CS gas

The compound 2-chlorobenzalmalononitrile (also called o-chlorobenzylidene malononitrile; chemical formula: C10H5ClN2), a cyanocarbon, is the defining component of tear gas commonly referred to as CS gas, which is used as a riot control agent.

CS gas
Names
Preferred IUPAC name
[(2-Chlorophenyl)methylidene]propanedinitrile
Other names
2-(2-Chlorobenzylidene)malononitrile
2-Chlorobenzalmalononitrile
o-Chlorobenzylidene malononitrile
Tear gas
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.018.435
EC Number
  • 220-278-9
RTECS number
  • OO3675000
UNII
UN number 2810, 3276, 2811
  • InChI=1S/C10H5ClN2/c11-10-4-2-1-3-9(10)5-8(6-12)7-13/h1-5H Y
    Key: JJNZXLAFIPKXIG-UHFFFAOYSA-N Y
  • InChI=1/C10H5ClN2/c11-10-4-2-1-3-9(10)5-8(6-12)7-13/h1-5H
    Key: JJNZXLAFIPKXIG-UHFFFAOYAA
  • Clc1ccccc1\C=C(/C#N)C#N
Properties
C10H5ClN2
Molar mass 188.6 g/mol
Appearance White crystalline powder
Colourless gas when burned
Odor Pepper-like
Density 1.04 g/cm3
Melting point 93 °C (199 °F; 366 K)
Boiling point 310 °C (590 °F; 583 K)
Insoluble
Vapor pressure 3.4×10−5 mmHg at 20 °C
Hazards
GHS labelling:
Danger
H302, H314, H330, H335, H372, H410
P260, P261, P264, P270, P271, P273, P280, P284, P301+P312, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P314, P320, P321, P330, P363, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
2
1
0
Lethal dose or concentration (LD, LC):
  • 1806 mg/m3 (rat, 45 min)
  • 2753 mg/m3 (mouse, 20 min)
  • 1802 mg/m3 (rabbit, 10 min)
  • 2326 mg/m3 (guinea pig, 10 min)
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 0.05 ppm (0.4 mg/m3)
REL (Recommended)
 C 0.05 ppm (0.4 mg/m3) [skin]
IDLH (Immediate danger)
 2 mg/m3
Related compounds
Related compounds
 SDBS

5-chloro-2-quinolinecarbonitrile
6-chloro-2-quinolinecarbonitrile
7-chloro-2-quinolinecarbonitrile

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
This article is about the tear gas. For the compound with the molecular formula CS, see Carbon monosulfide.

Exposure causes a burning sensation and tearing of the eyes to the extent that the subject cannot keep their eyes open, and a burning irritation of the mucous membranes of the nose, mouth and throat, resulting in profuse coughing, nasal mucus discharge, disorientation, and difficulty breathing, partially incapacitating the subject. CS gas is an aerosol of a volatile solvent (a substance that dissolves other active substances and that easily evaporates) and 2-chlorobenzalmalononitrile, which is a solid compound at room temperature. CS gas is generally accepted as being non-lethal. It was first synthesized by two Americans, Ben Corson and Roger Stoughton, at Middlebury College in 1928, and the chemical's name is derived from the first letters of the scientists' surnames.

CS was developed and tested secretly at Porton Down in Wiltshire, UK, in the 1950s and '60s. CS was used first on animals, then subsequently on British Army servicemen volunteers. CS has less effect on animals because they have different tear ducts and, in the case of non-human mammals, their fur inhibits the free entry of the gas.

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