Alanine
- Formula: C3H7NO2
- Molecular weight: 89.0932
- IUPAC Standard InChI: InChI=1S/C3H7NO2/c1-2(4)3(5)6/h2H,4H2,1H3,(H,5,6)/t2-/m1/s1
- IUPAC Standard InChIKey: QNAYBMKLOCPYGJ-UWTATZPHSA-N
- CAS Registry Number: 56-41-7
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
View 3d structure (requires JavaScript / HTML 5) - Stereoisomers:
- Other names: L-Alanine; Alanine, L-; α-Alanine; α-Aminopropionic acid; (S)-Alanine; L-α-Alanine; L-α-Aminopropionic acid; L-(+)-Alanine; L-2-Aminopropanoic acid; L-2-Aminopropionic acid; Propanoic acid, 2-amino-; Propanoic acid, 2-amino-, (S)-; L-CH3CH(NH2)COOH; (S)-2-Aminopropanoic acid; 2-Aminopropanoic acid; 2-Aminopropionic acid; Ala; Ritalanine; NSC 206315; 2-Aminopropanoic acid, L-
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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:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
AC - William E. Acree, Jr., James S. Chickos
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 144.8 ± 4.2 | kJ/mol | C | Ngauv, Sabbah, et al., 1977 | ALS |
| ΔsubH° | 144.8 ± 4.2 | kJ/mol | N/A | Nguon Ngauv, Sabbah, et al., 1977 | AC |
Enthalpy of sublimation
| ΔsubH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 133. ± 1. | 414. | TE,ME | de Kruif, Voogd, et al., 1979 | AC |
| 132.4 ± 1.3 | 433. | C | Nguon Ngauv, Sabbah, et al., 1977 | Based on data from 413. to 450. K.; AC |
| 138. ± 0.8 | 455. | V | Svec and Clyde, 1965 | ALS |
Ion clustering 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: Robert C. Dunbar
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.
Clustering reactions
+
= (
•
)
By formula: Na+ + C3H7NO2 = (Na+ • C3H7NO2)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 169. ± 13. | kJ/mol | IMRE | Gapeev and Dunbar, 2003 | Anchor glycine=38.5+-2.0 |
| ΔrH° | 167. | kJ/mol | CIDC | Kish, Ohanessian, et al., 2003 | Anchor alanine=39.89 |
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.
Ngauv, Sabbah, et al., 1977
Ngauv, S.N.; Sabbah, R.; Laffitte, M.,
Thermodynamique de composes azotes. III. Etude thermochimique de la glycine et de la l-α-alanine,
Thermochim. Acta, 1977, 20, 371-380. [all data]
Nguon Ngauv, Sabbah, et al., 1977
Nguon Ngauv, Song; Sabbah, Raphael; Laffitie, Marc,
Thermodynamique de composes azotes III. Etude Thermochimique de la glycine et de la l-α-alanine,
Thermochimica Acta, 1977, 20, 3, 371-380, https://doi.org/10.1016/0040-6031(77)85091-0
. [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]
Svec and Clyde, 1965
Svec, H.J.; Clyde, D.D.,
Vapor pressures of some α-amino acids,
J. Chem. Eng. Data, 1965, 10, 151. [all data]
Gapeev and Dunbar, 2003
Gapeev, A.; Dunbar, R.C.,
Na+ Affinities of Gas-Phase Amino Acids by Ligand Exchange Equilibrium,
Int. J. Mass Spectrom., 2003, 228, 2-3, 825, https://doi.org/10.1016/S1387-3806(03)00242-2
. [all data]
Kish, Ohanessian, et al., 2003
Kish, M.M.; Ohanessian, G.; Wesdemiotis, C.,
The Na+ affinities of a-amino acids: side-chain substituent effects,
Int. J. Mass Spectrom., 2003, 227, 3, 509, https://doi.org/10.1016/S1387-3806(03)00082-4
. [all data]
Notes
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- Symbols used in this document:
ΔrH° Enthalpy of reaction at standard conditions 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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