An experimental study on relationship between hammett substituent constant and electronic absorption wavelength of some azo dyes
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Date
2011Author
Gülseven Sıdır, Yadigar
Sıdır, İsa
Berber, Halil
Taşal, Erol
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In this study, absorption spectra of sixteen azo dyes have been recorded in various solvents. These azo
dyes have substituents such as OH, SO3H, Cl, I, NO2, C2H5 and OCH3 in different positions of phenyl ring.
There is a shift in λmax whose amount is dependent upon the type and position of substituent on the ring.
The effects of substituent on the absorption spectra of azo dyes are interpreted by correlation of
absorption maximum wavelengths (nm) with the hammett substituent parameters. Charge transfer
transitions are observed in inverse direction for azo dyes with electron acceptor substituent compared
to azo dyes with electron donor.
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