Dye | Azo

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.

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

The synthesis of these dyes usually involves a two-step process: The defining feature of an azo dye is

: An aromatic amine reacts with nitrous acid at low temperatures to form a diazonium salt . resulting in intense