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New amphiphilic materials showing the lyotropic analogue to the thermotropic smectic C* liquid crystal phase

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Abstract

The recent discovery of a new lyotropic liquid crystal phase, the structure and properties of which are analogous to the chiral ferroelectric smectic C-phase (SmC*) in thermotropics, was based on a tailored amphiphile structure in which a tilt-promoting mesogenic core was linked to a chiral diol-headgroup via a hydrophilic ethylene glycol spacer [J. R. Bruckner et al., Angew. Chem., Int. Ed., 2013, 52, 8934–8937]. However, so far there is only one example of this general amphiphile structure known to form the new lyotropic SmC* phase in mixtures with water and with formamide. In an attempt to systematically elucidate the underlying structure–property relations we now report two new amphiphiles leading to lyotropic SmC* phases. These amphiphiles are derived from the parent amphiphile structure by (i) an elongation of the hydrophilic ethylene glycol spacer and (ii) an exchange of the original 2-phenylpyrimidine core by an even more tilt-promoting fluorenone core. Our investigations also reveal that the formation of the lyotropic SmC* phase is highly sensitive to exchanging or enlarging a building block of the primary material.

Graphical abstract: New amphiphilic materials showing the lyotropic analogue to the thermotropic smectic C* liquid crystal phase

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Publication details

The article was received on 09 May 2017, accepted on 15 Jun 2017 and first published on 23 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC02030A
Citation: J. Mater. Chem. C, 2017, Advance Article
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    New amphiphilic materials showing the lyotropic analogue to the thermotropic smectic C* liquid crystal phase

    M. D. Harjung, C. P. J. Schubert, F. Knecht, J. H. Porada, R. P. Lemieux and F. Giesselmann, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC02030A

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