Electrochemical properties of non-conjugated electrochromic polymers derived from aromatic amine derivatives

Yoshinori Nishikitani, Masaaki Kobayashi, Soichi Uchida, Takaya Kubo

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The electrochemical and optical properties of two types of non-conjugated electrochromic polymers derived from aromatic amine derivatives (DDP-A, DDB-P) are presented. DDP-A is synthesized by the polymerization of N,N′-dimethyl-N,N′-diphenyl-1,4-phenylenediamine (DDP) and acetaldehyde (A), and DDB-P is polymerized with N,N′-dimethyl-N,N′-diphenylbenzidine (DDB) and propionaldehyde (P). Both DDP-A and DDB-P have a band gap in the ultraviolet region, and are colorless and transparent in neutral states. At one-electron oxidation states, DDP-A· + absorbs light mainly in a visible region, whereas DDB-P· + absorbs light mainly in a near-infrared (NIR) region. DDP-A· + and DDB-P· + are nitrogen-centered π-bridged mixed-valence compounds showing intervalence-charge transfer bands. The electrochemical and optical properties of DDP-A and DDB-P depend on the nitrogen-nitrogen distance correlating the electronic coupling of nitrogen redox centers. From the standpoint of energy saving, DDB-P is very interesting because it absorbs light in an NIR region. Finally, focusing on the smart window application, the optical properties of the solid-state electrochromic cell fabricated with DDP-A and heptyl viologen are examined. The cell was confirmed to be colored blue by applying a potential of about 1.0 V, and bleached at 0 V.

Original languageEnglish
Pages (from-to)2035-2040
Number of pages6
JournalElectrochimica Acta
Volume46
Issue number13-14
DOIs
Publication statusPublished - 2001 Apr 2
Externally publishedYes

Keywords

  • Aromatic amine derivatives
  • Heptyl viologen
  • Intervalence-charge transfer bands
  • Non-conjugated electrochromic polymers
  • Solid-state electrochromic cell

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

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