Diazene, bis(4-butoxyphenyl)-, 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:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Ttriple377.2KN/AParkhomenko, Pivovarov, et al., 1990Nemactic liquid crystal phase; Uncertainty assigned by TRC = 0.8 K; meas. in Calvet microcalorimter, DAK-1; TRC
Ttriple375.2KN/AArnold, 1964Smectic liquid crystal phase; Uncertainty assigned by TRC = 0.1 K; TRC

Enthalpy of phase transition

ΔHtrs (kJ/mol) Temperature (K) Initial Phase Final Phase Reference Comment
10.440315.5crystaline, IVcrystaline, IIIBamezai, Godlewska, et al., 1990DH
0.930323.4crystaline, IIIcrystaline, IIBamezai, Godlewska, et al., 1990DH
1.570360.5crystaline, IIcrystaline, IBamezai, Godlewska, et al., 1990DH
20.960376.7crystaline, IliquidBamezai, Godlewska, et al., 1990c,I to nematic liquid.; DH

Entropy of phase transition

ΔStrs (J/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
33.09315.5crystaline, IVcrystaline, IIIBamezai, Godlewska, et al., 1990DH
2.88323.4crystaline, IIIcrystaline, IIBamezai, Godlewska, et al., 1990DH
4.36360.5crystaline, IIcrystaline, IBamezai, Godlewska, et al., 1990DH
55.64376.7crystaline, IliquidBamezai, Godlewska, et al., 1990c,I; DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


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.

Parkhomenko, Pivovarov, et al., 1990
Parkhomenko, V.D.; Pivovarov, A.A.; Sytnik, S.V., Thermophysical properties of oxamide, Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol., 1990, 33, 6, 53-5. [all data]

Arnold, 1964
Arnold, H., Calorimetry of crystalline-liquid materials: II results of the measurements on 12 homologous dialkoxy azeoxy benzenes, Z. Phys. Chem. (Leipzig), 1964, 226, 146. [all data]

Bamezai, Godlewska, et al., 1990
Bamezai, R.K.; Godlewska, M.; Massalska-arodz, M.; Sciesinski, J.; Witko, W., The adiabatic calorimetry study of the polymorphism of solid 4,4'-di-n-butyloxyazoxybenzene, Phase Transitions, 1990, 27(2-3), 113-119. [all data]


Notes

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