Electrochemical deposition of poly(trans-[RuCl2(4-vinylpyridine)(4)]) and its reductive desorption: cyclic voltammetry and electrochemical quartz crystal microbalance studies

Merlin C. E. Bandeira, Joe A. Crayston, Cesar V. Franco, Andrew Glidle

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The electropolymerization of trans-[RuCl2(vpy)(4)] (vpy = 4-vinylpyridine) on Au or Pt electrodes was studied by cyclic voltammetry and the electrochemical quartz crystal microbalance (EQCM) technique. Cyclic voltammetry of the monomer in DMSO on Au shows reductions at -2.0 and-2.2 V. Potential cycling over the first wave leads to polymer formation; however, scanning over the second wave leads to desorption of the polymer. These observations were confirmed by EQCM measurements which also revealed a high polymerization efficiency. Electrolysis, EQCM and XPS measurements showed that desorption was associated with substitution of chloride ligands by DMSO when the polymer was in a highly reduced state. The film also showed reversible mass changes due to the oxidation and accompanying ingress of charge-balancing anions and solvent into the film. Measurements on the dried films revealed that large quantities of solvent are trapped in the film during the electropolymerization process.

Original languageEnglish
Pages (from-to)1003-1012
Number of pages10
JournalPhysical Chemistry Chemical Physics
Volume9
DOIs
Publication statusPublished - 2007

Keywords

  • CHIRAL MODIFIED ELECTRODES
  • RU-POLYPYRIDINE COMPLEXES
  • METAL-COMPLEXES
  • VINYLBIPYRIDINE COMPLEXES
  • CHARGE-TRANSPORT
  • FILMS
  • RUTHENIUM
  • POLYMERIZATION
  • ELECTROPOLYMERIZATION
  • VINYLPYRIDINE

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