Electrochemical behavior of iron and several iron complexes in hydrophobic room temperature molten salts

Masaki Yamigata, Naoki Tachikawa, Yasushi Katayama, Takashi Miura

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The electrochemical behavior of Fe(III)/Fe(II), FeCp2 +/FeCp2, FeCl4-/ FeCl 42- FeBr4-/FeBr4 2- and Fe(CN)63-/Fe(CN)6 4- couples in 1-n-butyl-1-methylpyrrolidinium bis(trifluoromethansulfone) imide (BMPTFSI) room-temperature molten salt was studied by means of cyclic voltammetry. The electrode reaction of Fe(III)/Fe(II) on a platinum electrode was quasi-reversible due to the slow electron transfer while those of other iron complex couples were reversible. The slow electron transfer of the Fe(III)/Fe(II) couple may be related to the strong interaction of the Fe(III)/Fe(II) redox center with surrounding bulky TFS- anions. Each iron complex couple showed its own redox potential, indicating the ligands of Cp-, C-1, Br- and CN- are not replaced with TFSI- having a small donor number. The electrochemical behavior of Fe(CN)63TFe(CN) 64- couples was also investigated in several molten salts which had different organic cations. The redox potential seems to be affected by the acceptor property of the organic cation.

Original languageEnglish
Title of host publicationMolten Salts XIV - Proceedings of the International Symposium
Number of pages10
Publication statusPublished - 2006 Dec 1
Event206th ECS Meeting - Honolulu, HI, United States
Duration: 2004 Oct 32004 Oct 8

Publication series

NameProceedings - Electrochemical Society
VolumePV 2004-24


Other206th ECS Meeting
Country/TerritoryUnited States
CityHonolulu, HI

ASJC Scopus subject areas

  • Engineering(all)


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