DL-Leucine
- Formula: C6H13NO2
- Molecular weight: 131.1729
- IUPAC Standard InChI: InChI=1S/C6H13NO2/c1-4(2)3-5(7)6(8)9/h4-5H,3,7H2,1-2H3,(H,8,9)
- IUPAC Standard InChIKey: ROHFNLRQFUQHCH-UHFFFAOYSA-N
- CAS Registry Number: 328-39-2
- 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. - Species with the same structure:
- Stereoisomers:
- Other names: Leucine, DL-; (.+/-.)-Leucine; (±)-Leucine; (.+-.)-Leucine
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- Other data available:
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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 | -153.13 ± 0.21 | kcal/mol | Ccb | Huffman, Fox, et al., 1937 | Author's hf298=-154.25 kcal/mol; ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°solid | -855.23 ± 0.21 | kcal/mol | Ccb | Huffman, Fox, et al., 1937 | Author's hf298=-154.25 kcal/mol; ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid,1 bar | 49.50 | cal/mol*K | N/A | Huffman and Ellis, 1937 | Extrapolation below 90 K, 58.20 J/mol*K.; DH |
Constant pressure heat capacity of solid
| Cp,solid (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 46.439 | 296.6 | Huffman and Ellis, 1937 | T = 86 to 297 K. Value is unsmoothed experimental datum.; 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.
Huffman, Fox, et al., 1937
Huffman, H.M.; Fox, S.W.; Ellis, E.L.,
Thermal data. VII. The heats of combustion of seven amino acids,
J. Am. Chem. Soc., 1937, 59, 2144-21. [all data]
Huffman and Ellis, 1937
Huffman, H.M.; Ellis, E.L.,
Thermal data. VIII. The heat capacities, entropies and free energies of some amino acids,
J. Am. Chem. Soc., 1937, 59, 2150-2152. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, References
- Symbols used in this document:
Cp,solid Constant pressure heat capacity of solid S°solid,1 bar Entropy of solid at standard conditions (1 bar) 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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