Methylamine
Methylamine is an organic compound with a formula of CH3NH2. This colorless gas is a derivative of ammonia, but with one hydrogen atom being replaced by a methyl group. It is the simplest primary amine.
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| Names | |||
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| Pronunciation | /ˌmɛθələˈmiːn/ (METH-ə-lə-MEEN), /ˌmɛθəˈlæmən/ (METH-ə-LA-mən), /məˈθɪləˌmiːn/ (mə-THIL-ə-meen) | ||
| Preferred IUPAC name
Methanamine | |||
Other names
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| Identifiers | |||
3D model (JSmol) |
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| 3DMet | |||
| Abbreviations | MMA | ||
| 741851 | |||
| ChEBI | |||
| ChEMBL | |||
| ChemSpider | |||
| DrugBank | |||
| ECHA InfoCard | 100.000.746 | ||
| EC Number |
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| 145 | |||
| KEGG | |||
| MeSH | methylamine | ||
PubChem CID |
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| RTECS number |
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| UNII | |||
| UN number | 1061 | ||
CompTox Dashboard (EPA) |
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| Properties | |||
| CH3NH2 | |||
| Molar mass | 31.058 g·mol−1 | ||
| Appearance | Colorless gas | ||
| Odor | Fishy, ammoniacal | ||
| Density | 0.6562 g/cm3 (at 25 °C) | ||
| Melting point | −93.10 °C; −135.58 °F; 180.05 K | ||
| Boiling point | −6.6 to −6.0 °C; 20.0 to 21.1 °F; 266.5 to 267.1 K | ||
| 1008 g/L (at 20 °C) | |||
| log P | −0.472 | ||
| Vapor pressure | 186.10 kPa (at 20 °C) | ||
Henry's law constant (kH) |
1.4 mmol/(Pa·kg) | ||
| Acidity (pKa) | 10.66 | ||
| Conjugate acid | [CH3NH3]+ (Methylammonium) | ||
| -27.0·10−6 cm3/mol | |||
| Viscosity | 230 μPa·s (at 0 °C) | ||
| 1.31 D | |||
| Thermochemistry | |||
Std enthalpy of formation (ΔfH⦵298) |
−23.5 kJ/mol | ||
| Hazards | |||
| GHS labelling: | |||
| Danger | |||
| H220, H315, H318, H332, H335 | |||
| P210, P261, P280, P305+P351+P338, P410+P403 | |||
| NFPA 704 (fire diamond) | |||
| Flash point | −10 °C; 14 °F; 263 K (liquid, gas is extremely flammable) | ||
| 430 °C (806 °F; 703 K) | |||
| Explosive limits | 4.9–20.7% | ||
| Lethal dose or concentration (LD, LC): | |||
LD50 (median dose) |
100 mg/kg (oral, rat) | ||
LC50 (median concentration) |
1860 ppm (mouse, 2 hr) | ||
| NIOSH (US health exposure limits): | |||
PEL (Permissible) |
TWA 10 ppm (12 mg/m3) | ||
REL (Recommended) |
TWA 10 ppm (12 mg/m3) | ||
IDLH (Immediate danger) |
100 ppm | ||
| Safety data sheet (SDS) | emdchemicals.com | ||
| Related compounds | |||
Related alkanamines |
ethylamine, dimethylamine, trimethylamine | ||
Related compounds |
ammonia | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |||
Methylamine is sold as a solution in methanol, ethanol, tetrahydrofuran, or water, or as the anhydrous gas in pressurized metal containers. Industrially, methylamine is transported in its anhydrous form in pressurized railcars and tank trailers. It has a strong odor similar to rotten fish. Methylamine is used as a building block for the synthesis of numerous other commercially available compounds.
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