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    Asymmetric Star-Shaped Functionalized Triazine Architecture and Its Electrochromic Device Application
    (ELECTROCHEMICAL SOC INC, 2017) Karatas, Erhan; Guzel, Merve; Ak, Metin
    A new asymmetric functionalized star shaped triazine derivative, namely 2,2'-((6-(quinolin-8-yloxy)-1,3,5-triazine-2,4-diyl)bis(oxy))bis(9H carbazole) (TQC) was synthesized from 2-hydroxy carbazole and 8-hydroxyquinoline. The electrically conductive PTQC film was synthesized via electropolymerization on ITO in a 0.1 M lithium perchlorate/acetonitrile (LiClO4/ACN) electrolyte-solvent couple. H-1-NMR, FTIR and elemental analysis were used to analyze the structure of the TQC. Both electrochemical and spectroelectrochemical studies of the polymer were examined. PTQC revealed color changes between transparent and dark green in the reduced and oxidized states, respectively. Dual type polymer electrochromic devices (ECDs) based on PTQC and poly(3,4-ethylenedioxythiophene) (PEDOT) have been constructed. A potential range of 0 to 2.5 V was found to be proper for working the PTQC/PEDOT device between transparent and blue colors. The spectroelectrochemistry, electrochromic switching, open circuit memory and stability of the device were studied. The properties of the electrochromic device have been investigated such as spectroelectrochemistry, electrochromic switching, stability and open circuit memory. (C) 2017 The Electrochemical Society. All rights reserved.
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    Poly (dithienylpyrrole) / Keggin type (nBu(4)N)(3)[PW9O34(tBuSiOH)(3)] hybrid material: Enhanced optical and electrical properties of conjugated polymers via polyoxometalates
    (ELSEVIER SCIENCE SA, 2018) Soğancı, Tuğba; Torlak, Yasemin; Ak, Metin; Ersöz, Mustafa
    Conductive polymers with unique optical and electrical properties are ideal matrices for redox active inorganic materials in the development of flexible, easily processable conductive materials for promising applications. Polyoxometalates (POMs) are a class of inorganic materials consisting of soluble, anionic metal oxide clusters of transition metals exhibiting enormous versatility in their structural features and properties. The properties as well as the processability of POM clusters can be enhanced by combining them with conducting polymers, either electrostatically or covalently, resulting in organically modified POMs, which have found extensive applications in diverse fields. For this purpose, we electrochemically incorporated a Keggin type POM anion, (nBu(4)N)(3)[PW9O34(tBuSiOH)(3)], into a dithienyl pyrrole based conducting polymer (pDOB). Obtained organicinorganic hybrid composite film has superior optical and electrical properties when compared to PDOB. Also composite film with advantages such as high optical contrast, low response time, long-term stability etc. is promising to meet the requirement for constructing smart windows, supercapacitors and electrochromic devices.
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    Synthesis and Fluorescence Properties of Carbazole Based Asymmetric Functionalized Star Shaped Polymer
    (ELECTROCHEMICAL SOC INC, 2017) Guzel, Merve; Karatas, Erhan; Ak, Metin
    A fluorescent group containing novel asymmetric functionalized star shaped derivative (TPC) of 2,4,6-trichloro-1,3,5-triazine containing 2-hydroxy carbazole and 1-pyrenemethylamine was designed, synthesized and characterized. Polymerization of TPC was achieved in acetonitrile/lithium perchlorate (ACN/LiClO4) solvent/electrolyte couple via electrochemical techniques. Electrochromic properties of the PTPC were investigated via spectroelectrochemistry, kinetic and colorimetry studies. Optoelectrochemical investigation of PTPC displayed electronic transitions at 308, 460 and 780 nm which are correspond to pi-pi* transition, polaron, and bipolaron band formations, respectively. Moreover, electrochromic and fluorescence properties of PTPC were investigated. For the first time, this study reports the huge potential of asymmetric functionalized triazine compounds as electrochromic material. (C) 2016 The Electrochemical Society. All rights reserved.