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Absorption spectra of three aminoazobenzene dyes with various molecular size and alkyl tails have been recorded in solvents in the range between 200 to 600 nm. The photophysical behavior of a dissolved dye depends on the nature of its environment, i.e. the intensity, shape, and maximum absorption wavelength of the absorption band of dye in solution depends strongly on the solvent-solute interactions and solvent nature. The solvatochromic behaviors of aminoazobenzene dyes and solvent- solute interactions can be analyzed by means of linear solvation energy relationships concept proposed by Kamlet and Taft. Bathochromic shift of absorption maxima of these dyes, λmax , occurs in solvent with the highest proton acceptor ability and dipolarity/polarizability.

Solvent Effects on the UV/ Visible Absorption Spectra of Some Aminoazobenzene Dyes