Rоmashko T. Spectral properties of diaminobenzophenones, phthalimidecontaining bichromophores, and pyrene excimers that are conformational mobile in an electron-excited state

The investigations of spectral properties of relaxing in an excited state chromophoric centers - the derivatives of benzophenone and phthalimide, and pyrene excimers - were conducted. The investigations of diaminosubstituted benzophenones show both nonformation of high polarity structures in an excited state and an existence of TICT-process (in particular, for Michler’s ketone). The formation of complexes with hydrogen bonds was established for diaminobenzophenones by calculations in the media, which was modeled by means of the hypothetical box containing water molecules. The interaction of two nonconjugated p-electron systems in phthalimide naphthylmethacrylate was studied by quantum-chemical calculations, which show the formation of an intramolecular interchromophoric state with a charge transfer. It was shown that in chromophore-labeled polymers a chemical bond of chromophore to macromolecule is the factor which increases the degree of aggregation, as compared to solid solutions in polymeric glasses. The spectral dependence for polarization of excimeric emission of pyrene introduced in a polymer matrix was established and was explained by the influence of unequilibrated dimeric configurations on polarization properties of emission. The criterion concerning determination of equilibrium state for excimers, which is based on analysis of spectral intensity distribution in excimeric emission bands, was proposed.