Dual phosphorescence of 8-azasteroid in ethanol solid solution Original Research Article

This paper presents the results of the investigation of delayed luminescence of 2,3-dimethoxy-8-azagona-1,3,5(10),13-tetraene-12,17-dione classed with 8-azasteroids in ethanol solution at 77 K. Dual phosphorescence with maxima in the region of 400 and 500 nm depending on the excitation wavelength has been discovered. It is shown that the short-wavelength luminescence is due to the radiation transition from second triplet state. The possible mechanisms of emergence of dual phosphorescence in the compound investigated are considered.