The New Branched Multielectrochromic Materials: Enhancing the Electrochromic Performance via Longer Side Alkyl Chain

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Baycan Koyuncu F., Sefer E., Koyuncu S., Özdemir E.

MACROMOLECULES, vol.44, pp.8407-8414, 2011 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 44
  • Publication Date: 2011
  • Doi Number: 10.1021/ma2013833
  • Journal Name: MACROMOLECULES
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.8407-8414


We describe the synthesis and structure property relationships of two branched electroactive monomers containing carbazole core, 2,5-di(2-thienyl)-1H-pyrrole, differentiated by the length of side alkyl chains (DSNSC-1 and DSNSC-2). Structural identification of initial compounds and products were carried out by using FT-IR and H-1 and C-13 NMR spectroscopy. The electroactive materials DSNSC-1 and DSNSC-2 were directly coated on to ITO glass surface by using electrochemical polymerization process. The results clearly indicate that the length of side alkyl chain has a major impact on optical and electrochemical properties of these polymers. Poly-DSNC-2 with longer side alkyl chain exhibits a high contrast ratio (Delta T% = 68% at 850 nm), a response time of about 0.8 s, and high coloration efficiency (352 cm(2) C-1) and retained its performance by 97.1% even after 5000 cycles.