Cheminet, Nathalie published the artcileElaboration of low-band-gap π-conjugated systems based on thieno[3,4-b]pyrazines, Formula: C4Br2N2O4S, the publication is Pure and Applied Chemistry (2020), 92(2), 335-353, database is CAplus.
In order to understand the electronic contribution of the thienopyrazine building block on the electronic properties of π-conjugated systems, small mols. containing thiophene and thienopyrazine moieties are synthesized and jointly studied by theor. (DFT) and exptl. methods (UV-Vis, UPS). Taking advantages of these preliminar attractive results, four low band gap extended structures have been elaborated on the base of Donor-Acceptor-Donor sequences (DAD); these elongated π-conjugated mols. exhibit noticeable electronic and absorption properties spreading from the near UV to NIR regions.
Pure and Applied Chemistry published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Formula: C4Br2N2O4S.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary