Diazoniun salts
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Diazoniun Salts. Physical Properties. colourless crystalline solid. soluble in water and is stable in cold but reacts with water when warmed. It decomposes easily in the dry state. . Chemical Reactions. Reactions involving displacement of nitrogen. Replacement by halide or cyanide ion.

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Diazoniun salts

Diazoniun Salts


Physical properties
Physical Properties

  • colourless crystalline solid.

  • soluble in water and is stable in cold but reacts with water when warmed.

  • It decomposes easily in the dry state.


Chemical reactions

Chemical Reactions

Reactions involving displacement of nitrogen


Replacement by halide or cyanide ion
Replacement by halide or cyanide ion

  • This reaction is called Sandmeyer reaction.


Gatterman reaction
Gatterman reaction.


Replacement by iodide ion
Replacement by iodide ion:

  • when the diazonium salt solution is treated with potassium iodide, iodobenzene is formed.


Replacement by fluoride ion
Replacement by fluoride ion:

  • When arenediazonium chloride is treated with fluoroboric acid, arenediazoniumfluoroborateis precipitated which on heating decomposes to yield aryl fluoride.


Replacement by h
Replacement by H:

  • Certain mild reducing agents like hypophosphorousacid (phosphinic acid) or ethanol reduce diazoniumsalts to arenes and themselves get oxidisedto phosphorous acid and ethanal, respectively.


Replacement by hydroxyl group
Replacement by hydroxyl group:

  • 283 K, the salt gets hydrolysed to phenol.



Reactions involving retention of diazo group

Reactions involving retention of diazo group

Coupling reactions


Coupling reactions
coupling reactions

  • These compounds are often coloured and are used as dyes. These compounds are often coloured and are used as dyes.