06. Coupling reactions of diazonium salts

What is azo dye?

chromophore (responsible for colour)

Where does colour of azo dye come from?

N=N linking 2 aromatic groups -> Absorbs light from visible spectrum, specifically blue region, which gives out orange/red

How can colours be varied?

Using aromatic molecules with different groups substituted on benzene ring

Where are coupling reactions important?

Dyestuffs industry