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Issue 27, 2014
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Development of polar order and tilt in lamellar liquid crystalline phases of a bent-core mesogen

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Abstract

A new bent-core mesogen combining a 4-cyanoresorcinol unit with two terephthalate based rod-like wings and terminated by two long alkyl chains, was synthesized and investigated by DSC, XRD, optical, electrooptical and dielectric methods. A series of liquid crystalline phases in the unique sequence SmA–SmA(P)–SmCPR–(M1/SmCPα)–SmCsPA–SmCaPA–SmCaPA, mainly distinguished by the degree and mode of correlation of tilt and polar order, was observed. The development of polar order is associated with the emergence of a small tilt (<10°). With decreasing temperature the tilt changes from random (SmA) via synclinic to anticlinic, while the coherence length of the polar domains grows. This small tilt gives rise to an only weak layer coupling which is in competition with the polar coupling and this leads to new modes of self assembly in lamellar phases of bent-core mesogens, among them the SmCPR and the SmCPα phases. The SmCPR phase is an only slightly tilted biaxial smectic phase with randomized polar order and the SmCPα phase is a slightly tilted and antiferroelectric switching, but uniaxial smectic phase. For this phase a regular change of the in-plane polarization vector between the layers by an angle between >0° and <90° is proposed.

Graphical abstract: Development of polar order and tilt in lamellar liquid crystalline phases of a bent-core mesogen

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Supplementary files

Article information


Submitted
18 Mar 2014
Accepted
15 May 2014
First published
16 May 2014

This article is Open Access

Soft Matter, 2014,10, 5003-5016
Article type
Paper

Development of polar order and tilt in lamellar liquid crystalline phases of a bent-core mesogen

M. Alaasar, M. Prehm, M. Poppe, M. Nagaraj, J. K. Vij and C. Tschierske, Soft Matter, 2014, 10, 5003
DOI: 10.1039/C4SM00593G

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