Relating to or containing a chemical group formed by connecting an azo compound (with a nitrogen-to-nitrogen double bond) to a benzene ring.
From azo- (from French azote, 'nitrogen') + phenyl (from Greek pheno-, 'showing' + -yl, 'radical'). This term emerged in 19th-century organic chemistry as chemists systematically named compounds containing azo linkages attached to benzene derivatives.
Azophenyl compounds are the building blocks of azo dyes, which revolutionized the textile industry in the 1800s and are still used to color about 60% of textiles today—all thanks to understanding how nitrogen bonds to carbon rings.
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