Piperazine
- Formula: C4H10N2
- Molecular weight: 86.1356
- IUPAC Standard InChI: InChI=1S/C4H10N2/c1-2-6-4-3-5-1/h5-6H,1-4H2
- IUPAC Standard InChIKey: GLUUGHFHXGJENI-UHFFFAOYSA-N
- CAS Registry Number: 110-85-0
- 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) - Other names: Hexahydropyrazine; Antiren; Diethylenediamine; Diethyleneimine; Dispermine; Eraverm; Lumbrical; Piperazidine; Pipersol; Pyrazine hexahydride; Pyrazine, hexahydro-; Uvilon; Worm-A-Ton; Wurmirazin; 1,4-Diazacyclohexane; 1,4-Piperazine; 1,4-Diethylenediamine; Hexahydro-1,4-diazine; Piperazine, anhydrous; Asca-Trol No. 3; Piperazin; UN 2579; Vermex; Upixon; NSC 474
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Gas phase thermochemistry data
Go To: Top, 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
DRB - Donald R. Burgess, Jr.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | 6.0 ± 1.5 | kcal/mol | Ccb | An, Zhang, et al., 1981 | ALS |
| ΔfH°gas | 5.07 | kcal/mol | N/A | Bedford, Beezer, et al., 1963 | Value computed using ΔfHsolid° value of -45.6±1.6 kj/mol from Bedford, Beezer, et al., 1963 and ΔsubH° value of 66.8 kj/mol from An, Zhang, et al., 1981.; DRB |
Condensed phase thermochemistry data
Go To: Top, Gas 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:
DH - Eugene S. Domalski and Elizabeth D. Hearing
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°solid | -9.99 ± 0.27 | kcal/mol | Ccb | An, Zhang, et al., 1981 | ALS |
| ΔfH°solid | -10.90 ± 0.38 | kcal/mol | Ccb | Bedford, Beezer, et al., 1963 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°solid | -707.79 ± 0.27 | kcal/mol | Ccb | An, Zhang, et al., 1981 | ALS |
| ΔcH°solid | -706.88 ± 0.38 | kcal/mol | Ccb | Bedford, Beezer, et al., 1963 | ALS |
Constant pressure heat capacity of liquid
| Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 56.6 | 413. | Bobylev, Kamskaya, et al., 1988 | T = 413 to 473 K.; DH |
References
Go To: Top, Gas phase thermochemistry data, 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.
An, Zhang, et al., 1981
An, X.-W.; Zhang, Z.-L.; Wang, S.-N.; Yan, J.-Q.; Hu, R.-H.,
Investigation on bond energies: the heat of combustion of hippuric acid, piperazine and azacycloheptane,
Acta Chim. Sin., 1981, 39, 485-492. [all data]
Bedford, Beezer, et al., 1963
Bedford, A.F.; Beezer, A.E.; Mortimer, C.T.,
Heats of formation and bond energies. Part X. 1,2,5,6-tetrahydropyridine, piperidine, and piperazine,
J. Chem. Soc., 1963, 2039-2043. [all data]
Bobylev, Kamskaya, et al., 1988
Bobylev, V.A.; Kamskaya, O.I.; Kossoi, A.A.; Koludarova, E.Yu.,
Investigation of the heat capacity of ethyleneamines by differential scanning calorimetry,
Zhur. Obshch. Khim., 1988, 58, 2536-2538. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, References
- Symbols used in this document:
Cp,liquid Constant pressure heat capacity of liquid 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 - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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