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Title: Electrochemical behavior of hexafluoroniobate, heptafluorotungstate, and oxotetrafluorovanadate anions in N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide room temperature ionic liquid
Authors: Kanatani, Takatsugu
Matsumoto, Kazuhiko  kyouindb  KAKEN_id
Nohira, Toshiyuki  kyouindb  KAKEN_id
Hagiwara, Rika  kyouindb  KAKEN_id
Author's alias: 萩原, 理加
Keywords: Ionic liquids
NbF_6[−]
VOF_4[−]
Diffusion coefficient
Stokes radius
Issue Date: Oct-2011
Publisher: Elsevier B.V.
Journal title: Journal of Fluorine Chemistry
Volume: 132
Issue: 10
Start page: 673
End page: 678
Abstract: Electrochemical behavior of hexafluoroniobate (Nb(V)F_6[−]), heptafluorotungstate (W(VI)F_7[−]), and oxotetrafluorovanadate (V(V)OF_4[−]) anions has been investigated in N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPyrTFSA) ionic liquid at 298 K by means of cyclic voltammetry and chronoamperometry. Cyclic voltammograms at a Pt electrode showed that Nb(V)F_6[−] anion is reduced to Nb(IV)F_6[2−] by a one-electron reversible reaction. Electrochemical reductions of W(VI)F_7[−] and V(V)OF_4[−] anions at a Pt electrode are quasi-reversible and irreversible reactions, respectively, according to cyclic voltammetry. The diffusion coefficients of Nb(V)F_6[−], W(VI)F_7[−] and V(V)OF_4[−] determined by chronoamperometry are 1.34 × 10[−7], 7.45 × 10[−8] and 2.49 × 10[−7] cm[2] s[−1], respectively. The Stokes radii of Nb(V)F_6[−], W(VI)F_7[−], and V(V)OF_4[−] in BMPyrTFSA have been calculated to be 0.23, 0.38, and 0.12 nm, from the diffusion coefficients and viscosities obtained.
Rights: © 2011 Elsevier B.V.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/148613
DOI(Published Version): 10.1016/j.jfluchem.2011.02.012
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