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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 (SmAPA–SmAPAR-SmAPR-SmA). The uniaxial but antiferroelectric nature of SmAPAR phase was conﬁrmed by POM, current response, the 2nd harmonic electro-optic response and polarization measurements. The structure of SmAPAR phase was studied theoretically by Next-Nearest-Neighbor model and was identiﬁed as SmAPα.
Lehmann, A. et al. (2012). Structure and polymorphism of biaxial bent-core smectic liquid crystal. Molecular Crystals and Liquid Crystals , vol. 553, pp. 133-139. DOI:10.1080/15421406.2011.609453