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Synthesis And Electropolymerization Of Bis(phenylthieno[3,2-b]thiophenes)– (4,4'-dinonyl-2,2'-bithiazole) Co-monomer

E. Sezer, Ipek Osken, M. Çinar, M. Çinar, O. Demirel, Belkıs Ustamehmetoğlu, T. Ozturk, T. Ozturk
Published 2016 · Materials Science

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Abstract Synthesis of comonomer possessing 4,4′-dinonyl-2,2′-bithiazole and 3-phenylthieno[3,2-b]thiophene units (PhTT-NBT-PhTT) was performed under Stille cross coupling condition. Its electropolymerization was conducted in the presence of trifluroborate–diethyl ether (BF3·DEE) to lower the electrochemical polymerization potential through a complex formation between heteroaromatic monomers and boron trifluoride. Electrochemical properties of obtained P[PhTT] and P[PhTT-NBT-PhTT] films, such as effect of electrolyte, polymerization charge, potential limits on the redox behaviour were investigated. They were further characterized by UV-visible spectrophotometric measurements. Corresponding electrical equivalent circuit was applied to the experimental electrochemical impedance spectroscopy (EIS) data to explain the parameters of each element and the interface between the Pt/P[PhTT]/BF3·DEE and Pt/P[PhTT-NBT-PhTT]/BF3·DEE systems. The band gap of P[PhTT-NBT-PhTT was obtained as 2.04 eV by in-situ spectroelectrochemical measurements. Frontier molecular orbitals and electropolymerization of the comonomer were assessed computationally.
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