4H,8H2,(H,9,10)
- IUPAC Standard InChIKey: ALYNCZNDIQEVRV-UHFFFAOYSA-N
- CAS Registry Number: 150-13-0
- 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. - Other names: p-Aminobenzoic acid; Aminobenzoic Acid; Benzoic acid, 4-amino-; Benzoic acid, p-amino-; p-Carboxyaniline; p-Carboxyphenylamine; Amben; anti-Chromotrichia Factor; Anticanitic vitamin; Chromotrichia factor; Hachemina; Pabacyd; Pabafilm; Pabamine; Paraminol; Paranate; PAB; PABA; Trichochromogenic Factor; Vitamin BX; Vitamin H'; 4-Carboxyaniline; γ-Aminobenzoic acid; Aminobenzoic acid, para; Bacterial vitamin H1; Pabanol; Super Shade by Coppertone; 1-Amino-4-carboxybenzene; Kyselina p-aminobenzoova; Sunbrella; RVPaba Lipstick; para-Aminobenzoic acid; Romavit; Aniline-4-carboxylic acid; Anticantic vitamin; Pabagel; component of Presun; 8014-65-1; component of Presun (Salt/Mix)
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Condensed phase thermochemistry data
Go To: Top, References, Notes
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 |
|---|---|---|---|---|---|
| ΔfH°solid | -97.99 ± 0.41 | kcal/mol | Ccr | Nabavian, Sabbah, et al., 1977 | Author was aware that data differs from previously reported values; ALS |
| ΔfH°solid | -98.8 ± 0.1 | kcal/mol | Ccb | Lebedeva, Gutner, et al., 1971 | Hfusion=5.0±0.1, see Lebedeva, Rjadnenko, et al., 1969; ALS |
| ΔfH°solid | -78.47 | kcal/mol | Ccb | Pushkareva and Kokoshko, 1946 | Author's hf298_condensed=-81.5 kcal/mol, used C as diamond; ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°solid | -799.47 ± 0.35 | kcal/mol | Ccr | Nabavian, Sabbah, et al., 1977 | Author was aware that data differs from previously reported values; ALS |
| ΔcH°solid | -798.7 ± 0.1 | kcal/mol | Ccb | Lebedeva, Gutner, et al., 1971 | Hfusion=5.0±0.1, see Lebedeva, Rjadnenko, et al., 1969; ALS |
| ΔcH°solid | -819.0 | kcal/mol | Ccb | Pushkareva and Kokoshko, 1946 | Author'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 |
|---|---|---|---|
| 44.79 | 323. | Satoh and Sogabe, 1941 | T = 0 to 100 C. Mean value.; DH |
| 42.50 | 298. | Andrews, Lynn, et al., 1926 | T = 22 to 190 C.; DH |
References
Go To: Top, Condensed phase 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]
Notes
Go To: Top, Condensed phase thermochemistry data, 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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