Long-alkyl-chain-derivatized imidazolium salts and ionic liquid crystals with tailor-made properties

A series of new 1,3-dialkylimidazolium salts with the general formula [C n C n IM][A] (for n = 12; A = PF 6 − , OTf − , NTf 2 − ; for n = 10, 14, 16, and 18; A = BF 4 − , ClO 4 − ) has been synthesized. The [C 12 C 12 IM][A] salts are ionic liquids at room temperature, whereas all [C n C n IM][BF 4...

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Bibliographic Details
Published in:RSC advances 2014, Vol.4 (24), p.12476-12481
Main Authors: Wang, Xinjiao, Sternberg, Michelle, Kohler, Florian T. U., Melcher, Berthold U., Wasserscheid, Peter, Meyer, Karsten
Format: Article
Language:English
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Summary:A series of new 1,3-dialkylimidazolium salts with the general formula [C n C n IM][A] (for n = 12; A = PF 6 − , OTf − , NTf 2 − ; for n = 10, 14, 16, and 18; A = BF 4 − , ClO 4 − ) has been synthesized. The [C 12 C 12 IM][A] salts are ionic liquids at room temperature, whereas all [C n C n IM][BF 4 ] and [C n C n IM][ClO 4 ] ( n = 10, 14, 16, 18) salts demonstrate a liquid crystalline phase at elevated temperatures that have a large mesophase window, which varies from 10 to 80 °C with increasing alkyl chain length. In particular, [C 10 C 10 IM][BF 4 ] shows liquid crystalline behavior at room temperature and therefore is potentially suitable for application as a pre-organized reaction medium in synthesis and catalysis. Viscosity studies of [C 16 C 16 IM][BF 4 ] and the corresponding perchlorate salt demonstrate strong non-Newtonian viscosity behavior for the liquid crystalline state of these ionic liquids.
ISSN:2046-2069
2046-2069
DOI:10.1039/C3RA47250G