Global InformationUnsymmetrical dimethylhydrazine information
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| Names | |||
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| Preferred IUPAC name
1,1-Dimethylhydrazine[1] | |||
| Other names
Dimazine
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| Identifiers | |||
CAS Number
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3D model (JSmol)
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Beilstein Reference
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605261 | ||
| ChEBI |
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| ChemSpider |
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| ECHA InfoCard | 100.000.287 | ||
| EC Number |
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| KEGG |
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| MeSH | dimazine | ||
PubChem CID
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| RTECS number |
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| UNII |
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| UN number | 1163 | ||
CompTox Dashboard (EPA)
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InChI
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SMILES
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| Properties | |||
Chemical formula
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H2NN(CH3)2 | ||
| Appearance | Colorless liquid | ||
| Odor | Ammoniacal, fishy | ||
| Density | 791 kg m−3 (at 22 °C) | ||
| Melting point | −57 °C; −71 °F; 216 K | ||
| Boiling point | 64.0 °C; 147.1 °F; 337.1 K | ||
Solubility in water
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Miscible[2] | ||
| Vapor pressure | 13.7 kPa (at 20 °C) | ||
Refractive index (nD)
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1.4075 | ||
| Thermochemistry | |||
Heat capacity (C)
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164.05 J K−1 mol−1 | ||
Std molar
entropy (S⦵298) |
200.25 J K−1 mol−1 | ||
Std enthalpy of
formation (ΔfH⦵298) |
48.3 kJ mol−1 | ||
Std enthalpy of
combustion (ΔcH⦵298) |
−1982.3 – −1975.1 kJ mol−1 | ||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards
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Carcinogen, spontaneously ignites on contact with oxidizers | ||
| GHS labelling: | |||
Pictograms
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Signal word
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Danger | ||
Hazard statements
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H225, H301, H314, H331, H350, H411 | ||
Precautionary statements
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P210, P261, P273, P280, P301+P310 | ||
| NFPA 704 (fire diamond) | 
4
3
1 | ||
| Flash point | −10 °C (14 °F; 263 K) | ||
Autoignition
temperature |
248 °C (478 °F; 521 K) | ||
| Explosive limits | 2–95% | ||
| Lethal dose or concentration (LD, LC): | |||
LD50 (median dose)
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LC50 (median concentration)
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| NIOSH (US health exposure limits): | |||
PEL (Permissible)
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TWA 0.5 ppm (1 mg/m3) [skin][2] | ||
REL (Recommended)
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Ca C 0.06 ppm (0.15 mg/m3) [2 hr][2] | ||
IDLH (Immediate danger)
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Ca [15 ppm][2] | ||
| Related compounds | |||
Related compounds
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 verify (what is   ?)
Infobox references
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Unsymmetrical dimethylhydrazine (UDMH; 1,1-dimethylhydrazine, heptyl or codenamed Geptil) is a chemical compound with the formula H2NN(CH3)2 that is used as a rocket propellant.[4] It is a colorless liquid, with a sharp, fishy, ammonia-like smell typical for organic amines. Samples turn yellowish on exposure to air and absorb oxygen and carbon dioxide. It is miscible with water, ethanol, and kerosene. In concentration between 2.5% and 95% in air, its vapors are flammable. It is not sensitive to shock. Symmetrical dimethylhydrazine (1,2-dimethylhydrazine) is also known but is not as useful.[5] UDMH can be oxidized in air to form many different substances, including toxic ones.[6][7][8]
- ^ "dimazine – Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 26 March 2005. Identification. Retrieved 21 February 2012.
- ^ a b c d NIOSH Pocket Guide to Chemical Hazards. "#0227". National Institute for Occupational Safety and Health (NIOSH).
- ^ "1,1-Dimethylhydrazine". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
- ^ Semenkov, Ivan; Koroleva, Tatyana (1 December 2022). "Review on the environmental impact of emissions from space launches: a case study for areas affected by the Russian space programme". Environmental Science and Pollution Research. 29 (60): 89807–89822. Bibcode:2022ESPR...2989807S. doi:10.1007/s11356-022-23888-8. ISSN 1614-7499. PMID 36346528. S2CID 253396676.
- ^ Cite error: The named reference
Ullmannwas invoked but never defined (see the help page). - ^ Aleksey Milyushkin, Anastasia Karnaeva (2023). "Unsymmetrical dimethylhydrazine transformation products: A review". Science of the Total Environment. 891: 164367. Bibcode:2023ScTEn.891p4367M. doi:10.1016/j.scitotenv.2023.164367. PMID 37236454. S2CID 258899003.
- ^ Ul'yanovskii, Nikolay V.; Lakhmanov, Dmitry E.; Pikovskoi, Ilya I.; Falev, Danil I.; Popov, Mark S.; Kozhevnikov, Alexander Yu.; Kosyakov, Dmitry S. (15 July 2020). "Migration and transformation of 1,1-dimethylhydrazine in peat bog soil of rocket stage fall site in Russian North". Science of the Total Environment. 726: 138483. Bibcode:2020ScTEn.726m8483U. doi:10.1016/j.scitotenv.2020.138483. ISSN 0048-9697. PMID 32315849. S2CID 216073493.
- ^ Koroleva, T. V.; Semenkov, I. N.; Lednev, S. A.; Soldatova, O. S. (1 February 2023). "Unsymmetrical Dimethylhydrazine (UDMH) and Its Transformation Products in Soils: A Review of the Sources, Detection, Behavior, Toxicity, and Remediation of Polluted Territories". Eurasian Soil Science. 56 (2): 210–225. Bibcode:2023EurSS..56..210K. doi:10.1134/S1064229322602001. ISSN 1556-195X. S2CID 257903133.