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Diazene, bis(4-methoxyphenyl)-, 1-oxide

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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
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
Deltasub32.22 ± 0.88kcal/molCAcree, Tucker, et al., 1993ALS
Deltasub32.22 ± 0.88kcal/molCAcree, 1993AC

Enthalpy of vaporization

DeltavapH (kcal/mol) Temperature (K) Method Reference Comment
17.6406.AStephenson and Malanowski, 1987Based on data from 395. - 418. K.; AC

Enthalpy of fusion

DeltafusH (kcal/mol) Temperature (K) Reference Comment
7.0029391.7Acree, Tucker, et al., 1993DH
4.9307377.2Kuznetsov, Vasiliskov, et al., 1990Crystal to nematic liquid.; DH

Temperature of phase transition

Ttrs (K) Initial Phase Final Phase Reference Comment
335.6crystaline, IIcrystaline, IJaiswal, 1982DH

Enthalpy of phase transition

DeltaHtrs (kcal/mol) Temperature (K) Initial Phase Final Phase Reference Comment
0.2390410.7liquidliquidAcree, Tucker, et al., 1993Nematic/liq.; DH
0.3188411.6liquidliquidKuznetsov, Vasiliskov, et al., 1990Nematic to isotropic liquid.; DH
0.02500250.7crystaline, IIIcrystaline, IJaiswal, 1982DH
5.7101377.5crystaline, IIliquidJaiswal, 1982DH
7.2729388.0crystaline, IliquidJaiswal, 1982DH
0.181406.9liquidliquidJaiswal, 1982DH
7.2579390.8crystaline, IliquidBarral, Porter, et al., 1967DH
0.176407.1liquidliquidBarral, Porter, et al., 1967DH

Entropy of phase transition

DeltaStrs (cal/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
0.10250.7crystaline, IIIcrystaline, IJaiswal, 1982DH
15.13377.5crystaline, II, Crystal IIliquid, nematicJaiswal, 1982DH
18.74388.0crystaline, I, Crystal Iliquid, nematicJaiswal, 1982DH
0.440406.9liquid, Nematicliquid, isotropicJaiswal, 1982DH
18.6390.8crystaline, I, Solidliquid, nematic transitionBarral, Porter, et al., 1967DH
0.43407.1liquid, Nematic liquidliquid, isotropicBarral, Porter, et al., 1967DH

References

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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

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