The phase behaviour of 1-alkyl-3-methylimidazolium tetrafluoroborates; ionic liquids and ionic liquid crystals

J.D. Holbrey, K.R. Seddon

Research output: Contribution to journalArticle

1239 Citations (Scopus)

Abstract

Air- and water-stable 1-alkyl-3-methylimidazolium tetrafluoroborate salts with the general formula [C-mim][BF] (n = 0-18) have been prepared by metathesis from the corresponding chloride or bromide salts. The salts have been characterised by H NMR and IR spectroscopy, microanalysis, polarising optical microscopy and differential scanning calorimetry. Those with short alkyl chains (n = 2-10) are isotropic ionic liquids at room temperature and exhibit a wide liquid range, whereas the longer chain analogues are low melting mesomorphic crystalline solids which display an enantiotropic smectic A mesophase. The thermal range of the mesophase increases with increasing chain length and in the case of the longest chain salt prepared, [C-mim][BF], the mesophase range is ca. 150°C.
Original languageEnglish
Pages (from-to)2133-2139
Number of pages7
JournalJOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
Issue number13
DOIs
Publication statusPublished - 01 Jan 1999

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