diazonium salt

noun

Chemistry.

1. any of a group of salts of the general formula ArN 2 X, in which Ar represents an aryl group and X an anion, as benzenediazonium chloride, C 6 H 5 N(N)Cl, many of which are important intermediates in the manufacture of azo dyes.

diazonium salt

noun

1. any of a class of compounds with the general formula ArN:N ^– M ⁺ , where Ar is an aryl group and M is a metal atom; made by the action of nitrous acid on aromatic amines and used in dyeing

Word History and Origins

Origin of diazonium salt¹

First recorded in 1905–10

Example Sentences

These iso-diazotates are formed much more readily when the aromatic nucleus in the diazonium salt contains negative radicals.

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In this process the amine salt is dissolved in absolute alcohol and diazotized by the addition of amyl nitrite; a crystalline precipitate of the diazonium salt is formed on standing, or on the addition of a small quantity of ether.

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Replacement of -NH2 by -OH:—The amine is diazotized and the aqueous solution of the diazonium salt is heated, nitrogen being eliminated and a phenol formed.

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Oxyazo Compounds.—The oxyazo compounds are prepared by adding a solution of a diazonium salt to a cold slightly alkaline solution of a phenol.

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Zincke found that the products obtained by coupling a diazonium salt with α-naphthol, and by condensing phenyl-hydrazine with α-naphthoquinone, were identical; whilst Meldola acetylated the azophenols, and split the acetyl products by reduction in acid solution, but obtained no satisfactory results.

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