Star shaped functionalized molecules allow the production of sophisticated nano devices by using them as the building blocks for the formation of superstructured macromolecules. Here, we address star-shaped molecule which is formed by quinoline and electroactive carbazole functionalized triazine (TQEC). Using quinoline as electron accepting (A) and carbazole as electron donating (D) moiety, the resulting conductive polymer is designed to have high optical contrast. The cross-linked polymer (PTQEC) characterized after the electropolymerization of the A/D type molecule has been found to have superior optical and electrical properties. It has high optical contrast (71% at 675 nm), fast switching time about 3 s and high long time redox stability (91.75%). As a result of the spectroelectrochemical and electrochromic characterization, it is determined that PTQEC is transparent and green colored in its neutral and oxidized states, which is a desirable property for smart windows. Therefore electrochromic devices (ECDs) depending on PTQEC and PEDOT were established, where PEDOT functioned as the cathodically coloring layer. Optical and electrochemical characterizations of the device in the way of the optical contrast (51% at 540 nm), switching time (about 3 s), open circuit memory, redox stability (95.36%) and colors were investigated.
There is a limited number of studies in the literature on materials showing electrochromic properties between black and transparent. In this study, black-to-transmissive electrochromic materials have been obtained as a result of electrochemical co-polymerization of carbazole derivatives (Cz1 and Cz2) and EDOT. Homopolymers and copolymers synthesizing different monomer feed ratios have been characterized by electrochemical and spectroelectrochemical methods. A new, simple, and fast method of obtaining black electrochromic material has been proposed.
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/LiClO 4 ) 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 π-π * 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.
A new asymmetric functionalized star shaped triazine derivative, namely 2,2'-((6-(quinolin-8-yloxy)-1,3,5-triazine-2,4diyl)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 (LiClO 4 /ACN) electrolyte-solvent couple. 1 H-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.
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