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[as modifier] An organic cation containing the group —₂⁺ bonded to an organic group. Aromatic diazonium compounds are typically intensely colored and include many synthetic dyes.
- ‘The manufacture of PY74 would most likely occur through diazotization of 2-amino - 5-nitroanisole to the corresponding diazonium salt and condensation of the diazonium salt with o-acetoacetanisidide.’
- ‘These nitrites then react to form a diazonium salt which in turn reacts with a chromogen to produce the final color.’
- ‘Phenol can be produced from aniline by reacting aniline with a mixture of sodium nitrite and hydrochloric acid to give benzene diazonium chloride, that when heated gently, gives off nitrogen to leave phenol.’
- ‘R2 contains 3 mmol / L of diazonium ion and 100 mmol / L of hydrochloric acid.’
Late 19th century: coined in German from diazo- (indicating the presence of two nitrogen atoms) + the suffix -onium (from ammonium).
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