Physical properties of diphenyldiacetylenic liquid crystals

Wu, Shin‐Tson; Finkenzeller, U.; Reiffenrath, Volker

doi:10.1063/1.343275

Cited by 70 publications

(9 citation statements)

References 11 publications

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“…Wu and co-workers [6,7] reported that butadiynes with asymmetric tails offer compounds with low melting points and broad nematic ranges. We wish to synthesize diphenyl-substituted butadiynes which have only one tail as the structure (9) which contains a 2,3,5,6-tetrafluorophenylene in the core part.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Mesogenic Properties of 1-Phenyl-4-(4-n-Alkoxyphenyl-2,3,5,6-Tetrafluorophenyl)-Butadiynes

Chen

Wen

1996

Molecular Crystals and Liquid Crystals Science and Technology.

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Three series of 1,4-disubstituted butadiynes containing a tetrafluorophenylene in core structure have been synthesized from 1-pentafluorophenyl-2-trimethylsilyacetylene. The results showed that l-phenyl-4-(4-n-alkoxyphenyl-2,3,5,6-tetrafluorophenyl)-b~tadiynes were nematic liquid crystals. However, l-phenyl-4-(4-n-alkoxy-2,3,5,6-tetrafluoro-phenyl)-butadiynes and l-(Cnitrophenyl)-4-(4-n-alkoxy-2,3,5,6-tetrafluorophyeny~)-butadiynes did not exhibit any liquid crystallinity. The IR spectra showed that the l-phenyl-4-(4-n-alkoxyphenyl-2,3,5,6-tetrafluor0-pheny1)-butadiynes were good liquid crystals for IR modulator.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Mesogenic Properties of 1-Phenyl-4-(4-n-Alkoxyphenyl-2,3,5,6-Tetrafluorophenyl)-Butadiynes

Chen

Wen

1996

Molecular Crystals and Liquid Crystals Science and Technology.

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“…Common functional groups that contribute to the conjugation lengths include unsaturated rings, such as phenyl rings, and unsaturated bonds, such as carbon-carbon double (19)(20)(21) or triple bonds (22)(23)(24). Among unsaturated carbon-carbon bonds, stilbene (25,26) and diacetylene (27,28) are not stable under ultraviolet illumination and should be avoided. Negative dielectric anisotropy (De,0) can be achieved by introducing polar groups in the lateral positions of a LC compound.…”

Section: Introductionmentioning

confidence: 98%

High birefringence and low viscosity negative dielectric anisotropy liquid crystals

Gauza

Jiao

et al. 2008

Liquid Crystals

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We have synthesised and evaluated the physical properties of some high birefringence, lateral difluoro-terphenyl compounds and mixtures. These mixtures exhibit a high birefringence (Dn,0.24) in the visible spectral range and a relatively low viscosity. When doped in commercial mixtures, the difluoro-terphenyl compounds enhance the mixture's birefringence while causing almost no penalty to the rotational viscosity. These mixtures are particularly attractive for achieving fast response times in thin-cell liquid crystal displays.

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“…The presence of an acetylene group in these materials is important to achieving the desired properties for optical applications, as this group not only affords Δn values similar to, or better than those of the phenyl derivatives, but also lowers the viscosity of the materials as compared to that of the corresponding phenyl derivatives. [11,21] We previously reported LC bis(biphenyl)diacetylene (1,4-bis(biphenyl-4-yl)buta-1,3-diyne) derivatives (BBPDA), bearing two additional phenyl groups as compared to diphenylacetylene (DPDA), as novel calamitic LC molecules with highly anisotropic structures. [28] However, we observed that almost all BBPDA derivatives exhibited highly ordered smectic (Sm) phases over a wide temperature range, along with very high phase transition temperatures.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of novel fluorinated bis(biphenyl)diacetylene derivatives as highly birefringent nematic liquid crystalline materials

et al. 2015

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Three novel fluorinated bis(biphenyl)diacetylene (1,4-bis(biphenyl-4-yl)buta-1,3-diyne) derivatives, with alkoxy tails at the terminal positions, were prepared for use as high-birefringent nematic materials. To lower the thermal transition temperatures and determine the origin of the nematic phase of these compounds, fluorine atoms were introduced at lateral positions. Thermal transition temperatures and mesomorphic properties were investigated by differential scanning calorimetry and polarized optical microscopy. In addition, birefringence was measured using a microscopic method based on the interference method. Both the nematogenic properties and optical performances depended not only on the number of fluorine substituents, but also on the position of the substituents. The compound having the highest fluorine content exhibited the lowest birefringence, and the compound bearing fluorine atoms only on the inner benzene rings of the biphenyl cores exhibited an enantiotropic nematic phase with a maximum birefringence value of 0.48 at 550 nm and 140 C.

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Physical properties of diphenyldiacetylenic liquid crystals

Cited by 70 publications

References 11 publications

Synthesis and Mesogenic Properties of 1-Phenyl-4-(4-n-Alkoxyphenyl-2,3,5,6-Tetrafluorophenyl)-Butadiynes

Synthesis and Mesogenic Properties of 1-Phenyl-4-(4-n-Alkoxyphenyl-2,3,5,6-Tetrafluorophenyl)-Butadiynes

High birefringence and low viscosity negative dielectric anisotropy liquid crystals

Synthesis of novel fluorinated bis(biphenyl)diacetylene derivatives as highly birefringent nematic liquid crystalline materials

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