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Qu'est-ce (qui) est cyanide$18343$ - définition
.jpg?width=200 "Figure 1: The structure of HT-CuCN showing the chains running along the c axis. Key: copper = orange and cyan = head-to-tail disordered cyanide groups.")
.jpg?width=200 "Figure 2: The structure of LT-CuCN showing sheets of chains stacking in an ABAB fashion. Key: copper = orange and cyan = head-to-tail disordered cyanide groups.")
![Removal of cyanide from [[cassava]] in [[Nigeria]].](https://commons.wikimedia.org/wiki/Special:FilePath/Removal of cyanide poison from cassava.jpg?width=200 "Removal of cyanide from [[cassava]] in [[Nigeria]].")
In chemistry, a cyanide (from Greek kyanos 'dark blue') is a 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.
In inorganic cyanides, the cyanide group is present as the anion −C≡N. Soluble salts such as sodium cyanide (NaCN) and potassium cyanide (KCN) are highly toxic. Hydrocyanic acid, also known as hydrogen cyanide, or HCN, is a highly volatile liquid that is produced on a large scale industrially. It is obtained by acidification of cyanide salts.
Organic cyanides are usually called nitriles. In nitriles, the C≡N group is linked by a covalent bond to carbon. For example, in acetonitrile (CH3−C≡N), the cyanide group is bonded to methyl (−CH3). Although nitriles generally do not release cyanide ions, the cyanohydrins do and are thus rather toxic.
Wikipédia
Copper(I) cyanide is an inorganic compound with the formula CuCN. This off-white solid occurs in two polymorphs; impure samples can be green due to the presence of Cu(II) impurities. The compound is useful as a catalyst, in electroplating copper, and as a reagent in the preparation of nitriles.
