DICHROISM OF ABSORPTION AND POLARIZATION OF PHOSPHORESCENCE OF MOLECULES OF THE CLOSED-FORM OF NITROBENZOSPIROTHIOPYRAN

The spectral-polarization characteristics of absorption and phosphores cence of molecules of the initial form of nitro-substituted indolinosp irobenzothiopyran were studied in oriented polyethylene films and in s olutions with different polarity. An oscillator model of the electron transitions responsible for the formation of absorption and luminescen ce spectra was suggested. It was established that the principal differ ences in the spectral and photophysical properties of the compound stu died and its oxygen-containing analog are associated with the fact tha t the electronegativity of the S atom is lower than that of the O atom .