Synthesis and physical properties of novel S‐shaped liquid crystal oligomers

Yoshizawa, Atsushi; Kasai, Hidenori; Ogasawara, Fumitaka; Nagashima, Yoshihiro; Kawaguchi, Tetsuya

doi:10.1080/13682820701261991

Cited by 16 publications

(3 citation statements)

References 22 publications

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“…Recently, we reported pronounced odd-even effects in the transition behavior of U-shaped systems [12]. Moreover, we have reported the synthesis and transition properties of S-shaped molecules in which two U-shaped mesogenic molecules are connected [13].…”

Section: Introductionmentioning

confidence: 96%

Molecular Organization of Preorganized S-Shaped Oligomers in the Liquid Crystalline Phases

Nagashima

Ogasawara

Yamamoto

et al. 2009

Molecular Crystals and Liquid Crystals

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We prepared a homologous series of S-shaped oligomers, 4,4 0 -bis(x-(2-(x-(4-(cyanophenyl)phenyloxy)alkyloxy)phenyloxy)alkyloxy)biphenyl [I-(m,n)], and investigated effects of the spacer length on the phase transition behavior. I-(7,7), I-(8,8), I-(9,9) and I-(7,9) showed nematic (N) and smectic A (SmA) phases, whereas I-(6,6) and I-(6,9) showed only an N phase. The melting behavior was found to depend on the parity of the spacer (m). The liquid-crystalline phases of I-(8,8) and I-(6,9) are monotropic, however, those of I-(9,9) and I-(7,9) are enantiotropic. X-ray diffraction measurements of I-(7,7), I-(8,8) and I-(7,9) indicate that the S-shaped oligomers exist as a close-packed structure in the monolayer SmA phase.

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Section: Introductionmentioning

confidence: 96%

Molecular Organization of Preorganized S-Shaped Oligomers in the Liquid Crystalline Phases

Nagashima

Ogasawara

Yamamoto

et al. 2009

Molecular Crystals and Liquid Crystals

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“…discotic liquid crystal. 5 However, there are many other categories such as cholesterol-based liquid crystal, H-shaped, 6 S-shaped, 7 star shaped liquid crystal 8 etc. Over a short period of our research on liquid crystal we have synthesized different type of thermotropic liquid crystals and characterized their unique properties with the help of POM, DSC and powdered XRD.…”

Section: Introduciotnmentioning

confidence: 99%

Playing with Liquid Crystals: A Short Review

Chakravorty¹,

Saha

2022

Orient. J. Chem

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The liquid crystal structure is a distinct phase of matter seen between crystalline and isotropic regions. There are many types of glossy liquids, depending on the composition. They have a different type of electronic device and display. As a result, development and integration of this type of extraordinary materials is required. Here, we have outlined the preparation route and properties of the different compounds which show this type of properties.

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“…Yoshizawa and Yamaguchi [14] have reported layered structure in the nematic phase consisting of U-shaped molecules. Recently Yoshizawa et al [15] have reported the synthesis and physical properties of novel S-shaped LC oligomers in which two U-shaped mesogenic molecules are connected. Yoshizawa et al [16] have also reported novel Y-shaped LC oligomers in which three mesogenic units are connected by 3,5-dihydroxybenzoic acid.…”

Section: Introductionmentioning

confidence: 99%

λ-Shaped azomesogens with polar chloro- and nitro-substituents

Prajapati¹,

Varia²

2010

Liquid Crystals

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A new homologous series of l-shaped mesogenic azo esters with polar chloro-and nitro-substituents has been synthesised by attaching a rigid 2-chloro-4-nitrophenylazo group to a resorcinol moiety by a central azo linkage. Both phenolic hydroxyl groups are esterified by 4-n-alkoxybenzoyl groups. All the compounds synthesised have been characterised using a combination of elemental analysis and standard spectroscopic methods. The mesomorphic properties of the compounds have been determined by polarising optical microscopy and differential scanning calorimetry. The lower members of the series are non-mesogenic, the middle members exhibit a nematic mesophase, and higher members exhibit a smectic A mesophase. The effect of polar chloro-, nitro-, and long lateral aromatic substituents, on mesomorphism is discussed.

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Synthesis and physical properties of novel S‐shaped liquid crystal oligomers

Cited by 16 publications

References 22 publications

Molecular Organization of Preorganized S-Shaped Oligomers in the Liquid Crystalline Phases

Molecular Organization of Preorganized S-Shaped Oligomers in the Liquid Crystalline Phases

Playing with Liquid Crystals: A Short Review

λ-Shaped azomesogens with polar chloro- and nitro-substituents

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