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Issue 5, 2012
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Regulating mesogenic properties of ionic liquid crystals by preparing binary or multi-component systems

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Abstract

In this study, a series of binary systems based ionic liquid crystals (ILCs) C12MIm(BF4)yIx (x + y = 1) are prepared by mixing ILCs 1-dodecyl-3-methylimidazolium iodide (C12MImI) and 1-dodecyl-3-methylimidazolium tetrafluoroborate (C12MImBF4), aiming to combine the properties of both C12MImBF4 and C12MImI. Their mesogenic properties are characterized by thermal analysis, polarized optical microscopy, X-ray diffraction as well as anisotropic ionic conductivity measurements. It is found that the smectic A phase with interdigitated bilayer structure is observed in the C12MIm(BF4)yIx series. The binary system C12MIm(BF4)yIx has a larger mesophase temperature range and interdigitated layer spacing than pure C12MImBF4. And the anisotropic ionic conductivity of the binary system, including parallel and perpendicular to smectic layer, is higher than pure C12MImI. Moreover, in binary system C12MIm(BF4)yIx, with the increasing content of C12MImI the ability of the anion to form three dimensional hydrogen bonds increases, resulting in the increase of the mesophase temperature range, interdigitated layer spacing and the decrease of anisotropic ionic conductivity. Furthermore, multi-component system based ILCs are obtained by introducing iodine to the binary system, and the mesophase temperature range is lowered, which is associated with the weak ability of I3 to form hydrogen bond with cations. All these results suggest that we can regulate the mesogenic properties of ILCs as we need by making binary or even multi-component systems.

Graphical abstract: Regulating mesogenic properties of ionic liquid crystals by preparing binary or multi-component systems

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Publication details

The article was received on 26 Sep 2011, accepted on 03 Nov 2011 and first published on 12 Dec 2011


Article type: Paper
DOI: 10.1039/C1JM14790K
Citation: J. Mater. Chem., 2012,22, 2299-2305
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    Regulating mesogenic properties of ionic liquid crystals by preparing binary or multi-component systems

    M. Wang, X. Pan, S. Xiao, C. Zhang, W. Li and S. Dai, J. Mater. Chem., 2012, 22, 2299
    DOI: 10.1039/C1JM14790K

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