Urea, N,N'-diethyl-

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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:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
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
Tboil536.2KN/AWeast and Grasselli, 1989BS
Quantity Value Units Method Reference Comment
Tfus383.4KN/ADellaGatta and Ferro, 1987Uncertainty assigned by TRC = 0.5 K; TRC
Quantity Value Units Method Reference Comment
Ttriple385.KN/AKabo, Miroshnichenko, et al., 1990Uncertainty assigned by TRC = 0.00001 K; TRC
Quantity Value Units Method Reference Comment
Δsub95.4 ± 0.3kJ/molGSEmel'yanenko, Kabo, et al., 2006Based on data from 343. to 379. K.; AC

Enthalpy of sublimation

ΔsubH (kJ/mol) Temperature (K) Method Reference Comment
91.8 ± 0.9358.MEZaitsau, Kabo, et al., 2003Based on data from 323. to 384. K.; AC
92.3 ± 0.9350.MEZaitsau, Kabo, et al., 2003Based on data from 323. to 384. K.; AC
95.6 ± 0.6350.CZaitsau, Kabo, et al., 2003AC
96.9 ± 0.9354.CKabo, Miroshnichenko, et al., 1990, 2ALS
96.8 ± 0.9361.TEPiacente, Ferro, et al., 1990Based on data from 321. to 379. K. See also Ferro, Barone, et al., 1987.; AC

Enthalpy of fusion

ΔfusH (kJ/mol) Temperature (K) Reference Comment
12.460383.4Della Gatta and Ferro, 1987DH
12.46383.4Acree, 1991See also Kabo, Kozyro, et al., 1995 and Kabo, Miroshnichenko, et al., 1990, 2.; AC

Entropy of fusion

ΔfusS (J/mol*K) Temperature (K) Reference Comment
32.5383.4Della Gatta and Ferro, 1987DH

Enthalpy of phase transition

ΔHtrs (kJ/mol) Temperature (K) Initial Phase Final Phase Reference Comment
1.870339.4crystaline, IIcrystaline, IDella Gatta and Ferro, 1987DH

Entropy of phase transition

ΔStrs (J/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
55.1339.4crystaline, IIcrystaline, IDella Gatta and Ferro, 1987DH

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.

Weast and Grasselli, 1989
CRC Handbook of Data on Organic Compounds, 2nd Editon, Weast,R.C and Grasselli, J.G., ed(s)., CRC Press, Inc., Boca Raton, FL, 1989, 1. [all data]

DellaGatta and Ferro, 1987
DellaGatta, G.; Ferro, D., Enthalpies of fusion and solid-to-solid transition, entropies of fusion for urea and twelve alkylurea, Thermochim. Acta, 1987, 122, 143-52. [all data]

Kabo, Miroshnichenko, et al., 1990
Kabo, G.Ya.; Miroshnichenko, E.A.; Frenkel, M.L.; Kozyro, A.A.; Simirsky, V.V.; Krasulin, A.P.; Vorob'eva, V.P.; Lebedev, Yu.A., Thermochemistry of Alkyl Derivatives of Urea, Izv. Akad. Nauk SSSR, Ser. Khim., 1990, No. 4, 750-5. [all data]

Emel'yanenko, Kabo, et al., 2006
Emel'yanenko, Vladimir N.; Kabo, Gennady J.; Verevkin, Sergey P., Measurement and Prediction of Thermochemical Properties: Improved Increments for the Estimation of Enthalpies of Sublimation and Standard Enthalpies of Formation of Alkyl Derivatives of Urea, J. Chem. Eng. Data, 2006, 51, 1, 79-87, https://doi.org/10.1021/je050230z . [all data]

Zaitsau, Kabo, et al., 2003
Zaitsau, Dz; Kabo, G.J.; Kozyro, A.A.; Sevruk, V.M., The effect of the failure of isotropy of a gas in an effusion cell on the vapor pressure and enthalpy of sublimation for alkyl derivatives of carbamide, Thermochimica Acta, 2003, 406, 1-2, 17-28, https://doi.org/10.1016/S0040-6031(03)00231-4 . [all data]

Kabo, Miroshnichenko, et al., 1990, 2
Kabo, G.Ya.; Miroshnichenko, E.A.; Frenkel, M.L.; Kozyro, A.A.; Simirskii, V.V.; Krasulin, A.P.; Vorob'eva, V.P.; Lebedev, Yu.A., Thermochemistry of urea alkyl derivatives, Bull. Acad. Sci. USSR, Div. Chem. Sci., 1990, 662-667. [all data]

Piacente, Ferro, et al., 1990
Piacente, V.; Ferro, D.; Gatta, G. Della, Sublimation enthalpy of eleven alkyl derivatives of urea, Thermochimica Acta, 1990, 158, 1, 79-85, https://doi.org/10.1016/0040-6031(90)80054-3 . [all data]

Ferro, Barone, et al., 1987
Ferro, D.; Barone, G.; Della Gatta, G.; Piacente, V., Vapour pressures and sublimation enthalpies of urea and some of its derivatives, The Journal of Chemical Thermodynamics, 1987, 19, 9, 915-923, https://doi.org/10.1016/0021-9614(87)90038-3 . [all data]

Della Gatta and Ferro, 1987
Della Gatta, G.; Ferro, D., Enthalpies of fusion and solid-to-solid transition, entropies of fusion for urea and twelve alkylureas, Thermochim. Acta, 1987, 122, 143-152. [all data]

Acree, 1991
Acree, William E., Thermodynamic properties of organic compounds: enthalpy of fusion and melting point temperature compilation, Thermochimica Acta, 1991, 189, 1, 37-56, https://doi.org/10.1016/0040-6031(91)87098-H . [all data]

Kabo, Kozyro, et al., 1995
Kabo, Gennady J.; Kozyro, Alexander A.; Diky, Vladimir V.; Simirsky, Vladimir V., Additivity of Thermodynamic Properties of Organic Compounds in Crystalline State. 2. Heat Capacities and Enthalpies of Phase Transition of Alkyl Derivatives of Urea in Crystalline State, J. Chem. Eng. Data, 1995, 40, 2, 371-393, https://doi.org/10.1021/je00018a005 . [all data]


Notes

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