Near infrared electrochromic polymers based on phenazine moieties

Esmer E. N., Tarkuc S., UDUM Y., TOPPARE L. K.

MATERIALS CHEMISTRY AND PHYSICS, vol.131, pp.519-524, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 131
  • Publication Date: 2011
  • Doi Number: 10.1016/j.matchemphys.2011.10.014
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.519-524
  • Keywords: Polymers, Electrochemical techniques, Electrochemical properties, Optical properties, OPTICAL ATTENUATOR, CONDUCTING POLYMER
  • Middle East Technical University Affiliated: Yes


New fused-aromatic quinoxaline and thieno[3,4-b]pyrazine based monomers; 10,12-bis(4-hexylthiophen-2-yl)dibenzo[f,h]thieno[3,4-b]quinoxaline (HTBQ) and 10,13-bis(4-hexylthiophen-2-yl)dipyrido[3,2-a:2',3'-c]phenazine (HTPP) were synthesized. Electrochemical polymerization of HTBQ and HTPP were performed in acetonitrile/dichloromethane (ACN/DCM) solution containing LiClO(4)/NaClO(4). Spectroelectrochemical behavior and switching ability of PHTBQ and PHTPP films were investigated by UV-vis spectroscopy. The polymer films showed reversible electrochemical oxidation with high contrast ratios in the NIR region with low switching times. PHTBQ revealed color changes between brick color and green in the reduced and oxidized states. PHTPP changed color from green to gray when the polymer film was switched between its redox states. (C) 2011 Elsevier B.V. All rights reserved.