A positively charged ion with a diazo group (-N≡N⁺) bonded to an organic group, extremely important in organic synthesis and azo dye production.
From 'diazo' + '-nium' suffix (indicating a positively charged species). Terminology established in 19th-century organic chemistry when these ions were first characterized.
Diazonium salts are like chemical grenades with a timer—you generate them from an amine, they're explosively reactive for a few minutes, then you use them to attach almost any group to benzene rings.
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