Design, Synthesis and Physical Properties of New Liquid Crystal Materials Having a Fluoro-Substituted Tetrahydronaphthalene Structure for Active Matrix LCD

Kusumoto, Tetsuo; Saito, Yoshitaka; Nagashima, Yutaka; Negishi, Makoto; Takehara, Sadao; Iwashita, Yumi; Takeuchi, Kiyofumi; Takatsu, Haruyoshi; Pithart, Corneria; Frings, R.B.; Lachowicz, Artur; Grahe, Gerwald

doi:10.1080/15421400490434973

Cited by 9 publications

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“…That fluorine reduces the threshold voltage. [1][2][3][4] Supermolecular liquid crystalline materials have attracted much attention from the perspective of design of a self-organizing system. 5,6 Many kinds of dimeric and trimeric mesogenic molecules have been reported.…”

Section: Introductionmentioning

confidence: 99%

Novel U-shaped liquid crystals for electro-optic devices

et al. 2006

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We would like to report here novel molecular design for electro-optic liquid crystal devices, i.e. catechol derivatives for reduction in threshold voltage and binaphthyl derivatives for blue phases with a wide temperature range. A threshold voltage of a nematic mixture consisting of a host liquid crystal and 10wt% of a catechol derivative, 1-{6-(3,4-difluorophenyloxy)hexyloxy}-2-{6-[4-(4-fluorophenyl)phenyloxy]hexyloxy}benzene, was markedly lower than that of the host LC. The U-shaped compound was found to induce larger dielectric anisotropy in the nematic phase of the mixture than the corresponding monomeric compound. Then, we prepared a homologous series of novel chiral dimeric compounds, (R)-2,2'-bis{6-[4-(2-(2-fluoro-4-butyloxyphenyl)pyrimidine-5-yl)phenyloxy]alkyloxy}-1,1'-binaphthyl. The binaphthyl derivatives with an even number of atoms in the spacers showed a chiral nematic phase, however, those with an odd number of atoms showed a blue phase in a relatively wide temperature range between the isotropic and smectic A phases. We discuss structure-property relationships in the U-shaped system.

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Section: Introductionmentioning

confidence: 99%

Novel U-shaped liquid crystals for electro-optic devices

et al. 2006

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“…Thus, the general molecular design for the liquid crystalline materials of TFT LCDs introduces fluorine atoms as a polar group. [17][18][19][20][21][22][23] We have recently found that a U-shaped compound possessing terminal fluoro groups enhances dielectric anisotropy and reduces threshold voltage (see Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Physical Properties of Novel Fluorine-Containing U-Shaped Compounds

Ogasawara¹,

Uchida

Yoshizawa

2007

jjap

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We prepared a homologous series of novel fluorine-containing U-shaped mesogenic compounds and investigated the electrooptical properties of a mixture with a nematic liquid crystal for an optically compensated bend (OCB) mode liquid crystal display. A U-shaped compound, 1,2-bis[6-(3,4,5-trifluorophenyloxy)hexyloxy]benzene, was found to enhance the dielectric anisotropy of the mixture. A critical voltage (V CR ) at a splay to bend transition of a nematic mixture consisting of a host liquid crystal and 5 wt % U-shaped compound was found to be lower than that of the host liquid crystal. We discuss the effects of the molecular structure of the U-shaped compounds on the electrooptical properties of the mixture.

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“…A compound possessing a polar group, such as −CN, decreases the VHR. Thus, the general molecular design for liquid crystalline materials introduces fluorine atoms at a ring, a side chain, or a linkage group of a liquid crystalline compound on the basis of the prediction from molecular modeling of electrooptical properties that fluorine reduces the threshold voltage. − Supermolecular liquid crystalline materials have attracted much attention from the perspective of design of a self-organizing system . Many kinds of dimeric and trimeric mesogenic molecules have been reported. , Coles et al reported the phase transition behavior and electrooptical properties of siloxane bimesogenic liquid crystals. − We have reported novel preorganized systems, e.g., U-shaped molecules, binaphthyl derivatives, and λ-shaped molecules .…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the general molecular design for liquid crystalline materials introduces fluorine atoms at a ring, a side chain, or a linkage group of a liquid crystalline compound on the basis of the prediction from molecular modeling of electrooptical properties that fluorine reduces the threshold voltage. [1][2][3][4][5] Supermolecular liquid crystalline materials have attracted much attention from the perspective of design of a self-organizing system. 6 Many kinds of dimeric and trimeric mesogenic molecules have been reported.…”

Section: Introductionmentioning

confidence: 99%

Preorganization Effect of a Polar Supermolecule on Dielectric Anisotropy in a Nematic Liquid Crystalline Phase

2005

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We have prepared novel preorganized compounds in which 4-(4-fluorophenyl)phenyl and 4-(trifluoromethoxy)phenyl are connected via a rigid catechol unit or a flexible spacer and investigated their structural effects on the induced dielectric anisotropy in the mixture with a host material. The nonsymmetric bimesogenic compounds with the flexible spacer were found to be a dopant with negative dielectric anisotropy in host A composed of fluoro-substituted phenyl esters, whereas they were found to be a dopant with large positive dielectric anisotropy in host B (6OCB). The rigid U-shaped compound enhanced Δε in both hosts A and B. We discuss effects of host−guest interaction on conformational change of the guest molecule in the nematic liquid crystalline phase.

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Design, Synthesis and Physical Properties of New Liquid Crystal Materials Having a Fluoro-Substituted Tetrahydronaphthalene Structure for Active Matrix LCD

Cited by 9 publications

References 0 publications

Novel U-shaped liquid crystals for electro-optic devices

Novel U-shaped liquid crystals for electro-optic devices

Synthesis and Physical Properties of Novel Fluorine-Containing U-Shaped Compounds

Preorganization Effect of a Polar Supermolecule on Dielectric Anisotropy in a Nematic Liquid Crystalline Phase

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