Azo: Dye

The defining feature of an azo dye is the azo linkage connecting two aromatic fragments, typically aryl groups. This arrangement creates an extensive , which allows the molecule to absorb energy in the visible light spectrum (400–800 nm), resulting in intense, stable colors.

Azo dyes are a dominant class of synthetic organic colorants, characterized by the presence of one or more ( azo dye

Because they are highly versatile, azo dyes are used across a vast range of commercial sectors: Azo Dyes - an overview | ScienceDirect Topics The defining feature of an azo dye is

: An aromatic amine reacts with nitrous acid at low temperatures to form a diazonium salt . : The diazonium salt acts as an electrophile,

: The diazonium salt acts as an electrophile, reacting with an electron-rich nucleophile (like a phenol or another aromatic amine) to create the final azo bond. Industrial and Biological Applications