Electrochemical study on aluminum speciation in Lewis acidic chloroaluminate-bis(trifluoromethylsulfonyl)amide mixed ionic liquids

Yasushi Katayama; Takumi Wakayama; Naoki Tachikawa; Kazuki Yoshii; Nobuyuki Serizawa

doi:10.5796/electrochemistry.17-00077

Electrochemical study on aluminum speciation in Lewis acidic chloroaluminate-bis(trifluoromethylsulfonyl)amide mixed ionic liquids

Yasushi Katayama, Takumi Wakayama, Naoki Tachikawa, Kazuki Yoshii, Nobuyuki Serizawa

Department of Applied Chemistry

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

8 Citations (Scopus)

Abstract

Aluminum species forming in Lewis acidic chloroaluminate and bis(trifluoromethylsulfonyl)amide (TFSA^-) mixed ionic liquids having 1-butyl-3-methylimidazolium (BMI⁺) was investigated by potentiometry and Raman spectroscopy. A decrease in the concentration of [Al₂Cl₇]^- and an increase in that of [AlCl₄]^- with addition of BMITFSA into acidic BMICl-AlCl₃ were observed by Raman spectroscopy. The redox potential of Al(III)/Al in BMICl-AlCl₃ (1:2 in molar ratio) was found to be -0.68V vs. an Ag|Ag(I) reference electrode, which was corresponding to -0.25V vs. the ferrocene/ferrocenium couple at 25°C. The potentiometry of an Al electrode in the mixed ionic liquids with different compositions using the Ag|Ag(I) reference electrode suggested formation of a mixed ligand aluminum complex, Al(TFSA)Cl₂, indicating the instability of [Al₂Cl₇]^- against TFSA^-.

Original language	English
Pages (from-to)	42-45
Number of pages	4
Journal	Electrochemistry
Volume	86
Issue number	2
DOIs	https://doi.org/10.5796/electrochemistry.17-00077
Publication status	Published - 2018

Keywords

Aluminum speciation
Bis(trifluoromethylsulfonyl)amide ionic liquid
Lewis acidic chloroaluminate ionic liquid
Raman spectroscopy

ASJC Scopus subject areas

Electrochemistry

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10.5796/electrochemistry.17-00077

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title = "Electrochemical study on aluminum speciation in Lewis acidic chloroaluminate-bis(trifluoromethylsulfonyl)amide mixed ionic liquids",

abstract = "Aluminum species forming in Lewis acidic chloroaluminate and bis(trifluoromethylsulfonyl)amide (TFSA-) mixed ionic liquids having 1-butyl-3-methylimidazolium (BMI+) was investigated by potentiometry and Raman spectroscopy. A decrease in the concentration of [Al2Cl7]- and an increase in that of [AlCl4]- with addition of BMITFSA into acidic BMICl-AlCl3 were observed by Raman spectroscopy. The redox potential of Al(III)/Al in BMICl-AlCl3 (1:2 in molar ratio) was found to be -0.68V vs. an Ag|Ag(I) reference electrode, which was corresponding to -0.25V vs. the ferrocene/ferrocenium couple at 25°C. The potentiometry of an Al electrode in the mixed ionic liquids with different compositions using the Ag|Ag(I) reference electrode suggested formation of a mixed ligand aluminum complex, Al(TFSA)Cl2, indicating the instability of [Al2Cl7]- against TFSA-.",

keywords = "Aluminum speciation, Bis(trifluoromethylsulfonyl)amide ionic liquid, Lewis acidic chloroaluminate ionic liquid, Raman spectroscopy",

author = "Yasushi Katayama and Takumi Wakayama and Naoki Tachikawa and Kazuki Yoshii and Nobuyuki Serizawa",

year = "2018",

doi = "10.5796/electrochemistry.17-00077",

language = "English",

volume = "86",

pages = "42--45",

journal = "Electrochemistry",

issn = "1344-3542",

publisher = "Electrochemical Society of Japan",

number = "2",

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TY - JOUR

T1 - Electrochemical study on aluminum speciation in Lewis acidic chloroaluminate-bis(trifluoromethylsulfonyl)amide mixed ionic liquids

AU - Katayama, Yasushi

AU - Wakayama, Takumi

AU - Tachikawa, Naoki

AU - Yoshii, Kazuki

AU - Serizawa, Nobuyuki

PY - 2018

Y1 - 2018

N2 - Aluminum species forming in Lewis acidic chloroaluminate and bis(trifluoromethylsulfonyl)amide (TFSA-) mixed ionic liquids having 1-butyl-3-methylimidazolium (BMI+) was investigated by potentiometry and Raman spectroscopy. A decrease in the concentration of [Al2Cl7]- and an increase in that of [AlCl4]- with addition of BMITFSA into acidic BMICl-AlCl3 were observed by Raman spectroscopy. The redox potential of Al(III)/Al in BMICl-AlCl3 (1:2 in molar ratio) was found to be -0.68V vs. an Ag|Ag(I) reference electrode, which was corresponding to -0.25V vs. the ferrocene/ferrocenium couple at 25°C. The potentiometry of an Al electrode in the mixed ionic liquids with different compositions using the Ag|Ag(I) reference electrode suggested formation of a mixed ligand aluminum complex, Al(TFSA)Cl2, indicating the instability of [Al2Cl7]- against TFSA-.

AB - Aluminum species forming in Lewis acidic chloroaluminate and bis(trifluoromethylsulfonyl)amide (TFSA-) mixed ionic liquids having 1-butyl-3-methylimidazolium (BMI+) was investigated by potentiometry and Raman spectroscopy. A decrease in the concentration of [Al2Cl7]- and an increase in that of [AlCl4]- with addition of BMITFSA into acidic BMICl-AlCl3 were observed by Raman spectroscopy. The redox potential of Al(III)/Al in BMICl-AlCl3 (1:2 in molar ratio) was found to be -0.68V vs. an Ag|Ag(I) reference electrode, which was corresponding to -0.25V vs. the ferrocene/ferrocenium couple at 25°C. The potentiometry of an Al electrode in the mixed ionic liquids with different compositions using the Ag|Ag(I) reference electrode suggested formation of a mixed ligand aluminum complex, Al(TFSA)Cl2, indicating the instability of [Al2Cl7]- against TFSA-.

KW - Aluminum speciation

KW - Bis(trifluoromethylsulfonyl)amide ionic liquid

KW - Lewis acidic chloroaluminate ionic liquid

KW - Raman spectroscopy

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DO - 10.5796/electrochemistry.17-00077

M3 - Article

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VL - 86

SP - 42

EP - 45

JO - Electrochemistry

JF - Electrochemistry

SN - 1344-3542

IS - 2

ER -

Electrochemical study on aluminum speciation in Lewis acidic chloroaluminate-bis(trifluoromethylsulfonyl)amide mixed ionic liquids

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