Imidodicarbonic diamide
- Formula: C2H5N3O2
- Molecular weight: 103.0800
- IUPAC Standard InChI: InChI=1S/C2H5N3O2/c3-1(6)5-2(4)7/h(H5,3,4,5,6,7)
- IUPAC Standard InChIKey: OHJMTUPIZMNBFR-UHFFFAOYSA-N
- CAS Registry Number: 108-19-0
- 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: Allophanamide; Allophanic acid amide; Allophanimidic acid; Biuret; Carbamylurea; Dicarbamylamine; Isobiuret; Urea, (aminocarbonyl)-; Ureidoformamide; L-101; NSC 8020
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Phase change data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -104.4 ± 0.67 | kcal/mol | Ccb | Kozyro, Frenkel, et al., 1988 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change data, 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 | -134.72 ± 0.51 | kcal/mol | Ccb | Kozyro, Frenkel, et al., 1988 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°solid | -224.18 ± 0.50 | kcal/mol | Ccb | Kozyro, Frenkel, et al., 1988 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid,1 bar | 34.92 | cal/mol*K | N/A | Luff and Reed, 1982 | DH |
| S°solid,1 bar | 34.92 | cal/mol*K | N/A | Kozyro, Frenkel', et al., 1988 | DH |
Constant pressure heat capacity of solid
| Cp,solid (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 31.38 | 298.15 | Kozyro, Frenkel', et al., 1988 | T = 240 to 450 K.; DH |
| 31.38 | 298.15 | Luff and Reed, 1982 | T = 5 to 320 K.; DH |
Phase change data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, 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 |
|---|---|---|---|---|---|
| ΔsubH° | 30.28 ± 0.45 | kcal/mol | V | Kozyro, Frenkel, et al., 1988 | ALS |
Enthalpy of phase transition
| ΔHtrs (kcal/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 0.232 | 372. | crystaline, II | crystaline, I | Kozyro, Frenkel', et al., 1988 | DH |
Entropy of phase transition
| ΔStrs (cal/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 0.607 | 372. | crystaline, II | crystaline, I | Kozyro, Frenkel', et al., 1988 | DH |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Kozyro, Frenkel, et al., 1988
Kozyro, A.A.; Frenkel, M.L.; Krasulin, A.P.; Simirskii, V.V.; Kabo, G.Ya.,
Thermodynamic properties of biuret in different states of aggregation,
Russ. J. Phys. Chem. (Engl. Transl.), 1988, 62, 897-899. [all data]
Luff and Reed, 1982
Luff, B.B.; Reed, R.B.,
Low-temperature heat capacity and entropy of oxalic acid and of biuret,
J. Chem. Eng. Data, 1982, 27, 290-292. [all data]
Kozyro, Frenkel', et al., 1988
Kozyro, A.A.; Frenkel', M.L.; Krasulin, A.P.; Simirskii, V.V.; Kabo, G.Ya.,
Thermodynamic properties of biuret in different states of aggregation,
Zhur. Fiz. Khim., 1988, 62, 1752-1756. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change 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) ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition ΔcH°solid Enthalpy of combustion of solid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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