SOLUTE-SOLVENT INTERACTIONS AND PHOTOPHYSICAL BEHAVIOR OF SOME AZOQUINOLINE DYES IN VARIOUS ENVIRONMENTS

It is well-known that the photophysical behavior of a dissolved dye depends on the nature ofits environment, i.e. the intensity, shape, and maximum absorption wavelength of theabsorption band of dye in solution depends strongly on the solvent-solute interactions andsolvent nature [1,2]. This effect is closely related to the nature and degree of dye–solventinteraction. The solute-solvent interaction of aromatic azo dyes in ordered nematic liquidcrystals is an important issue and many valuable investigations have been carried out on thespectral behavior of these systems by many researchers [3].