Electrochemical reaction of tris(1,10-phenanthroline)iron complexes in some amide-type ionic liquids

Yasushi Katayama, Mami Yoshihara, Takashi Miura

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Electrode reactions of tris(1,10-phenanthroline)iron complexes, [Fe(phen)<inf>3</inf>]<sup>3+/2+</sup>, were investigated in some amide-type ionic liquids. The diffusion coefficients of [Fe(phen)<inf>3</inf>]<sup>2+</sup> and [Fe(phen)3]3+ were smaller than those of tris(2,2'-bipyridine)iron complexes, [Fe(bpy)<inf>3</inf>]<sup>2+</sup> and [Fe(bpy)<inf>3</inf>]<sup>3+</sup>, in each ionic liquid, reflecting the phen complexes are larger than the bpy complexes. The ratio of diffusion coefficient of the trivalent species to that of the divalent one for [Fe(phen)<inf>3</inf>]<sup>3+/2+</sup> was smaller than that for [Fe(bpy)<inf>3</inf>]<sup>3+/2+</sup>, indicating the coulombic interaction between the charged species and the ions composing the ionic liquid is dependent on the charge densities of complexes. The rate constants for [Fe(phen)<inf>3</inf>]<sup>3+/2+</sup> were close to those for [Fe(bpy)<inf>3</inf>]<sup>3+/2+</sup>, suggesting the outer components of reorganization energies for both complexes are similar to each other. On the other hand, the apparent reaction entropies for [Fe(phen)<inf>3</inf>]<sup>3+/2+</sup> were smaller than those for [Fe(bpy)<inf>3</inf>]<sup>3+/2+</sup>, reflecting the difference in the charge densities of complexes.

Original languageEnglish
Pages (from-to)H501-H506
JournalJournal of the Electrochemical Society
Volume162
Issue number8
DOIs
Publication statusPublished - 2015

Fingerprint

Ionic Liquids
Amides
Ionic liquids
amides
Iron
Charge density
iron
diffusion coefficient
liquids
2,2'-Dipyridyl
Rate constants
Entropy
Ions
entropy
Electrodes
electrodes
1,10-phenanthroline
ions
interactions
energy

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Electrochemical reaction of tris(1,10-phenanthroline)iron complexes in some amide-type ionic liquids. / Katayama, Yasushi; Yoshihara, Mami; Miura, Takashi.

In: Journal of the Electrochemical Society, Vol. 162, No. 8, 2015, p. H501-H506.

Research output: Contribution to journalArticle

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