In 2022,Dong, Changshuai; Meng, Bin; Liu, Jun; Wang, Lixiang published an article in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices. The title of the article was 《An n-type narrow-bandgap organoboron polymer with quinoidal character synthesized by direct arylation polymerization》.SDS of cas: 3141-27-3 The author mentioned the following in the article:
Narrow bandgap conjugated polymers have received great attention due to their wide applications in optoelectronic devices. Because of the synthetic difficulty, it is greatly challenging to develop n-type conjugated polymers with a narrow bandgap with quinoidal character. Herein, we report an n-type narrow-bandgap organoboron polymer with quinoidal character, PBN-TP. PBN-TP is designed with alternating units of BNBP (double B ← N bridged bipyridine) and quinoidal TP (thieno[3,4-b]pyrazine). Direct arylation polymerization of the di-bromo BNBP unit and the di-hydro TP unit affords the organoboron polymer with a high number-average mol. weight of 28.3 kDa. Compared with the control polymer with alternating units of BNBP and thiophene, PBN-T, the replacement of the thiophene unit with a quinoidal TP unit reduces the bond length alternation (BLA) of carbon-carbon bonds and planarized the polymer backbone of PBN-TP, leading to an enhanced contribution of the polymer quinoidal resonance structure. As a result, compared with PBN-T, PBN-TP shows a much reduced bandgap of 1.50 eV, which is among the lowest reported for n-type organoboron polymers based on BNBP. Moreover, due to the low LUMO energy level, PBN-TP could be readily n-doped and used as an n-type polymer thermoelec. material. This work provides a new n-type narrow bandgap conjugated polymer with quinoidal character. In the experiment, the researchers used many compounds, for example, 2,5-Dibromothiophene(cas: 3141-27-3SDS of cas: 3141-27-3)
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.SDS of cas: 3141-27-3
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary