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High Pressure Research
An International Journal
Volume 31, 2011 - Issue 1
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Selected papers from the XLVIIIth European High Pressure Research Group (EHPRG 48) Meeting at Uppsala (Sweden), 25–29 July 2010

Pressure-induced phase transition of 1-butyl-3-methylimidazolium hexafluorophosphate [bmim][PF6]

Takahiro Takekiyo Department of Applied Chemistry, National Defense Academy, 1-10-20, Hashirimizu, 239-8686, Yokosuka, JapanCorrespondence[email protected]
,
Naohiro Hatano Department of Applied Chemistry, National Defense Academy, 1-10-20, Hashirimizu, 239-8686, Yokosuka, Japan
,
Yusuke Imai Department of Materials Science and Engineering, National Defense Academy, 1-10-20, Hashirimizu, 239-8686, Yokosuka, Japan
,
Hiroshi Abe Department of Materials Science and Engineering, National Defense Academy, 1-10-20, Hashirimizu, 239-8686, Yokosuka, Japan
&
Yukihiro Yoshimura Department of Applied Chemistry, National Defense Academy, 1-10-20, Hashirimizu, 239-8686, Yokosuka, Japan
Pages 35-38 | Received 21 Jul 2010, Accepted 01 Sep 2010, Published online: 19 Oct 2010
 
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Abstract

We have investigated the pressure-induced Raman spectral change of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) using Raman spectroscopy. The relative Raman intensity at 590 cm−1 of the CH2 rocking band assigned to the gauche conformer of the NCCC dihedral angle of the butyl group in the [bmim]+ cation increases when the pressure-induced liquid-crystalline phase transition occurs, while that at 610 cm−1 assigned to the trans conformer decreases. Our results show that the high-pressure phase transition of [bmim][PF6] causes the increase of the gauche conformer of the [bmim]+ cation.

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