Urea, tetramethyl-
- Formula: C5H12N2O
- Molecular weight: 116.1616
- IUPAC Standard InChIKey: AVQQQNCBBIEMEU-UHFFFAOYSA-N
- CAS Registry Number: 632-22-4
- 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. - Other names: Temur; Tetramethylurea; ((CH3)2N)2CO; 1,1,3,3-Tetramethylurea; TMU; Urea, 1,1,3,3-tetramethyl-; Tetramethyluree; N,N,N',N'-Tetramethylurea; NSC 91488; Urea, N,N,N',N'-tetramethyl-
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Gas phase thermochemistry data
Go To: Top, Phase change data, References, Notes
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 |
---|---|---|---|---|---|
ΔfH°gas | -205.6 ± 1.1 | kJ/mol | Ccb | Kabo, Miroshnichenko, et al., 1990 | see Simirsky, Kabo, et al., 1987 and Kozyro, Krasulin, et al., 1988 |
Phase change data
Go To: Top, Gas phase thermochemistry data, References, Notes
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
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 449.7 | K | N/A | Weast and Grasselli, 1989 | BS |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 272.2 | K | N/A | Kozyro, Krasulin, et al., 1988, 2 | Uncertainty assigned by TRC = 0.1 K; TRC |
Tfus | 272.0 | K | N/A | Zordan, Hurkot, et al., 1972 | Uncertainty assigned by TRC = 0.1 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 270.48 | K | N/A | Kabo, Kozyro, et al., 1995 | Uncertainty assigned by TRC = 0.02 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 56.6 ± 0.8 | kJ/mol | C | Kabo, Miroshnichenko, et al., 1990 | see Simirsky, Kabo, et al., 1987 and Kozyro, Krasulin, et al., 1988; ALS |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
41.7 | 450. | A,EB | Kneisl and Zondlo, 1987 | Based on data from 320. to 450. K.; AC |
52.2 | 325. | A,EB | Kneisl and Zondlo, 1987 | Based on data from 320. to 450. K.; AC |
Enthalpy of fusion
ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
13.400 | 272.2 | Kozyro, Krasulin, et al., 1988, 3 | DH |
13.400 | 272.2 | Kozyro, Krasulin, et al., 1988, 3 | DH |
14.0 | 272.1 | Jamróz, Dobrowolski, et al., 2001 | AC |
13.4 | 272.2 | Kabo, Kozyro, et al., 1995, 2 | See also Domalski and Hearing, 1996.; AC |
Entropy of fusion
ΔfusS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
49.2 | 272.2 | Kozyro, Krasulin, et al., 1988, 3 | DH |
49.2 | 272.2 | Kozyro, Krasulin, et al., 1988, 3 | DH |
References
Go To: Top, Gas 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]
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]
Kozyro, Krasulin, et al., 1988
Kozyro, A.A.; Krasulin, A.P.; Simirskii, V.V.; Markovnik, V.S.,
Thermodynamic properties of tetramethylurea,
Russ. J. Phys. Chem. (Engl. Transl.), 1988, 62, 895-897. [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]
Kozyro, Krasulin, et al., 1988, 2
Kozyro, A.A.; Krasulin, A.P.; Simirsky, V.V.; Markovnik, V.S.,
Thermodynamic properties of tetramethylurea,
Zh. Fiz. Khim., 1988, 62, 1747-52. [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, Kozyro, et al., 1995
Kabo, G.Ya.; Kozyro, A.A.; Diky, V.V.; Simirsky, V.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, 371-93. [all data]
Kneisl and Zondlo, 1987
Kneisl, Philip; Zondlo, John W.,
Vapor pressure, liquid density, and the latent heat of vaporization as functions of temperature for four dipolar aprotic solvents,
J. Chem. Eng. Data, 1987, 32, 1, 11-13, https://doi.org/10.1021/je00047a003
. [all data]
Kozyro, Krasulin, et al., 1988, 3
Kozyro, A.A.; Krasulin, A.P.; Simirskii, V.V.; Markovnik, V.S.,
Thermodynamic properties of tetramethylurea,
Zhur. Fiz. Khim., 1988, 62, 1747-1751. [all data]
Jamróz, Dobrowolski, et al., 2001
Jamróz, Malgorzata E.; Dobrowolski, Jan Cz.; Polaczek, Jerzy; Szafranski, Andrzej M.; Kazimirski, Jan K.; Lisicki, Zygmunt,
(Solid + liquid) equilibria, i.r., and semi-empirical studies of carbazole with selected tertiary amides,
The Journal of Chemical Thermodynamics, 2001, 33, 5, 565-579, https://doi.org/10.1006/jcht.2000.0770
. [all data]
Kabo, Kozyro, et al., 1995, 2
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]
Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D.,
Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III,
J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Phase change data, References
- Symbols used in this document:
Tboil Boiling point Tfus Fusion (melting) point Ttriple Triple point temperature ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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