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Liquid crystal medium and liquid crystal composition

A compound and general formula technology, applied in the field of compounds containing indene ring structure, can solve problems such as weak negative dielectric anisotropy, and achieve the effect of expanding the working temperature range and the synthesis route is simple and feasible

Active Publication Date: 2015-03-04
JIANGSU HECHENG DISPLAY TECHCO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, these negative liquid crystal materials have very weak negative dielectric anisotropy

Method used

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  • Liquid crystal medium and liquid crystal composition
  • Liquid crystal medium and liquid crystal composition
  • Liquid crystal medium and liquid crystal composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] The compound 3IO2OWO2 synthetic route of preparation is as follows:

[0084]

[0085] Its specific process steps are as follows:

[0086] 1) Synthesis of 3IO2OWO2-2

[0087] Add 5.76g of Mg powder and 0.05g of iodine into a 500mL three-necked flask, 10mL of tetrahydrofuran (THF), and protect with nitrogen. Dissolve 47.6g of the 3IO2OWO2-1 compound in 200mL THF solution, slowly add the THF solution of the 3IO2OWO2-1 (commercially available intermediate) compound to the above reaction system, after the reaction is triggered, continue to drop the remaining 3IO2OWO2 The tetrahydrofuran solution of the compound of -1, dropwise, keep the system slightly boiling and reflux for 3 hours, cool to room temperature, lower the temperature to -30°C, control the temperature at -30°C~-10°C, slowly add 92g of triisobutyl borate dropwise and stir at room temperature 0.5-4h. The reaction solution was quenched with dilute hydrochloric acid, extracted with ethyl acetate, the organic p...

Embodiment 2

[0102] The above-mentioned same method synthesizes 2IO2OWO2.

[0103]

[0104] Mass spectra and NMR spectra are shown in image 3 and Figure 4 middle.

[0105] LCD performance:

[0106] Δn: 0.069 Δε: -9.5 Cp: 5.6

Embodiment 3

[0108] The synthetic route of the prepared compound 3IO2OWP3 is as follows:

[0109]

[0110] Its specific process steps are as follows:

[0111] 1) 3IO2OWP3-2, 3IO2OWP3-3, 3IO2OWP3-4 can refer to the synthesis method of 2IO2OWO2-2, 2IO2OWO2-3, 2IO2OWO2-4, the compound 3IO2OWP3-1 shown in the synthetic route diagram is a commercially available intermediate.

[0112] 2) Synthesis of 3IO2OWP3-10

[0113] Add 19.2g of 3IO2OWP3-9 (commercially available intermediate) compound into a 100mL round bottom flask, 30mL of THF, nitrogen protection, drop 50mL of n-butyllithium (n-BuLi, 2.4mol / L) at a low temperature to -78°C, After dropping, the reaction was 2h. Dissolve 46g of triisobutyl borate in 20mL of THF, drop it into the reaction system at -78°C, and let it rise to room temperature naturally after dropping, and stir for 2h. The reaction liquid was poured into dilute hydrochloric acid to quench the reaction, stirred for 30 min, extracted with ethyl acetate, spin-dried the org...

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Abstract

The invention provides compounds having a general formula (I), used as a component of a liquid crystal medium and having an indene ring structure as well as a preparation method and application of the compounds. The compounds are negative liquid crystal compounds, and have the advantages of high dielectric and anisotropic absolute value, proper optical anisotropy, high clearing point and wide nematic phase temperature range; and a display using the compounds can have high response speed and wide working range, and can be well displayed in various environments. The invention also provides a liquid crystal composition comprising one or more of the compounds and a liquid crystal element comprising the liquid crystal composition.

Description

technical field [0001] The invention relates to a compound containing an indene ring structure as a component of a negative liquid crystal medium, and a preparation method and application thereof Background technique [0002] For liquid crystal display elements, according to the display mode of liquid crystal, it is divided into PC (phase change, phase change), TN (twist nematic, twisted nematic), STN (super twisted nematic, super twisted nematic), ECB (electrically controlled birefringence) , electronically controlled birefringence), OCB (optically compensated bend, optically compensated bending), IPS (in-plane switching, coplanar transformation), VA (vertical alignment, vertical alignment) and other types. According to the driving method of the component, it is divided into PM (passive matrix, passive matrix) type and AM (active matrix, active matrix) type. PM is divided into static (static) and multiplex (multiplex) and other types. AM is divided into TFT (thin film tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/225C07C41/16C09K19/32G02F1/13
Inventor 刘琦谭玉东王俊智游蕙如
Owner JIANGSU HECHENG DISPLAY TECHCO
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