- Core-to-core dimers forming switchable mesophase
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We report structurally new type of dimers composed of bent-core molecules connected through their central cores by an alkylene spacer. Various self-assembling structures are discovered when prolonging the terminal alkyl chains in arms. Among diverse mesop
- Hor?ic,Svoboda,Novotná,Pociecha,Gorecka
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supporting information
p. 2721 - 2724
(2017/03/10)
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- Synthesis and characterization of symmetrical eight aromatic ring containing bent-shaped material derived from benzophenone
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A new family of symmetrical eight aromatic ring-containing bent-shaped mesogens in which the central elbow is a ketone has been synthesized and characterized. The effect of the side chain on the mesomorphism has been studied. All the bent derivatives were found to exhibit mesomorphism. The higher homologues of the series exhibit the B1 phase and the lower homologues of the series show the B6 phase. Copyright Taylor & Francis Group, LLC.
- Majumdar,Ghosh,Chakravorty
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- Chiral smectic *C mesogens having ester and amide central linkages
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Ten members of a chiral homologous series 4-(4'-n-alkoxy benzoyloxy benzoyl)4''- S- (+) 2-methyl butoxy anilides were synthesized in multiple step synthesis. Series exhibits chiral smectic *C and cholesteric mesophases. In this series, n-propyl to n-dodecyl derivatives exhibit smectic *C and cholesteric mesophases. n-Tetradecyl and n-hexadecyl derivatives exhibit only smectic *C phases. The plot of transition temperatures versus number of carbon atoms in alkoxy chain exhibits odd-even effect for cholestric-isotropic transition temperatures. The effect of amide linkage and chirality is discussed in detail. High-temperature cholestric phases exhibit vivid colors. Two compounds were analyzed by calorimetric study (C12 and C14) to confirm the transition temperatures of which was observed under polarizing microscope. The mesogenic behavior of the series compared with other series where amide central linkage differs in its position. The mesogenic thermal stability is compared with other related homologous series. The result indicates that amide linkage enhances smectic as well as cholesteric thermal stability but enhancement in smectic phase is much higher. Compounds are characterized by elemental analysis, IR spectral data, Mass spectral data, DSC, NMR, and microscopic study.
- Tandel,Vora
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p. 103 - 116
(2008/09/20)
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- SYNTHESIS AND LIQUID CRYSTAL PROPERTIES OF SUBSTITUTED 5-(ARYLCARBONYLOXY)-2-(p-CYANOPHENYL)PYRIMIDINES
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Liquid crystal p-substituted benzoates, biphenylcarboxylates, and benzoyloxybenzoates were obtained on the basis of 5-hydroxy-2-(p-cyanophenyl)pyrimidine.The development of nematogenicity by the esters due to the p-cyanophenyl grouping was noted, and the appearance of the smectic mesophase by the variation of the ring framework of the acid fragment of the molecule was investigated.
- Mikhaleva, M. A.,Igonina, G. A.,Savel'ev, V. A.
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p. 320 - 325
(2007/10/03)
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- SYNTHESIS AND LIQUID CRYSTALLINE PROPERTIES OF 2-SUBSTITUTED (5-PYRIMIDINYL) BENZOATES AND BENZOYLOXYBENZOATES
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2-Substituted (5-pyrimidinyl) benzoates and benzoyloxybenzoates have been synthesized and their liquid crystalline properties have been studied.In general, these compounds exhibit a characteristic tendency to form a smectic mesophase.
- Kizner, T. A.,Mikhaleva, M. A.,Serebryakova, E. S.
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p. 313 - 315
(2007/10/02)
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