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 language | English |
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Pages (from-to) | 1003-1012 |
Number of pages | 10 |
Journal | Physical Chemistry Chemical Physics |
Volume | 9 |
DOIs | |
Publication status | Published - 2007 |
Keywords
- CHIRAL MODIFIED ELECTRODES
- RU-POLYPYRIDINE COMPLEXES
- METAL-COMPLEXES
- VINYLBIPYRIDINE COMPLEXES
- CHARGE-TRANSPORT
- FILMS
- RUTHENIUM
- POLYMERIZATION
- ELECTROPOLYMERIZATION
- VINYLPYRIDINE