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Any of various compounds, especially an aromatic hydrocarbon, containing the cation N2 attached to an organic group.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Chemistry) (modifier) of, consisting of, or containing the group, Ar-N:N-, where Ar is an aryl group: diazonium group or radical; a diazonium compound.
2. (Elements & Compounds) (modifier) of, consisting of, or containing the group, Ar-N:N-, where Ar is an aryl group: diazonium group or radical; a diazonium compound.
[C19: diazo + (amm)onium]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌdaɪ əˈzoʊ ni əm)
any of a series of chemical compounds containing the group RN2-, in which R represents an aromatic hydrocarbon.
[1890–95; diaz (o) + -onium,]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.diazonium - the univalent cation R-N:N- (where R is an aromatic hydrocarbon); found in salts that are used in manufacturing azo dyes
cation - a positively charged ion
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References in periodicals archive ?
They found that the electrochemical reduction of [NO2PhEImMFc][TFSI] in acidic media containing sodium nitrite could lead to the in situ formation of the corresponding diazonium, in the vicinity of the electrode, and subsequently the grafting of redox based IL onto the electrode surface.
After 40 min of continuous stirring, the suspension of diazonium salt was added with cold solution of N,N-bis(2-hydroxyethyl)aniline (0.80 g, 4.4 mmol), which was previously dissolved in absolute alcohol, followed by the addition of anhydrous sodium acetate (3 g).
The main aim of this method is measurement of wave length of azo-dye which is formed by the reaction of 1-naphthylamine with diazonium salt, formed by the reaction of sulphanilic acid with nitrous acid (Figure 2A) [43].
Spectrophotometric determination of uric acid in urine based-enzymatic method uricase with 4-Aminodiphenylamine diazonium sulfate (Variamine Blue RT Salt).
Fragoso and O'Sullivan also reported a markedly more robust attachment based on reduction of individual diazonium moieties and showed it to be significantly more stable than even dithiol attachment [25].
The diazonium solution of 4 previously prepared was added dropwise over 1 hour, and then 15 mL of sodium acetate solution (10%) was added to the mixture.
Henderson, "A systematic study of carbon fibre surface grafting via in situ diazonium generation for improved interfacial shear strength in epoxy matrix composites," Composites Science and Technology, vol.
It enters directly into epithelial cells of the colon from blood circulation, where MAMA produces reactive oxygen species and methyl diazonium ions, responsible for the methylation of DNA and modification of nucleic acids and histones.
This study reports a simple FI spectrophotometric method for the determination of ANTU in natural waters, based on the conversion of nitrite into nitrous acid, subsequent diazotization of sulphanilic acid, and formation of the diazonium salt.
Electrochemical transformations of [Fe.sub.3][O.sub.4] nanoparticles, carbon-coated nanoparticles, and iron nanoparticles coated with a layer of carbon and diazonium salts from the surface of the CPE under its cathodic and anodic polarization have been studied.
Then, the mixture was cooled at a temperature from zero to -4[degrees]C, sodium nitrite (0.28 g, 4 mmol) in 2 mL of water was added portionwise at a temperature of -4[degrees]C to form the corresponding diazonium salt 2, and the diazonium salt formed was added to a mixture of 4-(substituted imino)pentan-2-one derivatives 3 (2 mmol) [27] in ethanol (15 mL) slowly under the same temperature allowing the mixture to stir at room temperature for an additional 3 hours.