Cyclotetramethylenetetranitramine
- Formula: C4H8N8O8
- Molecular weight: 296.1551
- IUPAC Standard InChI: InChI=1S/C4H8N8O8/c13-9(14)5-1-6(10(15)16)3-8(12(19)20)4-7(2-5)11(17)18/h1-4H2
- IUPAC Standard InChIKey: UZGLIIJVICEWHF-UHFFFAOYSA-N
- CAS Registry Number: 2691-41-0
- 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: Octogen; 1,3,5,7-Tetrazocine, octahydro-1,3,5,7-tetranitro-; HMX; Octahydro-1,3,5,7-Tetranitro-s-tetrazocine; Octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine; Oktogen; Tetramethylenetetranitramine; 1,3,5,7-Tetranitro-1,3,5,7-tetraazacyclooctane; 1,3,5,7-Tetraza-1,3,5,7-tetranitrocyclooctane; β Hmy; HW 4; LX 14-0; Octagen
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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:
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing
Enthalpy of sublimation
| ΔsubH (kJ/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 161.9 | 474. | Taylor and Crookes, 1976 | Based on data from 461. - 487. K.; AC |
Enthalpy of fusion
| ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 69.873 | 553.15 | Maksimov, 1992 | DH |
Temperature of phase transition
| Ttrs (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|
| 551. | crystaline, I | liquid | Hall, 1971 | DH |
Enthalpy of phase transition
| ΔHtrs (kJ/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 7.950 | 471. | crystaline, II | crystaline, I | Hall, 1971 | α to δ transition, approximation.; DH |
| 9.832 | 460. | crystaline, III | crystaline, I | Hall, 1971 | β to δ transition.; DH |
References
Go To: Top, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Taylor and Crookes, 1976
Taylor, John Watson; Crookes, Roy J.,
Vapour pressure and enthalpy of sublimation of 1,3,5,7-tetranitro-1,3,5,7-tetra-azacyclo-octane (HMX),
J. Chem. Soc., Faraday Trans. 1, 1976, 72, 0, 723, https://doi.org/10.1039/f19767200723
. [all data]
Maksimov, 1992
Maksimov, Yu.Ya.,
Boiling point and enthalpy of evaporation of liquid hexogen and octogen,
Zhur. Fiz. Khim., 1992, 66(2), 540-542. [all data]
Hall, 1971
Hall, P.G.,
Thermal decomposition and phase transitions in solid nitramines,
Trans. Faraday Soc., 1971, 67(3), 556-562. [all data]
Notes
Go To: Top, Phase change data, References
- Symbols used in this document:
Ttrs Temperature of phase transition ΔHtrs Enthalpy of phase transition ΔfusH Enthalpy of fusion ΔsubH Enthalpy of sublimation - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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