Preparation of New Electron-Accepting π-Conjugated Polyquinoxalines. Chemical and Electrochemical Reduction, Electrically Conducting Properties, and Use in Light-Emitting Diodes was written by Yamamoto, Takakazu;Sugiyama, Kiyoshi;Kushida, Takashi;Inoue, Tetsuji;Kanbara, Takaki. And the article was included in Journal of the American Chemical Society in 1996.HPLC of Formula: 148231-12-3 This article mentions the following:
Dehalogenation polycondensation of 5,8-dibromoquinoxaline derivatives and 2,6-dibromoquinoxaline with zero-valent Ni complex gives a series of π-conjugated polyquinoxalines with mol. weight of 6 × 103-260 × 103. The polymers are electrochem. reduced (or n-doped) with an E° value of -1.75 to -2.35 V vs Ag/Ag+ and converted into elec. conducting materials with a conductivity of 1 × 10-4 to 7 × 10-3 S cm-1 by chem. reduction Poly(quinoxaline-5,8-diyl)s with aromatic substituents give strong fluorescence with emission peaks at 450-520 nm in solutions as well as in cast films. A light-emitting diode (LED), ITO/polymer/Mg(Ag) (polymer = poly(2,3-diphenylquinoxaline-5,8-diyl)), emits blue-green light (λmax at about 500 nm). Introduction of hole-transporting layers such as vacuum-deposited or spin-coated thin layers of poly(thiophene-2,5-diyl), poly(p-phenylene), and poly(N-vinylcarbazole) between ITO and the light-emitting layer enhances electroluminescence efficiency by about 2 orders of magnitude. Polyquinoxalines have an ionization potential of 5.83 ± 0.11 eV and a band gap of 2.56 ± 0.26 eV. In the experiment, the researchers used many compounds, for example, 5,8-Dibromoquinoxaline (cas: 148231-12-3HPLC of Formula: 148231-12-3).
5,8-Dibromoquinoxaline (cas: 148231-12-3) belongs to pyrazine derivatives. Pyrazine derivatives have antitumor, antibiotic, anticonvulsant, antituberculous and diuretic effects as well as kinase, enzymatic and potent tubulin and FtsZ polymerization inhibitory activities. Substituted pyrazines have been found as subunits of multiple synthetically constructed therapeutic agents, as well as several natural products.HPLC of Formula: 148231-12-3