An experimental study on relationship between hammett substituent constant and electronic absorption wavelength of some azo dyes

Authors : Yadigar Gülseven SİDİR, Yadigar GÜLSEVEN SIDIR, İsa SİDİR, Isa SIDIR, Halil BERBER, Halil BERBER, Erol TAŞAL, Erol TASAL

Pages : 7-11

Doi:10.17678/beuscitech.47153

View : 25 | Download : 8

Publication Date : 2011-12-23

Article Type : Research Paper

Abstract :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 ?max 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 insert ignore into journalissuearticles values(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
Keywords : Absorption spectra, azo dye, electronic charge transfer hammett substituent constant, non linear optic