Cyanide
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In chemistry, cyanide (from Greek kyanos 'dark blue') is an inorganic chemical compound that contains a C≡N functional group. This group, known as the cyano group, consists of a carbon atom triple-bonded to a nitrogen atom.
Ionic cyanides contain the cyanide anion −C≡N. This anion is extremely poisonous. Soluble cyanide salts such as sodium cyanide (NaCN), potassium cyanide (KCN) and tetraethylammonium cyanide ([(CH3CH2)4N]CN) are highly toxic.
Covalent cyanides contain the −C≡N group, and are usually called nitriles if the group is linked by a single covalent bond to carbon atom. For example, in acetonitrile CH3−C≡N, the cyanide group is bonded to methyl −CH3. In tetracyanomethane C(−C≡N)4, four cyano groups are bonded to carbon. Although nitriles generally do not release cyanide ions, the cyanohydrins do and are thus toxic. The cyano group may be covalently bonded to atoms different than carbon, e.g., in cyanogen azide N3−C≡N, phosphorus tricyanide P(−C≡N)3 and trimethylsilyl cyanide (CH3)3Si−C≡N.
Hydrogen cyanide, or H−C≡N, is a highly volatile toxic liquid that is produced on a large scale industrially. It is obtained by acidification of cyanide salts.
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