Diazene, bis(4-methoxyphenyl)-, 1-oxide
- Formula: C14H14N2O3
- Molecular weight: 258.2726
- IUPAC Standard InChI: InChI=1S/C14H14N2O3/c1-18-13-7-3-11(4-8-13)15-16(17)12-5-9-14(19-2)10-6-12/h3-10H,1-2H3
- IUPAC Standard InChIKey: KAEZRSFWWCTVNP-UHFFFAOYSA-N
- CAS Registry Number: 1562-94-3
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Azoxybenzene, 4,4'-dimethoxy-; p-Azoxyanisole; p-Azoxydianisole; p,p'-Azoxyanisole; p,p'-Azoxydianisole; 4,4'-Azoxyanisole; 4,4'-Azoxydianisole; 4,4'-Dimethoxyazoxybenzene; Azoxy-bis(4-methoxybenzene); p,p'-Dimethoxyazoxybenzene; PAA; Diazene, 1,2-bis(4-methoxyphenyl)-, 1-oxide; NSC 7959
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Phase change 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:
AC - William E. Acree, Jr., James S. Chickos
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° | 134.8 ± 3.7 | kJ/mol | C | Acree, Tucker, et al., 1993 | ALS |
| ΔsubH° | 134.8 ± 3.7 | kJ/mol | C | Acree, 1993 | AC |
Enthalpy of vaporization
| ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 73.7 | 406. | A | Stephenson and Malanowski, 1987 | Based on data from 395. to 418. K.; AC |
Enthalpy of fusion
| ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 29.300 | 391.7 | Acree, Tucker, et al., 1993 | DH |
| 20.630 | 377.2 | Kuznetsov, Vasiliskov, et al., 1990 | Crystal to nematic liquid.; DH |
Temperature of phase transition
| Ttrs (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|
| 335.6 | crystaline, II | crystaline, I | Jaiswal, 1982 | DH |
Enthalpy of phase transition
| ΔHtrs (kJ/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 1.000 | 410.7 | liquid | liquid | Acree, Tucker, et al., 1993 | Nematic/liq.; DH |
| 1.334 | 411.6 | liquid | liquid | Kuznetsov, Vasiliskov, et al., 1990 | Nematic to isotropic liquid.; DH |
| 0.1046 | 250.7 | crystaline, III | crystaline, I | Jaiswal, 1982 | DH |
| 23.891 | 377.5 | crystaline, II | liquid | Jaiswal, 1982 | DH |
| 30.430 | 388.0 | crystaline, I | liquid | Jaiswal, 1982 | DH |
| 0.757 | 406.9 | liquid | liquid | Jaiswal, 1982 | DH |
| 30.367 | 390.8 | crystaline, I | liquid | Barral, Porter, et al., 1967 | DH |
| 0.736 | 407.1 | liquid | liquid | Barral, Porter, et al., 1967 | DH |
Entropy of phase transition
| ΔStrs (J/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 0.42 | 250.7 | crystaline, III | crystaline, I | Jaiswal, 1982 | DH |
| 63.30 | 377.5 | crystaline, II, Crystal II | liquid, nematic | Jaiswal, 1982 | DH |
| 78.41 | 388.0 | crystaline, I, Crystal I | liquid, nematic | Jaiswal, 1982 | DH |
| 1.84 | 406.9 | liquid, Nematic | liquid, isotropic | Jaiswal, 1982 | DH |
| 77.7 | 390.8 | crystaline, I, Solid | liquid, nematic transition | Barral, Porter, et al., 1967 | DH |
| 1.8 | 407.1 | liquid, Nematic liquid | liquid, isotropic | Barral, Porter, et al., 1967 | 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.
Acree, Tucker, et al., 1993
Acree, W.E., Jr.; Tucker, S.A.; Pilcher, G.; Paz Andrade, M.I.; Ribeiro da Silva, M.D.M.C.,
Enthalpies of combustion of p-azoxyanisole p-azoxyphenetole: the dissociation enthalpy of the N-O bonds. Enthalpies of crystal-to-(liquid crystal) transitions,
J. Chem. Thermodyn., 1993, 25, 653-659. [all data]
Acree, 1993
Acree, W.,
Enthalpies of combustion of p-azoxyanisole and p-azoxyphenetole: the dissociation enthalpy of the N-O bonds. Enthalpies of crystal-to-(liquid crystal) transitions,
The Journal of Chemical Thermodynamics, 1993, 25, 5, 653-659, https://doi.org/10.1006/jcht.1993.1062
. [all data]
Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw,
Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2
. [all data]
Kuznetsov, Vasiliskov, et al., 1990
Kuznetsov, V.S.; Vasiliskov, Yu.G.; Makarov, B.N.; Kozlov, V.A.,
Feasibility of determination of heats of phase transitions in liquid crystals in a DAK-type microcalorimeter, Izv. Vyssh. Uchebn. Zaved.,
Khim. Khim. Tekhnol., 1990, 33(1), 125-127. [all data]
Jaiswal, 1982
Jaiswal, A.K.,
Solid polymorphs of p-azoxyanisole (PAA),
Natl. Acad. Sci. Lett. (India), 1982, 5, 23-25. [all data]
Barral, Porter, et al., 1967
Barral, E.M., II; Porter, R.S.; Johnson, J.F.,
Specific heats of nematic, smectic, and cholesteric liquid crystals by differential scanning calorimetry,
J. Phys. Chem., 1967, 71, 895-900. [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 ΔStrs Entropy of phase transition ΔfusH Enthalpy of fusion ΔsubH° Enthalpy of sublimation at standard conditions ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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