Lewisite

Lewisite (L) (A-243) is an organoarsenic compound. It was once manufactured in the U.S., Japan, Germany and the Soviet Union for use as a chemical weapon, acting as a vesicant (blister agent) and lung irritant. Although the substance is colorless and odorless in its pure form, impure samples of lewisite are a yellow, brown, violet-black, green, or amber oily liquid with a distinctive odor that has been described as similar to geraniums.

Lewisite
Names
Preferred IUPAC name
[(E)-2-Chloroethen-1-yl]arsonous dichloride
Other names
Chlorovinylarsine dichloride
2-Chloroethenyldichloroarsine
(E)-2-Chlorovinylarsonous dichloride
(E)-2-Chlorovinyldichloroarsine
Dichloro((E)-2-chlorovinyl)arsine
Identifiers
3D model (JSmol)
ChemSpider
MeSH lewisite
UNII
UN number 2810
  • InChI=1S/C2H2AsCl3/c4-2-1-3(5)6/h1-2H/b2-1+ Y
    Key: GIKLTQKNOXNBNY-OWOJBTEDSA-N Y
  • InChI=1/C2H2AsCl3/c4-2-1-3(5)6/h1-2H/b2-1+
    Key: GIKLTQKNOXNBNY-OWOJBTEDBF
  • Cl[As](Cl)\C=C\Cl
Properties
C2H2AsCl3
Molar mass 207.32 g/mol
Density 1.89 g/cm3
Melting point −18 °C (0 °F; 255 K)
Boiling point 190 °C (374 °F; 463 K)
Reacts with water
Solubility Ethers, hydrocarbons, THF
Vapor pressure 0.58 mmHg (25 °C)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Flammable, highly toxic, corrosive, vesicant
NFPA 704 (fire diamond)
4
1
1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references

Apart from its use as a weapon of war, lewisite is useless; a chemist from the United States Army's chemical warfare laboratories said that "no one has ever found any use for the compound".

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