Remarkable effect of a lateral substituent on the molecular ordering of chiral liquid crystal phases: A novel bromo-containing dichiralcompound showing SmC* variants

Takanishi, Yoichi; Nishiyama, Isa; Yamamoto, Jun; Ohtsuka, Youko; Iida, Atsuo

doi:10.1039/c0jm03081c

Cited by 13 publications

(4 citation statements)

References 21 publications

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“…Unfortunately, the resulting RXRD signal was extremely weak [29]. The results from recent RXRD investigations of a brominecontaining dichiral compound, by Y. Takanish et al [30] strengthened our previous conclusions [29] that the bromine atom in this French compound being located at the edge of the core part of the molecule was the main reason of the extremely weak RXRD signal.…”

Section: Two Key Experimental Probesmentioning

confidence: 53%

Liquid crystal mesophases beyond commensurate four-layer periodicity

Huang

Wang

Pan

et al. 2015

Liquid Crystals Reviews

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Current addressesFor more than one decade, SmC d4 *, SmC d3 *, and SmC A * were the only three confirmed commensurate SmC* variant phases with periodicities less than or equal four layers. In 2006, employing ellipsometry and resonant x-ray diffraction (RXRD), our research team first discovered a new liquid crystal mesophase having a six-layer periodicity in one ternary mixture which includes one sulfurcontaining compound. From our ellipsometric results, this phase showed antiferroelectric-like optical response. This novel discovery inspired renewed interest to search for liquid crystal mesophases with commensurate periodicities greater than four layers. Soon after, another mesophase having a six-layer structure and showing a ferrielectric-like dielectric response, instead, was uncovered by RXRD measurements on a different binary mixture which has one bromine-containing compound. Meanwhile mesophases having a 5-, 8-, 12-or 15-layer periodicity were reported. However, numerous questions remain to be addressed associated with these unusual reported phases. Theoretical models giving rise to mesophases with periodicities greater than 4 layers have been developed; but, to date, none of them have provided satisfactory explanations of all the physical phenomena related to the mesophases exhibiting a six-layer structure. Moreover, the question "what is the source of long-range interactions between liquidlike smectic layers, which are responsible for establishing mesophases with long periodicities and meanfield behavior of the SmA-SmC transition?" remains unanswered for more than three decades.

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Section: Two Key Experimental Probesmentioning

confidence: 53%

Liquid crystal mesophases beyond commensurate four-layer periodicity

Huang

Wang

Pan

et al. 2015

Liquid Crystals Reviews

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“…A hint may be contained in the fact that several subphases with long-range periodicity appear between chiral synclinic ferroelectric and anticlinic antiferroelectric phases [15], one theory of theirs is explained by the long-range interaction [16]. Actually, we also found the six-layer [17] and eight-layer [18] periodic structures without an electric field, and also a twelve-layer periodic one under the field application [19]. Since net polarization emerged by chirality is zero in the case of mixture with racemic MHPOBC, on the other hand, the long-range interaction due to a dopant will be weak or zero.…”

mentioning

confidence: 59%

Chiral doping effect in the B2 phase of a bent-core liquid crystal: The observation of resonant X-ray satellite peaks assigned to the 5/10 layer periodic structure

Takanishi¹,

Ohtsuka²,

Takahashi³

et al. 2015

EPL

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We studied the details of a local layer structure in the B2 phase of bromo-containing bent-core liquid crystals mixed with a small amount of chiral molecules using microbeam resonant X-ray scattering. In this measurement, we detected the 1 ± 0.2 order satellite peaks, which suggest that the B2 phase of the mixture has a long-range periodic structure. Dielectric and electro-optic measurements indicate almost the same behavior as the antiferroelectric SmCAPA(B2) of pure bromo-containing bent-core liquid crystals, so that the B2 phase of the chiral mixture is also antiferroelectric, and it is concluded that the B2 phase of the chiral mixture forms a ten-layer periodic structure. Such a long-range periodic structure did not appear by mixing the racemate of the same compounds, which indicates the chiral effect on the long-range periodic structure.

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“…The author and his coworkers also performed a new experiment using microbeam resonant X-ray scattering to determine the structure of the novel subpahse except qT = 1/3 and qT = 1/2. Here, we synthesized Br-containing chiral molecule, (S,S)-bis-[4 -(1-methylheptyloxycarbonyl)-4-biphenyl] 2-bromo-terephthalate (compound 1) [33], and measured RXS in the mixture of compound 1 and (S,S)-α, ω -bis (4-{[4 -(1-methylheptyloxycarbonyl)biphenyl-4-yl] oxycarbonyl}phenoxy)hexane [34]. The results are shown in Figure 10.…”

Section: Resonant X-ray Scattering and The Determination Of Molecular Arrangement Of Subphasesmentioning

confidence: 99%

Chiral Symmetry Breaking in Liquid Crystals: Appearance of Ferroelectricity and Antiferroelectricity

Takanishi

2020

Symmetry

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The study of chiral symmetry breaking in liquid crystals and the consequent emergence of ferroelectric and antiferroelectric phases is described. Furthermore, we show that the frustration between two phases induces a variety of structural phases called subphases and that resonant X-ray scattering is a powerful tool for the structural analysis of these complicated subphases. Finally, we discuss the future prospects for clarifying the origin of such successive phase transition.

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Remarkable effect of a lateral substituent on the molecular ordering of chiral liquid crystal phases: A novel bromo-containing dichiralcompound showing SmC* variants

Cited by 13 publications

References 21 publications

Liquid crystal mesophases beyond commensurate four-layer periodicity

Liquid crystal mesophases beyond commensurate four-layer periodicity

Chiral doping effect in the B2 phase of a bent-core liquid crystal: The observation of resonant X-ray satellite peaks assigned to the 5/10 layer periodic structure

Chiral Symmetry Breaking in Liquid Crystals: Appearance of Ferroelectricity and Antiferroelectricity

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