Isophthalic acid
- Formula: C8H6O4
- Molecular weight: 166.1308
- IUPAC Standard InChI: InChI=1S/C8H6O4/c9-7(10)5-2-1-3-6(4-5)8(11)12/h1-4H,(H,9,10)(H,11,12)
- IUPAC Standard InChIKey: QQVIHTHCMHWDBS-UHFFFAOYSA-N
- CAS Registry Number: 121-91-5
- 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. - Other names: 1,3-Benzenedicarboxylic acid; m-Benzenedicarboxylic acid; m-Phthalic acid; Benzene,1,3-dicarboxylic acid; Acide isophtalique; Kyselina isoftalova; IPA; m-Dicarboxybenzene; NSC 15310
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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
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 33.9 ± 0.2 | kcal/mol | C | Sabbah and Perez, 1999 |
Enthalpy of sublimation
| ΔsubH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 32.17 ± 0.38 | 450. | ME | Kozyro, Maksimuk, et al., 2000 | Based on data from 424. to 476. K. |
| 27.29 | 508. | A | Stephenson and Malanowski, 1987 | Based on data from 493. to 563. K. See also Kraus, Beranek, et al., 1962. |
| 25.50 ± 0.53 | 523. | GS | Kraus, Beranek, et al., 1962 | Based on data from 493. to 563. K. See also Cox and Pilcher, 1970. |
Enthalpy of fusion
| ΔfusH (kcal/mol) | Temperature (K) | Method | Reference |
|---|---|---|---|
| 10.3 | 617.4 | DTA | Sabbah and Perez, 1999 |
References
Go To: Top, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Sabbah and Perez, 1999
Sabbah, Raphaël; Perez, Laurence,
Étude thermodynamique des acides phtalique, isophtalique et téréphtalique,
Revue canadienne de chimie, 1999, 77, 9, 1508-1513, https://doi.org/10.1139/cjc-77-9-1508
. [all data]
Kozyro, Maksimuk, et al., 2000
Kozyro, A.A.; Maksimuk, Yu.V.; Kabo, G.Ya.,
Thermodynamics of vaporization of phthalic acids and additivity of enthalpies and entropies of sublimation of benzocarboxylic acids,
Zh. Prikl. Khim. (S.-Peterburg), 2000, 73, 2, 199. [all data]
Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw,
Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2
. [all data]
Kraus, Beranek, et al., 1962
Kraus, M.; Beranek, L.; Kochloeff, K.; Bazant, V.,
Chem. Prum., 1962, 12, 649. [all data]
Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G.,
Thermochemistry of Organic and Organometallic Compounds, Academic Press Inc., London, 1970, 643. [all data]
Notes
Go To: Top, Phase change data, References
- Symbols used in this document:
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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