Hydrazine, 1,1-dimethyl-
- Formula: C2H8N2
- Molecular weight: 60.0983
- IUPAC Standard InChIKey: RHUYHJGZWVXEHW-UHFFFAOYSA-N
- CAS Registry Number: 57-14-7
- 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: as-Dimethylhydrazine; Dimazin; Dimazine; Hydrazine, N,N-dimethyl-; N,N-Dimethylhydrazine; UDMH; 1,1-Dimethylhydrazine; (CH3)2NNH2; Unsym-dimethylhydrazine; Dimethylhydrazine, unsymmetrical; Dimethylhydrazine, unsym.; 1,1-Dimethylhydrazin; asymmetric Dimethylhydrazine; uns-Dimethylhydrazine; Niesymetryczna dwu metylohydrazyna; Rcra waste number U098; UN 1163; Unsymmetrical dimethylhydrazine; u-Dimethylhydrazine; gem-Dimethylhydrazine; NSC 60517
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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: Donald R. Burgess, Jr.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | 83.3 ± 3.6 | kJ/mol | N/A | Donovan, Shomate, et al., 1960 | Value computed using ΔfHliquid° value of 48.3±3.6 kj/mol from Donovan, Shomate, et al., 1960 and ΔvapH° value of 35±0.2 kj/mol from missing citation. |
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 as indicated in comments:
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 |
---|---|---|---|---|---|
ΔfH°liquid | 48.3 ± 3.6 | kJ/mol | Ccb | Donovan, Shomate, et al., 1960 | Reanalyzed by Cox and Pilcher, 1970, Original value = 49.79 kJ/mol; ALS |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°liquid | -1978.7 ± 3.6 | kJ/mol | Ccb | Donovan, Shomate, et al., 1960 | Reanalyzed by Cox and Pilcher, 1970, Original value = -1980.2 ± 1.8 kJ/mol; ALS |
ΔcH°liquid | -1979.7 ± 2.9 | kJ/mol | Ccb | Aston, Rock, et al., 1952 | Reanalyzed by Cox and Pilcher, 1970, Original value = -1977.6 ± 2.9 kJ/mol; ALS |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid | 200.25 | J/mol*K | N/A | Aston, Wood, et al., 1953 | DH |
Constant pressure heat capacity of liquid
Cp,liquid (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
164.05 | 298.15 | Aston, Wood, et al., 1953 | T = 13 to 300 K.; DH |
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
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing
AC - William E. Acree, Jr., James S. Chickos
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 337.1 | K | N/A | Weast and Grasselli, 1989 | BS |
Tboil | 336.2 | K | N/A | Majer and Svoboda, 1985 | |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 216. | K | N/A | McMillan, 1967 | Uncertainty assigned by TRC = 1.5 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 215.95 | K | N/A | Aston, Wood, et al., 1953, 2 | Uncertainty assigned by TRC = 0.02 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 35.22 | kJ/mol | N/A | Majer and Svoboda, 1985 | |
ΔvapH° | 35.0 ± 0.2 | kJ/mol | V | Aston, Wood, et al., 1953, 3 | ALS |
Reduced pressure boiling point
Tboil (K) | Pressure (bar) | Reference | Comment |
---|---|---|---|
336.2 | 1.00 | Aldrich Chemical Company Inc., 1990 | BS |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
35.003 | 298.15 | N/A | Aston, Wood, et al., 1953 | P = 20.90 kPa; DH |
32.55 | 336.2 | N/A | Majer and Svoboda, 1985 | |
34.1 | 284. | N/A | Bourret-Courchesne, Ye, et al., 2000 | Based on data from 267. to 303. K.; AC |
36.5 | 277. | A | Stephenson and Malanowski, 1987 | Based on data from 238. to 292. K. See also Aston, Wood, et al., 1953 and Boublik, Fried, et al., 1984.; AC |
Entropy of vaporization
ΔvapS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
117.4 | 298.15 | Aston, Wood, et al., 1953 | 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 |
---|---|---|---|---|---|
237.74 to 293.08 | 4.71316 | 1388.51 | -40.613 | Aston, Wood, et al., 1953 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
10.0726 | 215.95 | Aston, Wood, et al., 1953 | DH |
10.07 | 216. | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
46.64 | 215.95 | Aston, Wood, et al., 1953 | DH |
Gas Chromatography
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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: NIST Mass Spectrometry Data Center, William E. Wallace, director
Normal alkane RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | OV-101 | 527. | Zenkevich, 2005 | 25. m/0.20 mm/0.10 μm, N2/He, 6. K/min; Tstart: 50. C; Tend: 250. C |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Donovan, Shomate, et al., 1960
Donovan, T.M.; Shomate, C.H.; McBride, W.R.,
The heat of combustion of tetramethyltetrazene and 1,1-dimethylhydrazine,
J. Phys. Chem., 1960, 64, 281-282. [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, Rock, et al., 1952
Aston, J.G.; Rock, E.J.; Isserow, S.,
The heats of combustion of the methyl substituted hydrazines and some observations on the burning of volatile liquids,
J. Am. Chem. Soc., 1952, 74, 2484-24. [all data]
Aston, Wood, et al., 1953
Aston, J.G.; Wood, J.L.; Zolki, T.P.,
The thermodynamic properties and configuration of unsymmetrical dimethylhydrazine,
J. Am. Chem. Soc., 1953, 75, 6202-6204. [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]
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]
McMillan, 1967
McMillan, J.A.,
Hydrazine-1,1-Dimethylhydrazine Solid-Liquid Phase Diagram,
J. Chem. Eng. Data, 1967, 12, 39. [all data]
Aston, Wood, et al., 1953, 2
Aston, J.G.; Wood, J.L.; Zolki, T.P.,
The Thermodynamic Properties and Configuration of Unsymmetrical Dimethylhydrazine,
J. Am. Chem. Soc., 1953, 75, 6202. [all data]
Aston, Wood, et al., 1953, 3
Aston, J.G.; Wood, J.L.; Zolki, T.P.,
The thermodynamic properties and configuration of unsymmetrical dimethylhydrazine,
J. Am. Chem. Soc., 1953, 75, 6202-62. [all data]
Aldrich Chemical Company Inc., 1990
Aldrich Chemical Company Inc.,
Catalog Handbook of Fine Chemicals, Aldrich Chemical Company, Inc., Milwaukee WI, 1990, 1. [all data]
Bourret-Courchesne, Ye, et al., 2000
Bourret-Courchesne, E.; Ye, Q.; Peters, D.W.; Arnold, J.; Ahmed, M.; Irvine, S.J.C.; Kanjolia, R.; Smith, L.M.; Rushworth, S.A.,
Pyrolysis of dimethylhydrazine and its co-pyrolysis with triethylgallium,
Journal of Crystal Growth, 2000, 217, 1-2, 47-54, https://doi.org/10.1016/S0022-0248(00)00398-5
. [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]
Zenkevich, 2005
Zenkevich, I.G.,
Experimentally measured retention indices., 2005. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas Chromatography, References
- Symbols used in this document:
Cp,liquid Constant pressure heat capacity of liquid S°liquid Entropy of liquid at standard conditions Tboil Boiling point Tfus Fusion (melting) point Ttriple Triple point temperature ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions 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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