Diazotization and coupling reactions of differently substituted aromatic amines and investigation of their solvatochromic behaviour

Prompted by the diverse applications of azo compounds, twenty four phenolic azo compounds have been synthesized and characterized by IR and 1H NMR spectral techniques. The UV absorption maxima of each compound were determined in ethanol to investigate the substituent effect in the synthesized compounds. It was found that electron releasing group produced maximum bathochromic shift. To understand the effect of solvent on absorption maxima, the behaviour of three representative azo compounds (3b, 7b and 8b) was also investigated in eight solvents having a variety of polarity, it was observed that the highest polar solvent produced maximum bathochromic shift in all cases.

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