Diiodomethane

Diiodomethane
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IUPAC name	Diiodomethane
Other names	Methylene iodide, Methylene diiodide, Methyl diiodide
Identifiers
CAS number	75-11-6
PubChem	6346
EINECS number	200-841-5
RTECS number	PA8575000
SMILES	C(I)I
InChI	InChI=1/CH2I2/c2-1-3/h1H2
Properties
Molecular formula	CH2I2
Molar mass	267.84 g/mol
Appearance	Light yellow to gold liquid with chloroform-like odour
Density	3.325 g/cm3
Melting point	6 °C (43 °F)
Boiling point	181 °C (358 °F) (decomp.)
Solubility in water	14 g/l at 20 °C
Hazards
EU classification	Harmful (Xn)
NFPA 704	1 3 0
R-phrases	R20/22
S-phrases	S26, S27, S36/37/39
Flash point	113 °C
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Diiodomethane or methylene iodide is liquid halomethane insoluble in water, soluble in ether and alcohol. It has high refractive index of 1.741. Fresh diiodomethane is a colorless liquid. However, its exposition to light causes it to slowly decompose and deliberate iodine, which colours it brownish.

With its high specific gravity, it is used for the separation of minerals or for determination of specific gravity of mineral particles. Due its uncertain toxicity, it should be replaced with safer heavy liquids. It is also used as a solvent and a chemical intermediate.

See also

• Haloalkane
• Halomethane
• Difluoromethane
• Dichloromethane
• Dibromomethane
• Iodomethane
• Iodoform
• Carbon tetraiodide

External links

• MSDS at Oxford University
• MSDS at sciencelab.com
• Diiodomethane data sheet
• New particle formation from photooxidation of diiodomethane
• Preparation from iodoformde:Diiodmethan