Dimethylamine
- Formula: C2H7N
- Molecular weight: 45.0837
- IUPAC Standard InChIKey: ROSDSFDQCJNGOL-UHFFFAOYSA-N
- CAS Registry Number: 124-40-3
- 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: Methanamine, N-methyl-; (CH3)2NH; N-Methylmethanamine; Rcra waste number U092; UN 1032; N,N-Dimethylamine; NSC 8650
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Phase change data
Go To: Top, 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
DRB - Donald R. Burgess, Jr.
DH - Eugene S. Domalski and Elizabeth D. Hearing
AC - William E. Acree, Jr., James S. Chickos
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 281. ± 1. | K | AVG | N/A | Average of 7 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 180.15 | K | N/A | Roberts, Emeleus, et al., 1939 | Uncertainty assigned by TRC = 0.4 K; not clear whether this was measured or not; TRC |
Tfus | 178.9 | K | N/A | Simon and Huter, 1935 | Uncertainty assigned by TRC = 0.5 K; TRC |
Tfus | 180.15 | K | N/A | Simon and Huter, 1935, 2 | Uncertainty assigned by TRC = 1.5 K; TRC |
Tfus | 180.25 | K | N/A | Wiberg and Sutterlin, 1935 | Uncertainty assigned by TRC = 1. K; TRC |
Tfus | 177.15 | K | N/A | Timmermans and Mattaar, 1921 | Uncertainty assigned by TRC = 0.5 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 180.97 | K | N/A | Aston, Eidinoff, et al., 1939 | Uncertainty assigned by TRC = 0.02 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 437.22 | K | N/A | Kay and Young, 1974 | Uncertainty assigned by TRC = 0.15 K; TRC |
Tc | 437.7 | K | N/A | Berthoud, 1917 | Uncertainty assigned by TRC = 0.3 K; TRC |
Tc | 437.75 | K | N/A | Berthoud, 1917 | Uncertainty assigned by TRC = 0.3 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 53.40 | bar | N/A | Kay and Young, 1974 | Uncertainty assigned by TRC = 0.03 bar; TRC |
Pc | 53.0436 | bar | N/A | Berthoud, 1917 | Uncertainty assigned by TRC = 0.3039 bar; TRC |
Pc | 53.1247 | bar | N/A | Berthoud, 1917 | Uncertainty assigned by TRC = 0.4053 bar; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 25.44 | kJ/mol | N/A | Majer and Svoboda, 1985 | |
ΔvapH° | 25.4 ± 0.04 | kJ/mol | V | Issoire and Long, 1960 | Heat of formation derived by Cox and Pilcher, 1970; ALS |
ΔvapH° | 26.0 | kJ/mol | N/A | Issoire and Long, 1960 | DRB |
ΔvapH° | 26.5 ± 0.1 | kJ/mol | V | Aston, Eidinoff, et al., 1939, 2 | ALS |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
26.485 | 280.03 | N/A | Aston, Eidinoff, et al., 1939, 3 | P = 101.325 kPa; DH |
26.4 | 280. | N/A | Majer and Svoboda, 1985 | |
27.0 | 292. | A | Stephenson and Malanowski, 1987 | Based on data from 277. to 360. K.; AC |
23.8 | 373. | A | Stephenson and Malanowski, 1987 | Based on data from 358. to 438. K.; AC |
28.4 | 264. | A | Stephenson and Malanowski, 1987 | Based on data from 202. to 279. K. See also Aston, Eidinoff, et al., 1939, 3 and Boublik, Fried, et al., 1984.; AC |
Entropy of vaporization
ΔvapS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
94.58 | 280.03 | Aston, Eidinoff, et al., 1939, 3 | P; DH |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
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Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
201.38 to 280.01 | 4.29371 | 995.445 | -47.869 | Aston, Eidinoff, et al., 1939, 3 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
5.941 | 180.97 | Aston, Eidinoff, et al., 1939, 3 | DH |
5.94 | 181. | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
32.83 | 180.97 | Aston, Eidinoff, et al., 1939, 3 | 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.
Roberts, Emeleus, et al., 1939
Roberts, E.R.; Emeleus, H.J.; Briscoe, H.V.A.,
Preparation and Prop. of Ethyldideuteramine and Dimethyldeuteramine,
J. Chem. Soc., 1939, 1939, 41. [all data]
Simon and Huter, 1935
Simon, A.; Huter, J.,
Vapor Pressure Curves, Melting Point and Chemical Constants of Dimethyl, Trimethyl- and Isobutylamines,
Z. Elektrochem., 1935, 41, 28. [all data]
Simon and Huter, 1935, 2
Simon, A.; Huter, J.,
Z. Elektrochem., 1935, 41, 294. [all data]
Wiberg and Sutterlin, 1935
Wiberg, E.; Sutterlin, W.,
The Vapor Pressures and Melting Points of Dimethyl- and Trimethylamine Trimethylamines,
Z. Elektrochem., 1935, 41, 151. [all data]
Timmermans and Mattaar, 1921
Timmermans, J.; Mattaar, J.F.,
Freezing points of orgainic substances VI. New experimental determinations.,
Bull. Soc. Chim. Belg., 1921, 30, 213. [all data]
Aston, Eidinoff, et al., 1939
Aston, J.G.; Eidinoff, M.L.; Forster, W.S.,
The Heat Capacity and Entropy, Heats of Fusion and Vaporization and the Vapor Pressure of Dimethylamine.,
J. Am. Chem. Soc., 1939, 61, 1539. [all data]
Kay and Young, 1974
Kay, W.B.; Young, C.L.,
Int. DATA Ser., Sel. Data Mixtures, Ser. A, 1974, No. 2, 156. [all data]
Berthoud, 1917
Berthoud, A.,
Determination of Critical Temperatures and Pressures of Amines and Alkyl Chlorides,
J. Chim. Phys. Phys.-Chim. Biol., 1917, 15, 3. [all data]
Majer and Svoboda, 1985
Majer, V.; Svoboda, V.,
Enthalpies of Vaporization of Organic Compounds: A Critical Review and Data Compilation, Blackwell Scientific Publications, Oxford, 1985, 300. [all data]
Issoire and Long, 1960
Issoire, J.; Long, C.,
Etude de la thermodynamique chimique de la reaction de formation des methylamines,
Bull. Soc. Chim. France, 1960, 2004-2012. [all data]
Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G.,
Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]
Aston, Eidinoff, et al., 1939, 2
Aston, J.G.; Eidinoff, M.L.; Forster, W.S.,
The heat capacity and entropy, heats of fusion and vaporization and the vapor pressure of dimethylamine,
J. Am. Chem. Soc., 1939, 61, 1539-15. [all data]
Aston, Eidinoff, et al., 1939, 3
Aston, J.G.; Eidinoff, M.L.; Forster, W.S.,
The heat capacity and entropy, heats of fusion and vaporization and the vapor pressure of dimethylamine,
J. Am. Chem. Soc., 1939, 61, 1539-1543. [all data]
Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw,
Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2
. [all data]
Boublik, Fried, et al., 1984
Boublik, T.; Fried, V.; Hala, E.,
The Vapour Pressures of Pure Substances: Selected Values of the Temperature Dependence of the Vapour Pressures of Some Pure Substances in the Normal and Low Pressure Region, 2nd ed., Elsevier, New York, 1984, 972. [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, Phase change data, References
- Symbols used in this document:
Pc Critical pressure Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point Ttriple Triple point temperature ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization at standard conditions ΔvapS Entropy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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