Nau, Jennifer; Bruening, Vincent; Biesen, Lukas; Knedel, Tim-Oliver; Janiak, Christoph; Mueller, Thomas J. J. published an article in 2022. The article was titled 《Synthesis and Electronic Properties of Conjugated syn,syn-Dithienothiazine Donor-Acceptor-Donor Dumbbells》, and you may find the article in European Journal of Organic Chemistry.Category: pyridine-derivatives The information in the text is summarized as follows:
A series of conjugated syn,syn-dithienothiazine donor-acceptor-donor dumbbells was readily synthesized by Suzuki coupling or a one-pot α-lithiation-zincation-Negishi coupling sequence in moderate to good yield. The title compounds were all electron-rich reversible oxidizable redox systems with a relatively narrow range of oxidation potentials according to cyclic voltammetry. UV/Vis and fluorescence spectroscopy however showed a significant effect of the electronic nature of the conjugated bridging system on absorption and emission characteristics. Furthermore, a highly polar excited state was corroborated by Lippert-Mataga anal. of the emission solvatochromicity as well as by TD-DFT calculation of absorption and emission maxima, which classified these dumbbell systems as redox active, luminescent low band gap chromophores with exptl. determined optical band gaps between 2.20 and 2.50 eV. In the part of experimental materials, we found many familiar compounds, such as 2,5-Dibromopyridine(cas: 624-28-2Category: pyridine-derivatives)
2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. In industry and in the lab, pyridine is used as a reaction solvent, particularly when its basicity is useful, and as a starting material for synthesizing some herbicides, fungicides, and antiseptics.Category: pyridine-derivatives