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Title: Effects of the polyfluoroalkyl side-chain on the properties of 1-methyl-3-polyfluoroalkylimidazolium fluorohydrogenate ionic liquids
Authors: Taniki, Ryosuke
Kenmochi, Naoki
Matsumoto, Kazuhiko  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-0770-9210 (unconfirmed)
Hagiwara, Rika  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-7234-3980 (unconfirmed)
Author's alias: 松本, 一彦
Keywords: Ionic liquid
Imidazolium
Fluorohydrogenate
Polyfluoroalkyl
Liquid crystal
Issue Date: May-2013
Publisher: Elsevier B.V.
Journal title: Journal of Fluorine Chemistry
Volume: 149
Start page: 112
End page: 118
Abstract: A series of 1-methyl-3-polyfluoroalkylimidazolium fluorohydrogenate salts (C_[3F3]MIm(FH)_[1.7]F, C_[4F5]MIm(FH)_[1.7]F, C_[6F9]MIm(FH)_[1.8]F, C_[8F13]MIm(FH)_[2.0]F, and C_[10F17]MIm(FH)_[2.0]F; the subscript numbers denote the number of carbon and fluorine atoms in the side-chain, respectively, with which the two carbon atoms from the root of the side-chain are not fluorinated) were synthesized and their physicochemical properties, including decomposition temperature, phase transition temperature, density, viscosity, ionic conductivity, and electrochemical stability, were measured. The three salts with relatively short side-chain have melting points below room temperature: C_[3F3]MIm(FH)_[1.7]F (Tm: 274 K), C_[4F5]MIm(FH)_[1.7]F (Tg: 186 K), and C_[6F9]MIm(FH)_[1.8]F (Tm: 276 K). The other salts, C_[8F13]MIm(FH)_[2.0]F and C_[10F17]MIm(FH)_[2.0]F, are in the crystal phase at room temperature. The obtained salts are miscible with water and hydrophobic fluorohydrogenate ionic liquids were not obtained in the present series. Introduction of fluorine atoms results in the increase in the density and viscosity, decrease in the ionic conductivity, and decrease in electrochemical stability against reduction. The liquid crystal phase was observed for C_[8F13]MIm(FH)_[2.0]F and C_[10F17]MIm(FH)_[2.0]F according to polarized optical microscopy and X-ray diffraction analysis.
Rights: © 2013 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/2433/173338
DOI(Published Version): 10.1016/j.jfluchem.2013.02.004
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