9-Ethyl-3-{6-(het)aryl-[1,2,5]oxadiazolo[3,4-b]pyrazin-5-yl}-9H-carbazoles: synthesis and study of sensitivity to nitroaromatic compounds

Push–Pull Derivatives Based on 2,4′-Biphenylene Linker with Quinoxaline, [1,2,5]Oxadiazolo[3,4-B]Pyrazine and [1,2,5]Thiadiazolo[3,4-B]Pyrazine Electron Withdrawing Parts

“…1,2,5-Chalcogenadiazoles and their annulated derivatives have received great attention due to the remarkable combination of their interesting properties, synthesis, and applications in materials sciences [32][33][34][35]. Recently, some of us designed and demonstrated the possible applications of [1,2,5]oxadiazolo [3,4-b]pyrazine derivatives (also called furazanopyrazines) as effective multifunctional chemosensors (I) [36,37], charge-transport materials for photovoltaics (II) [38], and compounds with advanced nonlinear optical (NLO) properties (III) (Figure 2) [39]. Phenylene bridges are typical linkers in push-pull structures, even if the aromaticity of the π-linker is directed toward the ICT [40,41].…”