Synthesis, Characterization and Electrochromic Properties of Copolymer of Terephthalic Acid Bis‐(thiophen‐3‐yl‐methyl) Thioester with Thiophene
2006; Taylor & Francis; Volume: 43; Issue: 1 Linguagem: Inglês
10.1080/10601320500406016
ISSN1520-5738
AutoresÖzlem Türkarslan, Ayça Erden, Elif Şahin, Levent Toppare,
Tópico(s)Organic Electronics and Photovoltaics
ResumoTerephthalic acid bis‐(thiophen‐3‐yl‐methyl thioester) (TTMT) was synthesized via the reaction of thiophen‐3‐yl methanethiol with terephthaloyl dichloride. Nuclear magnetic resonance (1H‐NMR) spectroscopy and Fourier transform infrared (FTIR) spectroscopy were utilized for the characterization of the monomer. Electrochemical copolymerization of TTMT with thiophene in acetonitrile/boron trifluoride diethyl etherate (AN/BFEE) (8∶2, v/v) solvent mixture was realized by using tetrabutylammonium tetrafluoroborate (TBAFB) as the supporting electrolyte. The resulting copolymer was characterized via cyclic voltammetry (CV), FTIR, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), four‐probe technique conductivity measurement and UV‐Vis spectroscopy. Spectroelectrochemical analysis of the copolymer, P(TTMT‐co‐Th), reflected π to π* transition at 476 nm and band gap was calculated as 2.03 eV. Kinetic studies were carried out upon measuring the percent transmittance (%T=16%) at the maximum contrast point and switching time (1.25 s). A dual type electrochromic device (ECD) of P(TTMT‐co‐Th) and poly(3,4‐ethylenedioxythiophene) (PEDOT) was constructed. Spectroelectrochemistry, switching ability, open circuit memory and stability of the device were examined by UV‐Vis spectroscopy and cyclic voltammetry. The device switches between brown and blue, exhibits 0.0 V and 2.6 V as the switching voltages and short switching time (1.03 s).
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