Electrochemical properties of a new star-shaped pyrrole monomer and its electrochromic applications

Ak M., Ak M. S. , Toppare L.

MACROMOLECULAR CHEMISTRY AND PHYSICS, vol.207, no.15, pp.1351-1358, 2006 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 207 Issue: 15
  • Publication Date: 2006
  • Doi Number: 10.1002/macp.200600178
  • Page Numbers: pp.1351-1358
  • Keywords: conducting polymers, electrochromic window, star-shaped polymers, POLYMER, DEVICES, CHAIN


A new monomer, 2,4,6-tris(4-(1H-pyrroI-1-yl) phenoxy)-1,3,5-triazine (Tria-Py) was synthesized via the reaction,of 4-(1H-pyrrol-1-yl)phenol with 2,4,6-trichloro-1,3, 5-triazine. It was electrochemically polymerized in a dichloromethane/acetonitrile solvent mixture. The polymer P(Tria-Py) was characterized via CV, FTIR, SEM and uv-vis spectroscopy. Spectroelectrochemical analysis revealed electronic transitions at 346, 508 and 665, nm, revealing pi to pi* transitions, and polaron and bipolaton band formations respectively, We also made a dual-type, complementary-colored electrochromic device using P(Tria-Py)/poly(3,4-ethylenedioxythiophene) (PEDOT) in a sandwich configuration. The device switches between dark blue and red colors with a switching time of 2.2 s and an optical contrast (% Delta T) of 25%.