In 2022,Wang, Weijie; An, Ruiqi; Wang, Tong; Li, Hongxiang; Zhang, Jidong; Tian, Hongkun; Wu, Xiaofu; Tong, Hui; Wang, Lixiang published an article in Giant. The title of the article was 《Nitrogen-bridged star-shaped fused-ring electron acceptors for organic solar cells》.Synthetic Route of C4H2Br2S The author mentioned the following in the article:
Two kinds of nitrogen-bridged star-shaped fused-ring electron acceptors based on benzo[1,2-b:3,4-b′-5,6-b””]tri(4-H-dithieno[3,2-b:2′,3′-d]pyrrole) (BTDTP) core with linear and branched alkyl side chains on bridging nitrogen atoms are developed. Both electron acceptors exhibit strong intramol. charge transfer absorption bands at 500-800 nm (molar extinction coefficient of 3.0 x 105 M-1 cm-1) with narrow optical bandgaps around 1.58 eV, but reveal different mol. packing and morphol. Compared to acceptor with linear side chains, the acceptor bearing branched side chains exhibits ordered face-on orientation with tight π-π stacking, as well as more favorable phase separation morphol. and balanced charge transport when blended with polymer donor PM6. Organic solar cell device based on acceptors bearing branched side chains achieves a power conversion efficiency (PCE) of 9.95% with a fill factor of 74.98% and a short-circuit c.d. of 14.90 mA cm-2, which is much superior to the device using acceptors bearing linear side chains (a PCE of 6.74%). The experimental process involved the reaction of 2,5-Dibromothiophene(cas: 3141-27-3Synthetic Route of C4H2Br2S)
2,5-Dibromothiophene(cas: 3141-27-3) , is mainly used as pharmaceutical intermediate and synthesis intermediate. 2,5-Dibromothiophene may be used as starting reagent for the synthesis of α,α′-didecylquater-, -quinque- and -sexi-thiophenes.Synthetic Route of C4H2Br2S
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary