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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
A phase variety of fluorinated ionic liquids: Molecular conformational and crystal polymorph
Hiroshi Abe1, Hiroaki Kishimura1, Mikio Uruichi2
1Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239-8686, Japan.
Abstract:
Crystal polymorphs of fluorinated ionic liquids (fILs) were examined at low-temperature (LT) by Raman spectroscopy. The fILs were 1-alkyl-3-methylimidazolium perfluorobutanesulfonate, [Cnmim][PFBS] (n = 4, 6, and 8). The cations and anion possess conformational degrees of freedom. Various LT phases were derived from the conformational polymorphs of the cations and the anion. Conformational flexibility depended on alkyl chain length. The crystal polymorphs in the fILs were sensitive to molecular conformations and flexibility.
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