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Linear dichroism, fluorescence anisotropy and quantum chemical studies of dibenzo[cd,lm]perylene and tribenzo[u,cd,Zm]perylene resulted in the assignment of polarization of transitions to several electronic singlet states. The anisotropy data indicate a geometry change in the first excited singlet state of both compounds.

Electronic absorption and emission, fluorescence anisotropy and linear dichroism techniques were applied to dibenzo [j, lm]phenanthro [5,4,3-abcd]perylene in order to determine its electronic structure and check the possibility of existence of conformational isomers. The results indicate the presence of only one conformer. Its structure is proposed on the basis of the experimental data as well as molecular mechanics and quantum chemical calculations.

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