Browsing by Author "Cansu-Ergun, E. G."

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    Carbazole Based Electrochromic Polymers Bearing Ethylenedioxy and Propylenedioxy Scaffolds
    (2018) Cansu-Ergun, E. G.; Onal, A. M.; https://orcid.org/0000-0002-3941-4345; I-7385-2017
    In this study, synthesis of two new monomers; 2-(2,3-dihydrothieno[3,4-b] (1,4] dioxin-5-yl)-7(2,3-dihydrothieno [3,4-b][1,4]dioxin-7-yl)-9H-carbazole (ECzE) and 2-(3,3-dihexy1-3,4-dihydro2H-thieno[3,4-b][1,4]dioxepin-6yl)-7-(3,3-dihexyl-3,4-dihydro-2H-thieno[3,4-b] [1,4] dioxepin-8-yl)-9H-carbazole (PCzP), via Stille cross-coupling reaction and their electrochemical polymerization both by repetitive cycling and by constant potential electrolysis was reported. The electrochemical and optical properties of the monomers and their corresponding polymers, PECzE and PPCzP, were investigated and it was found that 3,4-ethylenedioxythiophene (EDOT) unit containing monomer and polymer (ECzE and PECzE) have lower oxidation potentials and lower band gap values as compared to dihexyl substituted 3,4-propylenedioxythiophene (PRODOT-6) unit containing monomer and polymer (PCzP and PPCzP). Spectroelectrochemical studies revealed that both of the polymer films exhibit multielectrochromic behavior as well as good electrochemical stability. Moreover, PPCzP was found to be soluble in some organic solvents and its solution in tetrahydrofuran can be reversibly oxidized and reduced using chemical reagents. A dual-type electrochromic device was also constructed using soluble PPCzP as the anodically coloring material and the optical studies were performed on the device. The electrochromic device showed good electrochromic response, such as reasonable coloration efficiency and redox stability.
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    Synthesis and electro-optical properties of a new copolymer based on EDOT and carbazole
    (2016) Akbayrak, M.; Cansu-Ergun, E. G.; Onal, A.M.
    A new copolymer of 3,4-ethylenedioxythiophene (EDOT) and 5-(2-ethylhexyl)-1,3-bis(9-methyl-9H-carbazol-3-yl)-5H-thieno[3,4-c]pyrrole-4,6-dione (CzPDICz) was electrochemically synthesized using different monomer feed ratios. The resulting copolymer films were investigated in terms of their electrochemical and electro-optical behaviors. Properties of the obtained copolymer films through different monomer feed ratios were compared to each other and to individual poly(ethylenedioxythiophene; PEDOT) and homopolymer of CzPDICz in order to observe the differences in the properties with respect to PEDOT and P(CzPDICz). Copolymers exhibited well adherence on the electrode surface with having non-diffusional redox process. The monomer feed ratios were prepared as 9:1; 4:1, and 1:1 (EDOT:CzPDICz) and changes in the electrochemical and spectroelectrochemical behavior were noted with increasing CzPDICz ratio in the monomer mixture. Although no appreciable change in the optical band gap values of the copolymers was noted as compared to PEDOT, the neutral blue copolymers exhibited grayish color in their semi-oxidized states and transparent green in their fully oxidized states.