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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:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny, director
AC - William E. Acree, Jr., James S. Chickos
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
Tfus342.3KN/ADellaGatta and Ferro, 1987Uncertainty assigned by TRC = 0.4 K; TRC
Tfus348.430KN/AKrasulin, Kozyro, et al., 1986Crystal phase 1 phase; Uncertainty assigned by TRC = 0.02 K; TRC
Quantity Value Units Method Reference Comment
Ttriple348.0KN/AKabo, Miroshnichenko, et al., 1990Uncertainty assigned by TRC = 0.00001 K; TRC
Quantity Value Units Method Reference Comment
Deltasub22.9 ± 0.2kcal/molGSEmel'yanenko, Kabo, et al., 2006Based on data from 312. - 339. K.; AC

Enthalpy of sublimation

DeltasubH (kcal/mol) Temperature (K) Method Reference Comment
23.136326.N/AKrasulin, Kozyro, et al., 1986, 2DH
22.8 ± 0.2324.MEZaitsau, Kabo, et al., 2003Based on data from 305. - 347. K.; AC
22.7 ± 0.2350.MEZaitsau, Kabo, et al., 2003Based on data from 305. - 347. K.; AC
22.6 ± 0.05350.CZaitsau, Kabo, et al., 2003AC
23.9 ± 0.26320.CKabo, Miroshnichenko, et al., 1990, 2see Simirsky, Kabo, et al., 1987; ALS

Entropy of sublimation

DeltasubS (cal/mol*K) Temperature (K) Reference Comment
70.96326.Krasulin, Kozyro, et al., 1986, 2DH

Enthalpy of fusion

DeltafusH (kcal/mol) Temperature (K) Reference Comment
4.0105342.3Della Gatta and Ferro, 1987DH
4.011342.3Acree, 1991See also Kabo, Kozyro, et al., 1995 and Kabo, Miroshnichenko, et al., 1990, 2.; AC

Entropy of fusion

DeltafusS (cal/mol*K) Temperature (K) Reference Comment
11.7342.3Della Gatta and Ferro, 1987DH

Enthalpy of phase transition

DeltaHtrs (kcal/mol) Temperature (K) Initial Phase Final Phase Reference Comment
0.4780195. - 225.crystaline, IIcrystaline, IKrasulin, Kozyro, et al., 1986, 2Reversible transition.; DH
3.8480384.43crystaline, IliquidKrasulin, Kozyro, et al., 1986, 2DH

Entropy of phase transition

DeltaStrs (cal/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
2.30195. - 225.crystaline, IIcrystaline, IKrasulin, Kozyro, et al., 1986, 2Reversible; DH
10.0384.43crystaline, IliquidKrasulin, Kozyro, et al., 1986, 2DH

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.

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]

Krasulin, Kozyro, et al., 1986
Krasulin, A.P.; Kozyro, A.A.; Dalidovich, S.V., Thermodynamic properties of N,N-diethylurea, Zh. Fiz. Khim., 1986, 60, 2580-3. [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]

Krasulin, Kozyro, et al., 1986, 2
Krasulin, A.P.; Kozyro, A.A.; Dalidovich, S.V., Thermodynamic properties of N,N-diethylurea, Zhur. Fiz. Khim., 1986, 60, 2580-2583. [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]

Simirsky, Kabo, et al., 1987
Simirsky, V.V.; Kabo, G.J.; Frenkel, M.L., Additivity of the enthalpies of formation of urea derivatives in the crystalline state, J. Chem. Thermodyn., 1987, 19, 1121-1127. [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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