Organic soluble linear metallo-supramolecular polymer based on iron(II) and terpyridyl ligand with high electrochromic performance

Xiongchao Shao, Weijun Li, Yu Kuai, Qidi Huang, Yujie Dong, Cheng Zhang, Wai Yeung Wong, Mi Ouyang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Ionic metallo-supramolecular materials possess excellent electrochromic properties due to the coordination of organic ligands and inorganic metal ion. In this paper, we prepared a linear organic soluble metallo-supramolecular electrochromic material named P-FeTPY which was coordinated with terpyridine as organic ligands and Fe(II) as inorganic metal ion. The polymer P-FeTPY whose ligands were modified with alkyl chains could be dissolved in dichloromethane with a solubility of 20 g/L. This indicates the introduction of long alkyl chains is effective to increase solubility of the ionic metallo-supramolecular polymer. The polymer films were spin-coated on the ITO substrate and their electrochemical and electrochromic properties were investigated. P-FeTPY film showed purplish red color with an absorption band at around 580 nm in neutral state due to the metal-to-ligand charge transfer transition, and became colorless due to the oxidization of central metal ion with around 30% change in transmittance. Cyclic voltammetry test demonstrated that P-FeTPY film which showed a couple of redox peaks at 1.15 V and 0.95 V is electrochemically reversible and stable. After 240 switching cycles, 97% of the optical contrast was retained, indicating excellent stability of P-FeTPY film. This work provides an effective path for producing organic soluble ionic metallo-supramolecular materials, which is solution processible and will greatly benefit the large area production in future industrial applications.

Original languageEnglish
Article number116953
JournalSynthetic Metals
Volume282
DOIs
Publication statusPublished - Dec 2021

Keywords

  • Electrochromic
  • Metallo-supramolecular
  • Solution processible

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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