Date

Place

Room H (Room Hall 1, 1F)
P1. Poster Session I
August 20, 2015 (Thursday)
14:00 ~ 15:30

[P1-80]
14:00 ~ 15:30
Title:Synthesis and Electronic/Optical Properties of Dimesogenic Asymmetric Bent-Core Molecules
Sa-Wook Kim, Hak-Kyu Kim (Kumoh Nat'l Inst. of Tech., Korea), Hak-Rin Kim (Kyungpook Nat'l Univ., Korea), and E-Joon Choi (Kumoh Nat'l Inst. of Tech., Korea)
Abstract: Bent-core liquid crystal molecules with C2V molecular symmetrycan reveal a spontaneous polarization without a chiral carbon. These molecules can show polar smectic phases, so-called B-phases. Thereforethey may represent the polar switching phenomenon.In this study, we have synthesized six dimesogeniccompoundswhich containtwo asymmetric bent-coremesogenswith 3,4,5- and 2,4,6-trifluoro substituents in the terminal benzene ring(Ar = 3,4,5- and 2,4,6-trifluorophenyl groups); andhave 5, 6 and 12 carbons in the flexible alkyl spacer(n = 5, 6 and 12). The structures of compounds were identified by FT-IR and 1H-NMR spectroscopy. The purity of compounds was confirmed by thin layer chromatography and elementary analysis. Their mesomorphic properties and phase behavior were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), X-ray diffraction (XRD) and electro-optical (E/O) measurements.Four compounds(Ar=2,4,6-trifluorophenyl group/n = 6; Ar = 3,4,5-trifluorophenyl group/n = 5, 6 and 12)formed anenantiotropicnematicmesophase, whileone compound (Ar = 2,4,6-trifluorophenyl group/n = 12)formed a monotropicnematicmesophase. However, a remaining compound (Ar = 2,4,6-trifluorophenyl group/n = 3) was non-liquid crystalline.
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