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Issue 24, 2014
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Long-alkyl-chain-derivatized imidazolium salts and ionic liquid crystals with tailor-made properties

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Abstract

A series of new 1,3-dialkylimidazolium salts with the general formula [CnCnIM][A] (for n = 12; A = PF6, OTf, NTf2; for n = 10, 14, 16, and 18; A = BF4, ClO4) has been synthesized. The [C12C12IM][A] salts are ionic liquids at room temperature, whereas all [CnCnIM][BF4] and [CnCnIM][ClO4] (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, [C10C10IM][BF4] 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 [C16C16IM][BF4] and the corresponding perchlorate salt demonstrate strong non-Newtonian viscosity behavior for the liquid crystalline state of these ionic liquids.

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

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Supplementary files

Article information


Submitted
03 Dec 2013
Accepted
12 Feb 2014
First published
19 Feb 2014

This article is Open Access

RSC Adv., 2014,4, 12476-12481
Article type
Paper
Author version available

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

X. Wang, M. Sternberg, F. T. U. Kohler, B. U. Melcher, P. Wasserscheid and K. Meyer, RSC Adv., 2014, 4, 12476
DOI: 10.1039/C3RA47250G

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