Urea, N,N'-dimethyl-

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Gas phase thermochemistry 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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity Value Units Method Reference Comment
Δfgas-52.96 ± 0.37kcal/molCcbKabo, Miroshnichenko, et al., 1990 

Condensed phase thermochemistry 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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity Value Units Method Reference Comment
Δfsolid-74.59 ± 0.67kcal/molCcbDavies, Finch, et al., 1991 
Δfsolid-74.97 ± 0.28kcal/molCcbKabo, Miroshnichenko, et al., 1990 
Quantity Value Units Method Reference Comment
Δcsolid-480.81 ± 0.67kcal/molCcbDavies, Finch, et al., 1991 
Δcsolid-480.44 ± 0.27kcal/molCcbKabo, Miroshnichenko, et al., 1990 

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
Tboil542.2KN/AWeast and Grasselli, 1989BS
Quantity Value Units Method Reference Comment
Tfus377.5KN/ADavies, Finch, et al., 1991, 2Uncertainty assigned by TRC = 0.5 K; TRC
Tfus379.5KN/ADellaGatta and Ferro, 1987Uncertainty assigned by TRC = 0.2 K; TRC
Tfus379.9KN/AZordan, Hurkot, et al., 1972Uncertainty assigned by TRC = 0.1 K; TRC
Quantity Value Units Method Reference Comment
Ttriple371.0KN/AKabo, Miroshnichenko, et al., 1990, 2Uncertainty assigned by TRC = 0.00001 K; TRC
Quantity Value Units Method Reference Comment
Δsub21.3 ± 0.1kcal/molGSEmel'yanenko, Kabo, et al., 2006Based on data from 313. to 357. K.; AC

Enthalpy of sublimation

ΔsubH (kcal/mol) Temperature (K) Method Reference Comment
20.9 ± 0.24347.MEZaitsau, Kabo, et al., 2003Based on data from 317. to 377. K.; AC
20.9 ± 0.24350.MEZaitsau, Kabo, et al., 2003Based on data from 317. to 377. K.; AC
20.7 ± 0.1350.CZaitsau, Kabo, et al., 2003AC
22.01 ± 0.24354.CKabo, Miroshnichenko, et al., 1990ALS
20.8 ± 0.1353.TEPiacente, Ferro, et al., 1990Based on data from 316. to 373. K. See also Ferro, Barone, et al., 1987.; AC

Enthalpy of fusion

ΔfusH (kcal/mol) Temperature (K) Reference Comment
3.2553379.5Della Gatta and Ferro, 1987DH

Entropy of fusion

ΔfusS (cal/mol*K) Temperature (K) Reference Comment
8.58379.5Della 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

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.

Kabo, Miroshnichenko, et al., 1990
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]

Davies, Finch, et al., 1991
Davies, R.H.; Finch, A.; Hill, J.O., The thermochemistry of 1,3-dimethylurea and 1,3-dimethylurea nitrate, Thermochim. Acta, 1991, 184, 243-250. [all data]

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]

Davies, Finch, et al., 1991, 2
Davies, R.H.; Finch, A.; Hill, J.O., The thermochemistry of 1,3-dimethylurea and 1,3-dimethylurea nitrate, Thermochim. Acta, 1991, 184, 243-50. [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]

Zordan, Hurkot, et al., 1972
Zordan, T.A.; Hurkot, D.G.; Peterson, M.; Hepler, L.G., Enthalpies and entropies of melting from differential scanning calorimetry and freezing point depressions: urea, methylurea, 1, 1-dimethylurea, 1, 3- dimethylurea, tetramethylurea, and thiourea, Thermochim. Acta, 1972, 5, 21. [all data]

Kabo, Miroshnichenko, et al., 1990, 2
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]

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]


Notes

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