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

A technology of liquid crystal compounds and compounds, applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of unfavorable low threshold voltage temperature range of liquid crystal display devices, small dielectric anisotropy, small clearing point, etc., to achieve Effect of wide nematic temperature range, short response time, and good contrast

Active 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

[0016] Although these difluorodibenzo compounds have small rotational viscosity, they have the problems of small dielectric anisotropy and small clearing point, which are not conducive to the construction of liquid crystal displays with low threshold voltage and wide temperature range. device

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

[0235] The synthetic route of compound I-1-3-1 is as follows:

[0236]

[0237] Step 1. Preparation of compounds of formula B-3

[0238] Add 110g of the compound of formula B-1 ((4-ethoxy-2,3-difluorophenyl)boronic acid)) and 100g of the compound of formula B-2 (2-bromo-6-fluorophenol ) and 110g 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, 1.8g of 4-3-Pd (tetraphenylphosphine palladium) was added, and the reaction was refluxed for 6h. The reaction solution was cooled, 300 mL of water was added for liquid separation, the aqueous phase was extracted with toluene, the organic phases were combined, and the organic phase was washed with saturated brine to pH=7, dried, concentrated, and mixed solvent (petroleum ether) composed of petroleum ether and toluene The volume ratio to toluene is 24:1) and recrystallize...

Embodiment 2

[0250] The synthetic routes of compounds I-3-9-1 and I-3-5-1 are as follows:

[0251]

[0252] Step 1. Preparation of compounds of formula B-8

[0253] In a 2L reaction flask, add 80g of the compound of formula B-7 ((2,3-difluoro-4'-propyl-[1,1'-biphenyl]-4-yl)boronic acid), 52.71g of formula B -2 compound (2-bromo-6-fluorophenol) and 86g of sodium carbonate, and use 1.2L of mixed solvent consisting of toluene, ethanol and water (the volume ratio of toluene, ethanol and water is 2:1:1) dissolve. Under the condition of nitrogen protection, 1.8g of 4-3-Pd (tetraphenylphosphine palladium) was added, and the reaction was refluxed for 6h. The reaction solution was cooled, 300mL of water was added, the aqueous phase was extracted with toluene, the organic phases were combined, the organic phase was washed with saturated brine to pH=7, dried, concentrated, and a mixed solvent composed of petroleum ether and toluene (petroleum ether and toluene The volume ratio is 24:1) to obt...

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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 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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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/91C09K19/34C09K19/44G02F1/137
CPCC07D307/91C09K19/0403C09K19/3405C09K19/44G02F1/137C09K2019/0414C09K2019/3408
Inventor 陈法兵陈俊利宋晓龙徐爽姜志炜胡步洋
Owner JIANGSU HECHENG ADVANCED MATERIALS
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