110560-01-5Relevant academic research and scientific papers
The effect of the octan-3-yloxy and the octan-2-yloxy chiral moieties on the mesomorphic properties of ferroelectric liquid crystals
W?g?owska, Dorota,Perkowski, Pawe?,Piecek, Wiktor,Mrukiewicz, Mateusz,D?browski, Roman
, p. 81003 - 81012 (2015/10/12)
New mesogenic compounds exhibiting unique, so called orthoconic, behavior at the synclinic smectic SmC? phase have been obtained. The newly synthesized compounds belong to two chiral homologous series: 4′-[ω-(2,2,3,3,4,4,4-heptafluorobutoxy)alkoxy]bipheny
Novel asymmetrical single- and double-chiral liquid crystal diads with wide blue phase ranges
Wei, Chong-Lun,Chen, Te-Cheng,Raghunath, Putikam,Lin, Ming-Chang,Lin, Hong-Cheu
, p. 4615 - 4622 (2015/02/19)
In this study, two series of novel asymmetrical single- and double-chiral liquid crystal diads using a central linker to link two different mesogenic cores were successfully synthesized. The effects of the position of chiral centers and the number of aromatic rings on the mesomorphic and electro-optical properties were investigated. We found that diads III-N (where N = A, B, C and D) have better mesophasic properties than II-N (where N = A, B, C, D and E). Compared with III-C with a chiral center at the terminal alkoxyl chain, diad III-D exhibited the widest temperature range of BPI (ca. 31°C) as the chiral center was introduced to the central linker. Besides III-D, BPs were also observed in diads II-B and III-B with a chiral center at the central spacer. According to our experimental results and molecular modeling, the mesomorphic properties and temperature ranges of BPs will be affected by the values of biaxiality and dipole moment, along with the bent shape of molecular geometry. Therefore, we demonstrated the first example of asymmetrical single- and double-chiral liquid crystal diads involved chiral centers located at the central linker to exhibit BPs, including the mesophases of BPI and BPIII, which might offer new BP single-components to the future applications of eutectic liquid crystal mixtures with wide BP ranges.
Flexible H-bonded liquid-crystals with wide enantiotropic blue phases
He, Wan-Li,Wei, Mei-Ju,Yang, Huai,Yang, Zhou,Cao, Hui,Wang, Dong
, p. 5622 - 5626 (2014/03/21)
Novel cinnamic-acid-derived H-bonded liquid crystals with enantiotropic BP*s were facilely prepared. When simply modifying the donor-acceptor ratio, the proportion of (S)-4-(2-octanyloxy) cinnamic acid to 4-(4-propylcyclohexyl) phenyl isonicotinate, the g
Hierarchical superstructures with control of helicity from the self-assembly of chiral bent-core molecules
Lin, Shih-Chieh,Ho, Rong-Ming,Chang, Chin-Yen,Hsu, Chain-Shu
supporting information; experimental part, p. 9091 - 9098 (2012/10/08)
Herein, two asymmetric chiral bent-core molecules, 3-[(4-{[4-(heptyloxy) benzoyl]oxy}benzoyl)oxy]-phenyl-4-[(4-{[(1R)-1-methylheptyl]oxy}benzoyl)oxy] benzoate (BC7R) and 3-[(4-{[4-(heptyloxy)benzoyl]oxy}benzoyl)oxy]-phenyl-4-[(4- {[(1S)-1-methylheptyl]oxy}benzoyl)oxy] benzoate (BC7S), were synthesized to demonstrate control of the helicity of their self-assembled hierarchical superstructures. Mirror-imaged CD spectra showed a split-type Cotton effect after the formation of self-assembled aggregates of BC7R and BC7S, thereby suggesting the formation of intermolecular exciton couplets with opposite optical activities. Both twisted and helical ribbons with preferential helicity that corresponded to the twisting character of the intermolecular exciton couplet were found in the aggregates. The formation of helical ribbons was attributed to the merging of twisted ribbons through an increase in width to improve morphological stability. As a result, control of the helicity of hierarchical superstructures from the self-assembly of bent-core molecules could be achieved by taking advantage of the transfer of chiral information from the molecular level onto the hierarchical scale.
Thermally, photochemically and electrically switchable reflection colors from self-organized chiral bent-core liquid crystals
Mathews, Manoj,Zola, Rafael S.,Yang, Deng-Ke,Li, Quan
scheme or table, p. 2098 - 2103 (2011/10/09)
We report the synthesis and characterization of two new chiral 1,3-phenylene based five ring bent-core mesogens that combine the unique electro-optic characteristics of banana-shaped molecules with chiroptic properties. Azobenzene moiety incorporated as a
Fluoro- and nitro-substitution effect of some chiral compounds
Guo, Yongmin,Bi, Lifeng,Li, Baozong,Yang, Yonggang,Wen, Jianxun
scheme or table, p. 65 - 70 (2010/04/02)
Four chiral compounds have been synthesized. Their phase transition behavior was investigated by differential scanning calorimetry and polarized optical microscopy. Two of them show monotropic smectic C* phases. Moreover, one of them shows an enantiotropic blue phase. The lateral fluoro-substitution strongly suppressed the formation of SmC* phases and decreased clearing points. Although the introduction of nitro group in the core decreased the length-diameter ratio, the temperature range of monotropic SmC* phase did not change much.
Liquid crystalline properties of unsymmetrical bent-core compounds containing chiral moieties
Reddy, R. Amaranatha,Sadashiva,Baumeister
, p. 3303 - 3316 (2007/10/03)
The synthesis, characterization and mesomorphic properties of new unsymmetrical bent-core compounds containing chiral moieties are reported. These compounds have been derived from either 3-hydroxybenzoic acid or 2,7-dihydroxynaphthalene as the central unit. The chiral group is incorporated either within the bent-core structure as a linking group or is appended in the terminal position. The influence of the position of the chiral moiety on the mesomorphic properties has been investigated. The bent-core compounds containing a chiral group (octan-2-ol) in the terminal chain exhibit a direct transition from chiral calamitic phases such as SmC*, SmC*γ to a polar banana phase with a two-dimensional lattice (ColobP A*) on decreasing temperature. In order to prove this phase sequence, the corresponding compound with a racemic octan-2-ol group at the terminal chain has been synthesized. The preliminary observations and investigations are presented for comparison with the chiral compound. Possible explanations for this unusual phase sequence and the models for the Col obPA* (SmCsPA*) phase are also discussed on the basis of X-ray and electric field experiments. The Royal Society of Chemistry 2005.
Liquid crystal compounds, mixtures and devices
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Page column 9, (2008/06/13)
An electroclinic device having two spaced cell walls each bearing electrode structures and treated on at least one facing surface with an alignment layer, a layer of a smectic liquid crystal material enclosed between the cell walls, where the liquid crystal material contains one or more of the compounds described by formula I as defined in the specification.
New chiral series with large tilt angle in the ferroelectric smectic phase
Cluzeau,Ismaili,Anakkar,Foulon,Babeau,Nguyen
, p. 185 - 202 (2007/10/03)
A new series of chiral homologous thiobenzoates with aliphatic end chains ranging from heptyloxy to dodecyloxy has been synthesized. It has been characterized by optical microscopy, DSC, pitch measurements and electro-optical study. The typical phase sequ
Liquid crystal compounds, mixtures and devices
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, (2008/06/13)
An electoclinic device having two spaced cell walls each bearing electrode structures and treated on at least one facing surface with an alignment layer, a layer of a smectic liquid crystal material enclosed between the cell walls, where the liquid crystal material contains one or more of the compounds described by formula I as defined in the specification.
