Structure and Polymorphism of Biaxial Bent–Core Smectic Liquid Crystal

S. Sreenilayam School of Electronic & Communication Engineering, Dublin Institute of Technology, Dublin, Ireland

M. Nagaraj Department of Electronic and Electrical Engineering, Trinity College Dublin, Dublin 2, Ireland

Y. P. Panarin Department of Electronic and Electrical Engineering, Trinity College Dublin, Dublin 2, Ireland; School of Electronic & Communication Engineering, Dublin Institute of Technology, Dublin, Ireland

J. K. Vij Department of Electronic and Electrical Engineering, Trinity College Dublin, Dublin 2, Ireland

A. Lehmann Institute of Chemistry, Organic Chemistry, Martin Luther-University Halle-Wittenberg, D 06120, Germany

C. Tschierske Institute of Chemistry, Organic Chemistry, Martin Luther-University Halle-Wittenberg, D 06120, Germany

Abstract

The mesomorphic properties of a homologous series of achiral bent-core compounds are studied by polarizing optical microscopy, electro-optics and polarization measurements. Induction of a new orthogonal smectic phases with the increase of alkyl side chain length was observed. One of the compounds exhibits a unique phase transition between four non-tilted smectic phases (SmAP_A–SmAP_AR-SmAP_R-SmA). The uniaxial but antiferroelectric nature of SmAP_AR phase was confirmed by POM, current response, the 2nd harmonic electro-optic response and polarization measurements. The structure of SmAP_AR phase was studied theoretically by Next-Nearest-Neighbor model and was identified as SmAP_α.

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Acknowledgment

The authors thank the EU Grant No. FP7-216025 BIND and SFI Grant No. RFP 06/RFP/ENE039 for funding this work.

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Structure and Polymorphism of Biaxial Bent–Core Smectic Liquid Crystal

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Structure and Polymorphism of Biaxial Bent–Core Smectic Liquid Crystal

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