Anna Szemik-Hojniak
University of Wroclaw, Poland
Title: : The behavior of trans-styryl derivatives under the UV light irradiation
Biography
Biography: Anna Szemik-Hojniak
Abstract
The remarkable properties of functionalized styryl dyes as the stilben derivatives containing the variously substituted (-C6H5-CH =C) core are the subject of continuing interest. Despite that different substituents are incorporated into the aromatic rings and are allowed to obtain a numerous push-pull type donor-acceptor systems widely used in modern technologies, nonetheless, as they are also the representatives of bioactive heterocycles, they find application in various aspects of medicine and pharmacology. These molecules, on the UV light irradiation find themselves in the electronic excited state and depending on the environmental conditions their physico-chemical properties significantly change. Keeping in mind the known biological relevance of heterocyclic N-oxides that may cause apoptosis in human cells (e.g., K562 ), we decided to investigate the trans-4 - [4 '- (N, N dimethylamino-styryl)] pyridine N-oxide (DPO),2-(4-methoxy-trans-styryl)quinoline-1-oxide (MSQNO) and its hybrid complex with the ZnTPP unit.DFT and TD DFT calculations shown that in protic media, the trans-DPO system is able to form the hydrogen bonded complexes, allowing to find new applications in Biochemistry and Pharmacology. In this talk, we will discuss the charge transfer process in the excited state, the photo physical properties of these three compounds via. a vis polarity of the solvent, and differences caused by a weaker electron donor (methoxy group) substitution in MSQNO relative to [(-CH3)2N] group in DPO. A focus on theoretical aspect will be referred to a strong reference to experiment
