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Electrochemical and optical characterization of a multielectrochromic copolymer based on 3,4-ethylenedioxythiophene and functionalized dithienylpyrrole derivative
摘要： A novel conjugated copolymer, namely poly(3,4-ethylenedioxythiophene-co-1-(3,5-bis(trifluoromethyl)phenyl)-2,5-di(thiophen-2-yl)-1H-pyrrole) (P(EDOT-co-1)) was synthesized via electropolymerization method from a mixture of 3,4-ethylenedioxythiophene and 1-(3,5-bis(trifluoromethyl)phenyl)-2,5-di(thiophen-2-yl)-1H-pyrrole comonomers. The corresponding copolymer has an optical band gap of 1.7 eV and 41% optical contrast at 525 nm with a coloration efficiency of 258 cm2/C and 1.4 s switching time. The copolymer has a multi-electrochromic behavior: It has dark purple, purple, gray, green and cyan colors at different oxidation states. Electrochemical stability of P(EDOT-co-1) copolymer was also investigated and it was observed that the copolymer retained 86% of its stability under ambient conditions in the presence of oxygen (without purging the electrolyte solution with any inert gas) according to the current density and 83% according to the deposited charge even after 1000 redox cycles.
关键词： Copolymerization,SNS,3,4-Ethylenedioxythiophene,EDOT,Multielectrochromism, dithienylpyrrole,Electropolymerization,1,4-di(thiophen-2-yl)butane-1,4-dione,3,5-bis(trifluoromethyl)benzenamine
更新于2025-09-23 15:21:01
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π-Dimerization ability of conjugated oligomer dication diradicaloids composed of dithienylpyrrole and benzodithiophene units
摘要： 2+ composed of 2,5- di(2- thienyl)- N- 2+ and 2 Stable conjugated oligomer dications 1 methylpyrrole (DTP) units at the both ends of the π- systems with methoxy substitu- ents at the 3- position of thienyl units and methylthio end- capping group and benzo[2,1- b:3,4- b′]dithiophene (BDT) unit(s) at the central part with sterically de- manding phenyl substituents were synthesized. From DFT calculations and ESR ex- 2+ was reduced periments, it was concluded that the diradical character in 1 in comparison with the radical character of their reference compound 3·+ composed 2+ was considered to have a of one DTP and one BDT units. In addition, the shorter 1 2+. Nevertheless, judging from the re- further lower diradical character than that of 2 2+ showed a comparable π- 2+ and 2 sults of VT- UV- vis- NIR measurements, both 1 dimerization ability at the DTP moiety in dichloromethane solution with 3·+.
关键词： dithienylpyrrole,diradicaloids,conjugated oligomer dications,benzodithiophene,π- Dimerization
更新于2025-09-10 09:29:36