noun[as modifier] Chemistry
An organic cation containing the group —2+ bonded to an organic group. Aromatic diazonium compounds are typically intensely colored and include many synthetic dyes.
- 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.
- 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.
Late 19th century: coined in German from diazo- (indicating the presence of two nitrogen atoms) + the suffix -onium (from ammonium).
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