1. a positively charged organic ion containing two bonded nitrogen atoms, formed by the reaction of a primary aromatic amine with nitrous acid; used in organic synthesis and dye production.
Usage: chemistry; technical

Examples

• The diazonium salt was prepared by treating aniline with nitrous acid.
• Diazonium compounds are important intermediates in the synthesis of azo dyes.
• The stability of the diazonium ion depends on the temperature and pH of the solution.
• Chemists use diazonium reactions to introduce various functional groups into aromatic rings.
• The diazonium group can be replaced by a halogen through the Sandmeyer reaction.