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Polar structures of bent-core liquid crystals with tetrathiafulvalene units

, : Polar structures of bent-core liquid crystals with tetrathiafulvalene units. Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics 78(4 Pt 1): 041701-041701

We report on a series of three bent-core liquid crystals containing tetrathiafulvalene units. Their characterization consisted of electro-optical observations, second-harmonic generation (SHG) analysis, and x-ray diffraction measurements. Compound I exhibits a lamellar optically isotropic phase on cooling from the isotropic liquid and undergoes a nonreversible field-induced transition to a birefringent state. The two others present two-dimensional structural periodicities, being only compound II switchable. Additionally, the electron density maps of compounds II and III have been obtained based on the analysis of the x-ray diffraction intensities. According to SHG measurements the ground state is antiferroelectric in the three compounds. A quite good SHG performance is found in compounds I and II.

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Accession: 055034975

PMID: 18999439

DOI: 10.1103/PhysRevE.78.041701

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