Are molecular 5,8-π-extended quinoxaline derivatives good chromophores for photoluminescence applications? was written by Mancilha, Fabiana S.;Da Silveira Neto, Brenno A.;Lopes, Aline S.;Moreira, Paulo F. Jr.;Quina, Frank H.;Goncalves, Reinaldo S.;Dupont, Jairton. And the article was included in European Journal of Organic Chemistry in 2006.Recommanded Product: 5,8-Dibromoquinoxaline This article mentions the following:
The synthesis of a new series of photoluminescent compounds, namely 5,8-diarylquinoxalines (aryl = Ph, 4-FC6H4,4-MeOC6H4, $-NCC6H4), was achieved by a direct Suzuki cross-coupling reaction using a NCP-pincer palladacycle. The electrochem. and photophys. properties of these compounds were also investigated. Four new 4,8-diaryl-2,1,3-benzothiadiazoles were also synthesized in order to enable a comparison between the two types of nitrogen-containing π-extended heterocycles. The substitution of a hydrogen atom at the 4-position of the aryl group attached to the quinoxaline or benzothiadiazole base by either electron-donating or -withdrawing groups results in an increase in the bandgap energy (from 2.21 to 2.52 eV) of π-extended 5,8-quinoxaline derivatives and a decrease in the bandgap energy (from 2.65 to 2.40 eV) of π-extended 2,1,3-benzothiadiazoles. Moreover, π-extension at the 5- and 8-positions of the quinoxaline core is not essential for the photoluminescence of these compounds and 4,7-π-extended 2,1,3-benzothiadiazoles are far better candidates for luminescence applications than are the quinoxaline derivatives In the experiment, the researchers used many compounds, for example, 5,8-Dibromoquinoxaline (cas: 148231-12-3Recommanded Product: 5,8-Dibromoquinoxaline).
5,8-Dibromoquinoxaline (cas: 148231-12-3) belongs to pyrazine derivatives. Pyrazines are volatile compounds that are used in the cosmetic, food, flavor, and fragrance industries. Pyrazine-based skeletons were incorporated into agents targeting a range of ailments. Many derivatives were synthesized and evaluated as potential cancer treatments.Recommanded Product: 5,8-Dibromoquinoxaline