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Issue 19, 2011
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Ionic liquid crystals of quaternary ammonium salts with a 2-hydroxypropoxy insertion group

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Abstract

A 2-hydroxypropoxy group was inserted at the junction between the headgroup and the alkyl chain of quaternary ammonium salts. This group promotes a bent configuration for the alkyl chain relative to the ammonium headgroup, as compared to those without the 2-hydroxypropoxy group. At the same time, the insertion of this group weakens the N+–X ionic interactions and hydrogen bonding interactions within the ionic layers and, therefore, allows the compounds to have a wide temperature range of mesophase. The molecular structures were determined by single crystal X-ray diffraction, in order to have a better understanding of the influence of the 2-hydroxypropoxy group on the packing arrangement and the mesomorphic properties. Their mesomorphic properties were investigated by differential scanning calorimetry, polarizing optical microscopy, X-ray powder diffraction and rheological measurements. It's important to note that anions have a profound effect on the phase properties of these liquid-crystalline compounds, such as phase transition temperatures, crystallisation rate, layer spacing and structural strength.

Graphical abstract: Ionic liquid crystals of quaternary ammonium salts with a 2-hydroxypropoxy insertion group

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Publication details

The article was received on 16 Jan 2011, accepted on 11 Mar 2011 and first published on 06 Apr 2011


Article type: Paper
DOI: 10.1039/C1JM10236B
J. Mater. Chem., 2011,21, 6875-6882

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    Ionic liquid crystals of quaternary ammonium salts with a 2-hydroxypropoxy insertion group

    Z. Wei, X. Wei, X. Wang, Z. Wang and J. Liu, J. Mater. Chem., 2011, 21, 6875
    DOI: 10.1039/C1JM10236B

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