Synthesis, substituent effects and solvatochromic properties of some disperse azo dyes derived from N-phenyl-2, 2′-iminodiethanol

A series of monoazo disperse dyes based on N-phenyl-2, 2′-iminodiethanol were synthesized using p-substituted anilines as diazo components. The prepared dyes were characterized by UV-vis, FT-IR and 1H NMR spectroscopic techniques. The effect of varying pH and the evaluation of solvatochromic properties of synthesized dyes with donor-acceptor p-substituted groups are described. The absorption maxima of these dyes changed very significantly by the introduction of various substituents on the para-position of benzene ring.