Electrochemical behavior of several iron complexes in hydrophobic room-temperature ionic liquids

Masaki Yamagata; Naoki Tachikawa; Yasushi Katayama; Takashi Miura

doi:10.1016/j.electacta.2006.10.008

Electrochemical behavior of several iron complexes in hydrophobic room-temperature ionic liquids

Masaki Yamagata, Naoki Tachikawa, Yasushi Katayama, Takashi Miura

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

100 Citations (Scopus)

Abstract

The electrochemical behavior of FeCp₂⁺/FeCp₂ (Cp^-, cyclopentadienyl), FeCl₄^-/FeCl₄^2-, FeBr₄^-/FeBr₄^2- and Fe(CN)₆^3-/Fe(CN)₆^4- couples was studied in the hydrophobic room-temperature ionic liquids based on bis(trifluoromethylsulfonyl)imide (TFSI^-) with 1-n-butyl-1-methylpyrrolidinium (BMP⁺) and other quaternary ammonium cations. The cyclic voltammetric data indicated that these complexes were stable in BMPTFSI and that the redox reactions between trivalent and divalent iron species of these complexes are electrochemically reversible. The diffusion coefficients of these complexes were found to be affected mainly by the size of the species. On the other hand, the redox potential of Fe(CN)₆^3-/Fe(CN)₆^4- couple depended on organic cations reflecting the difference in the acceptor properties of the organic cations.

Original language	English
Pages (from-to)	3317-3322
Number of pages	6
Journal	Electrochimica Acta
Volume	52
Issue number	9
DOIs	https://doi.org/10.1016/j.electacta.2006.10.008
Publication status	Published - 2007 Feb 15

Keywords

Acceptor property
Complex
Iron
Room-temperature ionic liquid

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry

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10.1016/j.electacta.2006.10.008

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title = "Electrochemical behavior of several iron complexes in hydrophobic room-temperature ionic liquids",

abstract = "The electrochemical behavior of FeCp2+/FeCp2 (Cp-, cyclopentadienyl), FeCl4-/FeCl42-, FeBr4-/FeBr42- and Fe(CN)63-/Fe(CN)64- couples was studied in the hydrophobic room-temperature ionic liquids based on bis(trifluoromethylsulfonyl)imide (TFSI-) with 1-n-butyl-1-methylpyrrolidinium (BMP+) and other quaternary ammonium cations. The cyclic voltammetric data indicated that these complexes were stable in BMPTFSI and that the redox reactions between trivalent and divalent iron species of these complexes are electrochemically reversible. The diffusion coefficients of these complexes were found to be affected mainly by the size of the species. On the other hand, the redox potential of Fe(CN)63-/Fe(CN)64- couple depended on organic cations reflecting the difference in the acceptor properties of the organic cations.",

keywords = "Acceptor property, Complex, Iron, Room-temperature ionic liquid",

author = "Masaki Yamagata and Naoki Tachikawa and Yasushi Katayama and Takashi Miura",

note = "Funding Information: The present work was financially supported by Grant-in-Aid for Scientific Research on Priority Areas of “Science of Ionic Liquids” (No. 17073016) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan (MEXT). This study was also supported by a JSPS Research Fellowships for Young Scientists and by Grant-in-Aid for the 21st Century COE program “KEIO Life Conjugate Chemistry” from MEXT. The authors also thank to Kanto Denka Kogyo for supplying LiTFSI.",

year = "2007",

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T1 - Electrochemical behavior of several iron complexes in hydrophobic room-temperature ionic liquids

AU - Yamagata, Masaki

AU - Tachikawa, Naoki

AU - Katayama, Yasushi

AU - Miura, Takashi

N1 - Funding Information: The present work was financially supported by Grant-in-Aid for Scientific Research on Priority Areas of “Science of Ionic Liquids” (No. 17073016) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan (MEXT). This study was also supported by a JSPS Research Fellowships for Young Scientists and by Grant-in-Aid for the 21st Century COE program “KEIO Life Conjugate Chemistry” from MEXT. The authors also thank to Kanto Denka Kogyo for supplying LiTFSI.

PY - 2007/2/15

Y1 - 2007/2/15

N2 - The electrochemical behavior of FeCp2+/FeCp2 (Cp-, cyclopentadienyl), FeCl4-/FeCl42-, FeBr4-/FeBr42- and Fe(CN)63-/Fe(CN)64- couples was studied in the hydrophobic room-temperature ionic liquids based on bis(trifluoromethylsulfonyl)imide (TFSI-) with 1-n-butyl-1-methylpyrrolidinium (BMP+) and other quaternary ammonium cations. The cyclic voltammetric data indicated that these complexes were stable in BMPTFSI and that the redox reactions between trivalent and divalent iron species of these complexes are electrochemically reversible. The diffusion coefficients of these complexes were found to be affected mainly by the size of the species. On the other hand, the redox potential of Fe(CN)63-/Fe(CN)64- couple depended on organic cations reflecting the difference in the acceptor properties of the organic cations.

AB - The electrochemical behavior of FeCp2+/FeCp2 (Cp-, cyclopentadienyl), FeCl4-/FeCl42-, FeBr4-/FeBr42- and Fe(CN)63-/Fe(CN)64- couples was studied in the hydrophobic room-temperature ionic liquids based on bis(trifluoromethylsulfonyl)imide (TFSI-) with 1-n-butyl-1-methylpyrrolidinium (BMP+) and other quaternary ammonium cations. The cyclic voltammetric data indicated that these complexes were stable in BMPTFSI and that the redox reactions between trivalent and divalent iron species of these complexes are electrochemically reversible. The diffusion coefficients of these complexes were found to be affected mainly by the size of the species. On the other hand, the redox potential of Fe(CN)63-/Fe(CN)64- couple depended on organic cations reflecting the difference in the acceptor properties of the organic cations.

KW - Acceptor property

KW - Complex

KW - Iron

KW - Room-temperature ionic liquid

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Electrochemical behavior of several iron complexes in hydrophobic room-temperature ionic liquids

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Keywords

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