Fluorescence properties of the polyurethane with anchored stilbene chromophore

Some aspects of the trans-cis photoisomerism and fluorescent emission of the stilbene chromophore in polyurethane cationomers were studied comparatively with the urethane-stilbene diol. The stilbene polycations absorbed at λ A = 316 nm and emitted violet-blue light with emission maxima at λ F = 444 nm (dimethyl formamide solution) and λ F = 465 nm (solid state). The redshift of the fluorescent band of the polyurethane stilbene is obvious and suggests that in thin films there are small aggregates of stilbene molecules.