fused-ring derivatives of quinoxalines: spectroscopic characterization and photoinduced processes investigated by epr spin trapping technique
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ID: 220705
2014
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Abstract
10-Ethyl-7-oxo-7,10-dihydropyrido[2,3-f]quinoxaline derivatives, synthesized as promising biologically/photobiologically active compounds were characterized by UV/vis, FT-IR and fluorescent spectroscopy. Photoinduced processes of these derivatives were studied by EPR spectroscopy, monitoring in situ the generation of reactive intermediates upon UVA (λmax = 365 nm) irradiation. The formation of reactive oxygen species and further oxygen- and carbon-centered radical intermediates was detected and possible reaction routes were suggested. To quantify the investigated processes, the quantum yields of the superoxide radical anion spin-adduct and 4-oxo-2,2,6,6-tetramethylpiperidine N-oxyl generation were determined, reflecting the activation of molecular oxygen by the excited state of the quinoxaline derivative.
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barbierikov2014moleculesfused-ring
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| Authors | ;Zuzana Barbieriková;Dana Dvoranová;Maroš Bella;Viktor Milata;Adriana Czímerová;Vlasta Brezová |
| Journal | Journal of ethnopharmacology |
| Year | 2014 |
| DOI |
10.3390/molecules190812078
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