Absorption and emission spectra of salicylaldehyde azo and related two Schiff bases with the same molecular
skeletons and different functional groups have been studied in various solvents with different polarities. The
solute's photo-physical behavior depends strongly on the solvent–solute interactions and solvent microenvironment
as well as resonance structures of the salicylaldehyde azo and related Schiff bases. In order to understand
the effects of intermolecular interactions on spectral behavior of these substances and to conceive nature and
extent of solvent–solute interactions the spectral variations were analyzed by the linear solvation energy
relationship concept. In addition, the variations of dye dipole moments, from ground to excited states, were
investigated in solvent media by means of solvatochromic method.
کلید واژگان :
Salicylaldehyde azo Schiff base Excited state intramolecular proton transfer Enol-imine Keto-enamine Tautomerism
