An organic compound formed by combining an azo group (N=N) with a naphthalene ring structure, used in the manufacture of dyes and pigments.
From 'azo-' (N=N bond) + 'naphthalene' (from naphtha, petroleum fraction + '-ene,' unsaturated hydrocarbon). Synthesized in 19th-century German chemistry labs.
Azonaphthalene compounds are hidden in the bright colors of modern fabrics—when chemists fuse azo groups to naphthalene's double rings, they create pigments that are remarkably lightfast and vivid.
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