Kudrya V. Spectral properties of the functional pi-electron containing molecular systems with direct electronic excitations transfer

Thesis contains the results of experimental investigations of the electronic excitation energy transfer processes in synthetic and biological compounds (which contain pi-electron systems) by spectral methods and spectral manifestation of sorbtion properties of the grafted co-polymers on the base of chemical complementary poly(acrylamide) and poly(vinylalcohol) (PVA-PAAN). Based on the obtained in present work hierarchy of excited energy levels, the design of supramolecular systems that have the properties of one-way triplet exciton conductivity was done. The functional compounds consisting of 2, 3 and 12 links were created. The spectral testing of their functionality (direct triplet excitation energy transfer) was carried out. The centres of the electronic excitations localization in these functional compounds were identified. The experimental data obtained prove that electronic excitations in the oligonucleotide 5'CCCGGGTTTAAA3' and the biological polynucleotides macromolecules are localized and deactivated from the complex (like exciplex) formed by adenosine and thymidine links. These results are confirmed by the data obtained from the investigations of molecules destruction of the mentioned-above compounds under UV-irradiation. The theoretical calculations of the electronic excitation passing through the functional macromolecule (that consists of 12 links) were done. The results of these calculations are in the good agreement with the experimental data obtained. The optical absorption and spectral luminescence investigation of PVA-PAAN showed that films of this polymer complex sorbed impurity molecules from water. The impurity molecules of benzene ring average size (e.g. phenole molecules) are sorbed by PVA-PAAN films more effectively. The processes of polymer films dissolving in water take place simultaneously. It is shown that the thermal annealing (with the help of special methods) of PVA-PAAN films allows to obtain non-dissolving polymer films which possess high sorbtion ability. The polymer films modified by such method are proposed to be used as the sensors with optical response on phenole presence in water.