Ultralong π-conjugated bis(Terpyridine)metal polymer wires covalently bound to a carbon electrode: Fast redox conduction and redox diode characteristics

Kuo Hui Wu, Ryota Sakamoto, Hiroaki Maeda, Eunice Jia Han Phua, Hiroshi Nishihara

Research output: Contribution to journalArticlepeer-review

Abstract

We developed an efficient and convenient electrochemical method to synthesize π-conjugated redox metal-complex linear polymer wires composed of azobenzene-bridged bis(terpyridine)metal (2-M, M = Fe, Ru) units covalently immobilized on glassy carbon (GC). Polymerization proceeds by electrochemical oxidation of bis(4-(4-anilino)-2,2:6,2”-terpyridine)metal (1-M) in a water–acetonitrile– HClO4 solution, affording ultralong wires up to 7400 mers (corresponding to ca. 15 µm). Both 2-Fe and 2-Ru undergo reversible redox reactions, and their redox behaviors indicate remarkably fast redox conduction. Anisotropic hetero-metal-complex polymer wires with Fe and Ru centers are constructed via stepwise electropolymerization. The cyclic voltammograms of two hetero-metal-complex polymer wires, GC/[2-Fe]–[2-Ru] (3) and GC/[2-Ru]–[2-Fe] (4), show irreversible redox reactions with opposite electron transfer characteristics, indicating redox diodelike behavior. In short, the present electrochemical method is useful to synthesize polymer wire arrays and to integrate functional molecules on carbon.

Original languageEnglish
Article number4267
JournalMolecules
Volume26
Issue number14
DOIs
StatePublished - 2 Jul 2021

Keywords

  • Coordination polymer
  • Diode
  • Electron transfer
  • Electropolymerization
  • Hetero-metal complex
  • Modified electrode
  • Redox

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