Urea, N,N'-dimethyl-
- Formula: C3H8N2O
- Molecular weight: 88.1084
- IUPAC Standard InChIKey: MGJKQDOBUOMPEZ-UHFFFAOYSA-N
- CAS Registry Number: 96-31-1
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Species with the same structure:
- Other names: Urea, 1,3-dimethyl-; sym-Dimethylurea; N,N'-Dimethylurea; Symmetric dimethylurea; 1,3-Dimethylurea; (CH3NH)2CO; 1,1'-Dimethylurea; DMU; N,N'-Dimethylharnstoff; NSC 14910
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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 |
---|---|---|---|---|---|
Tboil | 542.2 | K | N/A | Weast and Grasselli, 1989 | BS |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 377.5 | K | N/A | Davies, Finch, et al., 1991 | Uncertainty assigned by TRC = 0.5 K; TRC |
Tfus | 379.5 | K | N/A | DellaGatta and Ferro, 1987 | Uncertainty assigned by TRC = 0.2 K; TRC |
Tfus | 379.9 | K | N/A | Zordan, Hurkot, et al., 1972 | Uncertainty assigned by TRC = 0.1 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 371.0 | K | N/A | Kabo, Miroshnichenko, et al., 1990 | Uncertainty assigned by TRC = 0.00001 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔsubH° | 89.3 ± 0.4 | kJ/mol | GS | Emel'yanenko, Kabo, et al., 2006 | Based on data from 313. to 357. K.; AC |
Enthalpy of sublimation
ΔsubH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
87.6 ± 1.0 | 347. | ME | Zaitsau, Kabo, et al., 2003 | Based on data from 317. to 377. K.; AC |
87.5 ± 1.0 | 350. | ME | Zaitsau, Kabo, et al., 2003 | Based on data from 317. to 377. K.; AC |
86.6 ± 0.5 | 350. | C | Zaitsau, Kabo, et al., 2003 | AC |
92.1 ± 1.0 | 354. | C | Kabo, Miroshnichenko, et al., 1990, 2 | ALS |
87.2 ± 0.6 | 353. | TE | Piacente, Ferro, et al., 1990 | Based on data from 316. to 373. K. See also Ferro, Barone, et al., 1987.; AC |
Enthalpy of fusion
ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
13.620 | 379.5 | Della Gatta and Ferro, 1987 | DH |
Entropy of fusion
ΔfusS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
35.9 | 379.5 | Della Gatta and Ferro, 1987 | DH |
References
Go To: Top, Phase change data, Notes
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]
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, 243-50. [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
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]
Notes
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- Symbols used in this document:
Tboil Boiling point Tfus Fusion (melting) point Ttriple Triple point temperature ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔsubH Enthalpy of sublimation ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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