Liquid crystal compound and liquid crystal composition containing same, and liquid crystal display device

A liquid crystal compound and liquid crystal composition technology, applied in liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of unfavorable construction reaction speed, small use temperature range, high viscosity, etc., and achieve a wide nematic phase temperature range, Effect of Short Response Time, Low Threshold Voltage

Pending Publication Date: 2021-10-22
JIANGSU HECHENG ADVANCED MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] Although these fluorodibenzo compounds have a large absolute value of dielectric anisotropy, they have the problems of high viscosity and small operating temperature range, which is not conducive to the construction of liquid crystal display devices with fast reaction speed and wide operating temperature range.

Method used

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  • Liquid crystal compound and liquid crystal composition containing same, and liquid crystal display device
  • Liquid crystal compound and liquid crystal composition containing same, and liquid crystal display device
  • Liquid crystal compound and liquid crystal composition containing same, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0205] The synthetic route of compound I-1-1 is as follows:

[0206]

[0207] Step 1. Preparation of compounds of formula B-3

[0208] Add 160g of the compound of formula B-1 ((4-ethoxy-2,3-difluorophenyl)boronic acid), 160.5g of the compound of formula B-2 (2-bromo-6-fluorophenol ) and 72g of sodium carbonate, and fully dissolved with 1.2L of a mixed solvent consisting of toluene, ethanol and water (the volume ratio of toluene, ethanol and water is 2:1:1). Under the condition of nitrogen protection, 0.5 g of dichlorodi-tert-butyl-(4-dimethylaminophenyl) phosphine palladium (II) was added, and the mixture was refluxed for 6 h. After the reaction, the reaction solution was cooled, 500 mL of water was added for liquid separation, the aqueous phase was extracted with toluene, the organic phase was combined, and the organic phase was washed with saturated brine until neutral, dried, concentrated, and recrystallized with isopropanol to obtain 182.8 g (purity: 99.35%, Yield: ...

Embodiment 2

[0223] The synthetic route of compound I-3-5-1 is as follows:

[0224]

[0225] Step 1. Preparation of compounds of formula B-8

[0226] In a 3L reaction flask, add 120g of the compound of formula B-7 ((2,3-difluoro-4'-propyl-[1,1'-biphenyl]-4-yl)boronic acid), 160.5g of formula B -2 compound (2-bromo-6-fluorophenol) and 83g of sodium carbonate, and use 1.2L of mixed solvent composed of toluene, ethanol and water (the volume ratio of toluene, ethanol and water is 2:1:1) dissolve. Under the condition of nitrogen protection, 0.5 g of dichlorodi-tert-butyl-(4-dimethylaminophenyl) phosphine palladium (II) was added, and the mixture was refluxed for 6 h. After the reaction is over, cool the reaction solution, add 500mL of water for liquid separation, extract the aqueous phase twice with toluene, combine the organic phases, wash the organic phases with saturated brine until neutral, dry, concentrate, and use a mixture of toluene and ethanol to Solvent (the volume ratio of to...

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PUM

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Abstract

The invention provides a liquid crystal compound shown in a general formula I, a liquid crystal composition containing the liquid crystal compound and a liquid crystal display device containing the liquid crystal composition. Compared with the prior art, the liquid crystal compound shown in the general formula I provided by the invention has a relatively large clearing point, relatively large optical anisotropy and a relatively large dielectric anisotropy absolute value under the condition of maintaining proper rotary viscosity, the liquid crystal composition containing the liquid crystal compound has a large clearing point, large optical anisotropy, a large dielectric anisotropy absolute value, a large elastic constant and a small ratio of the rotary viscosity to the spreadwise elastic constant under the condition that proper low-temperature storage stability and proper rotary viscosity are maintained, and therefore, the liquid crystal display device containing the liquid crystal composition has a wide nematic phase temperature range, a good contrast ratio, a low threshold voltage and short response time.

Description

technical field [0001] The invention relates to the field of liquid crystals, in particular to a liquid crystal compound, a liquid crystal composition containing the liquid crystal compound and a liquid crystal display device containing the liquid crystal composition. Background technique [0002] Liquid crystal display elements can be used in various home appliances represented by clocks and electronic calculators, measuring equipment, automotive panels, word processors, computers, printers, televisions, and the like. According to the type of display mode, liquid crystal display elements can be divided into PC (phase change, phase change), TN (twist nematic, twisted nematic), STN (super twisted nematic, super twisted nematic), ECB (electrically controlled birefringence, electrically controlled Birefringence), OCB (optical compensated bend), IPS (in-plane switching, in-plane transition), VA (vertical alignment, vertical alignment) and other types. According to the driving m...

Claims

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Application Information

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IPC IPC(8): C09K19/34C07D307/91C09K19/44G02F1/137
CPCC09K19/3405C07D307/91C09K19/44G02F1/137C09K2019/3408
Inventor 姜志炜宋晓龙徐爽陈法兵陈俊利胡步洋
Owner JIANGSU HECHENG ADVANCED MATERIALS
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