Fluorescence of solutions of 8-azasteroids with α-acyl-β-aminovinyl carbonyl and imino groups

Experiments on observation of the luminescence of 8-azasteroid derivatives and its regularities are carried out for the first time. Strong solvent and excitation wavelength dependences are observed for fluorescence spectra of the compounds investigated, whereas their fluorescence excitation spectra depend only weakly on the fluorescence emission wavelength. An analysis of the data obtained points to the complex character of the electronic structure, important role of intramolecular dynamics, and multicenter character of the behavior of these systems upon absorption of light.