iodomethane

CAS No. 74-88-4

Formula: CH3I
Basic Info

Methyl iodide, also called iodomethane, and commonly abbreviated "MeI", is the chemical compound with the formula CH3I. It is a dense, colorless, volatile liquid. In terms of chemical structure, it is related to methane by replacement of one hydrogen atom by an atom of iodine. It is naturally emitted by rice plantations in small amounts. It is also produced in vast quantities estimated to be greater than 214,000 tons annually by algae and kelp in the world's temperate oceans, and in lesser amounts on land by terrestrial fungi and bacteria. It is used in organic synthesis as a source of methyl groups.
Methyl iodide had been approved for use as a pesticide by the United States Environmental Protection Agency in 2007 as a pre-plant biocide used to control insects, plant parasitic nematodes, soil borne pathogens, and weed seeds. The compound was registered for use as a preplant soil treatment for field grown strawberries, peppers, tomatoes, grape vines, ornamentals and turf and nursery grown strawberries, stone fruits, tree nuts, and conifer trees. After the discovery phase in a consumer lawsuit, the manufacturer withdrew the fumigant citing its lack of market viability.

Formula
CH3I
Molecular Weight
141.939
Exact Mass
141.928
LogP
1.0512
PSA
0
Synonyms

methyl iodide

iodo-methan

methyl iodine

methane iodide

Methane, iodo-

Iodomethane

10domethane

Jodmethan

Iodometano

CH3I

iodo-methane

Iodmethan

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Properties
Appearance & Physical State
Clear to pink liquid
Density
2.279
Boiling Point
41-43ºC
Melting Point
-64ºC
Flash Point
-28ºC
Refractive Index
1.531
Water Solubility
14 g/L (20 ºC)
Storage Condition
Store at 0ºC
Vapor Density
4.89 (vs air)
Vapor Pressure
24.09 psi ( 55 °C)
Safety Info
RTECS
PA9450000
Safety Statements
S16-S24-S36/37-S38-S45-S9
WGK Germany
1
Risk Statements
R11; R21; R23/25; R37/38; R40
HS Code
2903399030
RIDADR
UN 2644
Hazard Class
6.1
Packing Group
I
Caution Statement
P261; P280; P301 + P310; P311
Hazard Codes
Spectrum
NMR Spectrum 1H NMR : parameter in CDCl3
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IR Spectrum IR : liquid film
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ESR Spectrum ESR : METHYL RADICAL, X-IRRAD.(53%13C), 77K
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Analysis Methods
Kovats' RI, non-polar column, isothermal
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Column Shape
Packed
Active Phase(℃)
OV-1
Retention index
523.
Temperature Control
100.
Method
isothermal
Comments
He, Chromosorb W DMCS; Column length: 3. m
Reference
Castello, G.Gerbino, T.C.Effect of Temperature on the Gas Chromatographic Separation of Halogenated Compounds on Polar and Non-Polar Stationary PhasesJ. Chromatogr.1988, 437, 33-45.
Kovats' RI, non-polar column, isothermal
expand collapse
Column Shape
Packed
Active Phase(℃)
OV-1
Retention index
528.
Temperature Control
125.
Method
isothermal
Comments
He, Chromosorb W DMCS; Column length: 3. m
Reference
Castello, G.Gerbino, T.C.Effect of Temperature on the Gas Chromatographic Separation of Halogenated Compounds on Polar and Non-Polar Stationary PhasesJ. Chromatogr.1988, 437, 33-45.
Kovats' RI, non-polar column, isothermal
expand collapse
Column Shape
Packed
Active Phase(℃)
OV-1
Retention index
518.
Temperature Control
75.
Method
isothermal
Comments
He, Chromosorb W DMCS; Column length: 3. m
Reference
Castello, G.Gerbino, T.C.Effect of Temperature on the Gas Chromatographic Separation of Halogenated Compounds on Polar and Non-Polar Stationary PhasesJ. Chromatogr.1988, 437, 33-45.
Kovats' RI, non-polar column, isothermal
expand collapse
Column Shape
Packed
Active Phase(℃)
Apolane
Retention index
528.6
Temperature Control
70.
Method
isothermal
Comments
He, Chromosorb; Column length: 2.4 m
Reference
Riedo, F.Fritz, D.Tarján, G.Kováts, E.Sz.A tailor-made C87 hydrocarbon as a possible non-polar standard stationary phase for gas chromatographyJ. Chromatogr.1976, 126, 63-83.
Kovats' RI, non-polar column, isothermal
expand collapse
Column Shape
Packed
Active Phase(℃)
Squalane
Retention index
502.
Temperature Control
27.
Method
isothermal
Comments
He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm
Reference
Hively, R.A.Hinton, R.E.Variation of the retention index with temperature on squalane substratesJ. Gas Chromatogr.1968, 6, 4, 203-217.
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