A narrow range multielectrochromism from 2,5-di-(2-thienyl)-1H-pyrrole polymer bearing pendant perylenediimide moiety


Sefer E., Bilgili H., GÜLTEKİN B. , Tonga M., KOYUNCU S.

DYES AND PIGMENTS, cilt.113, ss.121-128, 2015 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 113
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.dyepig.2014.08.003
  • Dergi Adı: DYES AND PIGMENTS
  • Sayfa Sayısı: ss.121-128

Özet

A new 2,5-di-(2-thienyl)-1H-pyrrole (SNS) moiety containing perylenediimide (PDI) acceptor as pendant side chain has been synthesized for an electroactive monomer and then directly deposited onto ITO/glass surface via electrochemical polymerization process. The observed electronic interaction only at the excited state due to the presence of phenylene spacer between SNS-donor and PDI-acceptor moiety leads to efficient fluorescence quenching. This charge separation behavior was also proved by theoretical DFT calculations. Thin films of the polymer electropolymerized onto transparent electrode exhibited ambipolar multi-electrochromic behavior including purple, violet-red-khaki-blue colors in both anodic and cathodic regime only between -1.2 and 1.0 V. We further demonstrated that this polymer film has a high contrast ratio (Delta T = 45% at 900 nm), a faster response (0.5 s), high coloration efficiency (254 cm(2) C-1) and retained its performance by 92% even after 5000 cycles. (C) 2014 Elsevier Ltd. All rights reserved.