Electrode reactions of ruthenium-bipyridine complex in amide-type ionic liquids

Yuichi Toshimitsu, Yasushi Katayama, Takashi Miura

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Abstract

The electrode kinetics of [Ru(bpy) 3] 3+/[Ru(bpy) 3] 2+ (bpy = 2,2′-bipyridine) on a platinum electrode was investigated in room-temperature ionic liquids, 1-butyl-1- methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide (EMITFSA), and 1-butyl-1-methylpyrrolidinium bis(perfluoroethylsulfonyl)amide (BMPBETA) over the temperature range from 25 to 45 °C. The diffusion coefficients of [Ru(bpy) 3] 2+ and [Ru(bpy) 3] 3+ were found to be affected not only by the viscosity of ionic liquids but also by the charge density of the complex. The activation energy for the diffusion coefficients of these complexes in the ionic liquids were close to that for the viscosity of the ionic liquids. The standard rate constants of [Ru(bpy) 3] 3+/[Ru(bpy) 3] 2+ in BMPTFSA, EMITFSA and BMPBETA were estimated by electrochemical impedance spectroscopy. The standard rate constants in the ionic liquids were estimated to be smaller than those in aqueous and organic electrolytes, probably due to the slow dynamics of the ionic liquids.

Original languageEnglish
Pages (from-to)43-47
Number of pages5
JournalElectrochimica Acta
Volume82
DOIs
Publication statusPublished - 2012 Nov 1

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Keywords

  • Diffusion
  • Ionic liquid
  • Rate constant
  • Ruthenium-bipyridine complex

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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