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Ionic liquid crystals: hexafluorophosphate salts

Gordon, C.M. and Holbrey, J.D. and Kennedy, A.R. and Seddon, K.R. (1998) Ionic liquid crystals: hexafluorophosphate salts. Journal of Materials Chemistry, 8 (12). pp. 2627-2636. ISSN 0959-9428

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Abstract

A series of novel hexafluorophosphate salts, based on N,N¾-dialkylimidazolium and substituted N-alkylpyridinium cations, display liquid crystalline behaviour at temperatures above their melting point. The temperature range over which liquid crystalline behaviour is observed increases markedly with increasing alkyl chain length. Alkyl substitution at the 3- and 4-positions on the pyridinium ring results in a decrease in the melting point compared with the equivalent unsubstituted salt, but also leads to a large decrease in the tendency towards liquid crystalline behaviour (or mesogenicity). The salts prepared are fully characterised using a wide variety of techniques, including NMR and IR spectroscopy, DSC, and single crystal X-ray diffraction in the case of 1-dodecyl-3-methylimidazolium hexafluorophosphate. The effect of preparing mixtures containing different proportions of two cations is also reported.

Item type: Article
ID code: 1303
Keywords: hexafluorophosphate salts, dialkylimidazolium, crystalline, mesogenicity, NMR, IR, spectroscopy, Chemistry, Materials Chemistry, Chemistry(all)
Subjects: Science > Chemistry
Department: Faculty of Science > Pure and Applied Chemistry
Related URLs:
    Depositing user: Catriona Mccallum
    Date Deposited: 26 Jun 2006
    Last modified: 04 Sep 2014 10:01
    URI: http://strathprints.strath.ac.uk/id/eprint/1303

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