Tarkuc, Simge published the artcileThe effect of changes in π-conjugated terthienyl systems using thienyl and ethylenedioxybenzene functionalized thieno[3,4-b]pyrazine precursors: Multicolored low band gap polymers, HPLC of Formula: 52431-30-8, the publication is Electrochimica Acta (2010), 55(24), 7254-7258, database is CAplus.
New classes of thieno[3,4-b]pyrazines containing thienyl and ethylenedioxy Ph units on electron-withdrawing moieties of π-conjugated terthienyl were synthesized. The effect of structural differences on electrochem. and optoelectronic properties of the resulting polymers was studied. Changes in the electronic nature of the functional groups enable to tune the electrochem. properties of the π-conjugated terthienyl monomers by lowering oxidation potential from 0.62 V (DTTP) to 0.56 V (DBTP). Spectroelectrochem. analyses revealed that the neutral polymer (PDBTP) is dark green in its neutral state revealing π-π* transitions in two well-separated bands at 410 and 751 nm. The electronic band gap of polymer, defined as the onset of the π-π* transition, is 1.0 eV. Using the thienyl unit instead of ethylenedioxy Ph, a red shift in the band gap (0.95 eV) is observed The polymer, PDTTP, exhibits multicolor electrochromism and can be switched between a dark yellow neutral state, a green intermediate state, and a brown oxidized state. PDBTP also shows a multicolored electrochromic behavior with three distinct states: dark green at the neutral state, a brown intermediate state, and a brown-violet oxidized state.
Electrochimica Acta 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 C17H14N2O2, HPLC of Formula: 52431-30-8.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary