Hybrid Ferrocenyl Redox Gold Nanoparticles. Multielectronic Transfer and Ion-Specific Deposition
Nanoparticules d'or redox ferrocényliques hybrides. Transfert multiélectronique et déposition en fonction des ions.
Résumé
The electrochemistry of alkyl-ferrocene gold nanoparticles including varying percentages of ferrocenyl ligands was examined in steady conditions for their interest as multielectronic redox systems in solution. By selecting anion of the electrolyte and solvent, it was possible to obtain a negligible deposition of the nanoparticles regardless of their composition. We found that CH 2 Cl 2 as a solvent with tetrabutylammonium tetrakis(3,5bis(trifluoromethyl)phenyl) borate (NBu 4 BarF) as electrolyte leads to a diffusive response in the ~1 micromolar solubility limits (up to ~10 -4 molar equivalent of ferrocene moieties) in steady state condition on a 10 m diameter microelectrode. Detailed characterizations of the nanoparticles using TEM, 1H NMR (1D and 2D DOSY) were used to get an average molecular formula and diffusion coefficient of the different species. Using these values, estimation of the plateau diffusion current shows a good agreement with experimental data but also that only 50% of the ferrocenyl moieties attached onto the nanoparticles contributes to the current.
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