Diazene, bis(4-ethoxyphenyl)-, 1-oxide
- Formula: C16H18N2O3
- Molecular weight: 286.3257
- IUPAC Standard InChI: InChI=1S/C16H18N2O3/c1-3-20-15-9-5-13(6-10-15)17-18(19)14-7-11-16(12-8-14)21-4-2/h5-12H,3-4H2,1-2H3
- IUPAC Standard InChIKey: QUICZVHSJNKDBL-UHFFFAOYSA-N
- CAS Registry Number: 4792-83-0
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Azoxybenzene, 4,4'-diethoxy-; p,p'-Azoxyphenetole; 4,4'-Azoxydiphenetole; 4,4'-Azoxyphenetole; 4,4'-Bis(ethoxy)azoxybenzene; 4,4'-Diethoxyazoxybenzene; p-Azoxyphenetole; p,p'-Azoxydiphenetole; p,p'-Diethoxyazoxybenzene; Azoxyphenetole; NSC 142006; p,p'-Diethyloxyazoxybenzene; PAP; Phenetole, 4,4'-azoxydi-
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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 | -8.94 ± 0.88 | kcal/mol | Ccb | Acree, Tucker, et al., 1993 |
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:
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 | -39.10 ± 0.62 | kcal/mol | Ccb | Acree, Tucker, et al., 1993 | ALS |
| ΔfH°solid | -10.9 | kcal/mol | Ccb | Lemoul, 1908 | ALS |
| ΔfH°solid | -10.96 | kcal/mol | Ccb | Lemoult, 1906 | Author value for hf298-condensed=21.1 kcal/mol; ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°solid | -2080.5 ± 0.36 | kcal/mol | Ccb | Acree, Tucker, et al., 1993 | ALS |
| ΔcH°solid | -2108.7 | kcal/mol | Ccb | Lemoul, 1908 | ALS |
| ΔcH°solid | -2108.7 | kcal/mol | Ccb | Lemoult, 1906 | Author value for hf298-condensed=21.1 kcal/mol; ALS |
Constant pressure heat capacity of liquid
| Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 145. | 430. | Kreutzer, 1938 | Value a few degrees below anisotropic-isotropic liquid-liquid transition at 436 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
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 30.16 ± 0.65 | kcal/mol | C | Acree, Tucker, et al., 1993 | ALS |
| ΔsubH° | 30.16 ± 0.65 | kcal/mol | C | Acree, 1993 | AC |
Enthalpy of fusion
| ΔfusH (kcal/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 6.4532 | 406.5 | Acree, Tucker, et al., 1993 | DH |
Enthalpy of phase transition
| ΔHtrs (kcal/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 0.4063 | 438.5 | liquid | liquid | Acree, Tucker, et al., 1993 | Nematic/liq.; 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.
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]
Lemoul, 1908
Lemoul, M.P.,
Recherches theoriques et experimentals sur les chaleurs de combustion et de formation des couposes organiques,
Anal. Chem., 1908, 184-190. [all data]
Lemoult, 1906
Lemoult, M.P.,
Thermochimie. - Chaleur de combustion et de formation de quelques composes cycliques azotes,
Compt. Rend., 1906, 143, 772-775. [all data]
Kreutzer, 1938
Kreutzer, C.,
Kalorimetrische Messungen beim Übergang von der anisotropen zur isotropen flüssigen Phase,
Ann. Physik. [5]33, 1938, 192-209. [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]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, References
- Symbols used in this document:
Cp,liquid Constant pressure heat capacity of liquid ΔHtrs Enthalpy 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 ΔfusH Enthalpy of fusion ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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