Electronic spectral investigations upon the photochemical transformations of some substituted 1-(N,N-bisacyl)amino-4,5-diphenyl-1,2,3-triazoles

The objective of this report is to investigate the steady state and dynamic photophysical and photochemical properties of 1-(N,N-bisacyl)amino-4,5-dip henyl-1,2,3-triazoles in solvents of different polarity at room temperature and in frozen matrix at 77 K. On the basis of the comparison of their UV a bsorption and luminescence spectra with those of 4,5-diphenyl-1,2,3-triazol e and dibenzamide (model compounds), cleavage of the N-N bond in the title compounds after irradiation with polychrome UV light is proved.