Cytosine
- Formula: C4H5N3O
- Molecular weight: 111.1020
- IUPAC Standard InChI: InChI=1S/C4H5N3O/c5-3-1-2-6-4(8)7-3/h1-2H,(H3,5,6,7,8)
- IUPAC Standard InChIKey: OPTASPLRGRRNAP-UHFFFAOYSA-N
- CAS Registry Number: 71-30-7
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: 2(1H)-Pyrimidinone, 4-amino-; Cyt; Cytosinimine; 4-Amino-2(1H)-pyrimidinone; 4-Amino-2-hydroxypyrimidine; 4-Amino-2(1H)pyrimidone; 4-Amino-2-oxypyrimidine
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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 | -52.89 ± 0.55 | kcal/mol | Ccb | Wilson, Watson, et al., 1979 | ALS |
| ΔfH°solid | -56.27 ± 0.11 | kcal/mol | Ccr | Sabbah, Nabavian, et al., 1977 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°solid | -494.10 ± 0.48 | kcal/mol | Ccb | Wilson, Watson, et al., 1979 | ALS |
| ΔcH°solid | -490.722 ± 0.088 | kcal/mol | Ccr | Sabbah, Nabavian, et al., 1977 | ALS |
Constant pressure heat capacity of solid
| Cp,solid (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 31.69 | 298. | Kilday, 1978 | 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.
Wilson, Watson, et al., 1979
Wilson, S.R.; Watson, I.D.; Malcolm, G.N.,
Enthalpies of formation of solid cytosine, L-histidine, and uracil,
J. Chem. Thermodyn., 1979, 11, 911-912. [all data]
Sabbah, Nabavian, et al., 1977
Sabbah, R.; Nabavian, M.; Laffitte, M.,
Sur l'enthalpie de formation de la cytosine a 1'etat solide.,
C. R. Acad. Sci. Paris, 1977, 284, 953-954. [all data]
Kilday, 1978
Kilday, M.V.,
Enthalpies of solution of the nucleic acid bases. 3. Cytosine in water,
J. Res., 1978, NBS 83, 539-546. [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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