|Molar mass||173.83 g·mol−1|
|Density||2.477 g mL−1|
|Melting point||−52.70 °C; −62.86 °F; 220.45 K|
|Boiling point||96 °C; 205 °F; 369 K|
|12.5 g L−1 (at 20 °C)|
|Vapor pressure||4.65 kPa (at 20.0 °C)|
|9.3 μmol Pa−1 kg−1|
Refractive index (nD)
|104.1 J K−1 mol−1|
|GHS signal word||WARNING|
LD50 (Median lethal dose)
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Dibromomethane or methylene bromide, or methylene dibromide is a halomethane. It is slightly soluble in water but very soluble in carbon tetrachloride, diethyl ether and methanol. Its refractive index is 1.5419 (20 °C, D).
Dibromomethane can be prepared from bromoform by reaction
- CHBr3 + Na3AsO3 + NaOH → CH2Br2 + Na3AsO4 + NaBr
It is naturally produced by marine algae and liberated to the oceans. Releasing on soil causes it to evaporate and leach into the ground. Releasing in water causes it to be lost mainly by volatilisation with a half life of 5.2 hours. It has no significant degradating biological or abiological effects. In the atmosphere it will be lost because of reaction with photochemically produced hydroxyl radicals. The estimated half life of this reaction is 213 days.
- Podsiadlo M., Dziubek K., Szafranski M., Katrusiak A. (December 2006). "Molecular interactions in crystalline dibromomethane and diiodomethane, and the stabilities of their high-pressure and low-temperature phases". Acta Cryst. B62 (6): 1090–1098(9). doi:10.1107/S0108768106034963. PMID 17108664. Retrieved 2007-06-29.
- "methylene bromide - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 25 March 2005. Identification. Retrieved 18 June 2012.
- Methylene bromide preparation