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A 7,8-difluoro-5-methyl-1,2,3,4-tetrahydronaphthalene liquid crystal compound and its preparation method and application

A liquid crystal compound, tetralin technology, applied in chemical instruments and methods, liquid crystal materials, organic chemistry, etc., can solve the problems of small wavelength dependence of incident light in the liquid crystal layer, narrow viewing angle, low contrast, etc.

Active Publication Date: 2018-11-06
北京云基科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the current liquid crystal display elements are twisted nematic (TN) mode, but it has the disadvantages of low contrast and narrow viewing angle, while the display of vertical alignment (VA) mode is characterized by its wide viewing angle, high contrast and no need for rubbing alignment, etc. The advantages have been applied, and it has become a common display mode of TFT-LCD for large-size TV. In addition, the contrast displayed by VA mode is less dependent on the birefringence of liquid crystal, the thickness of liquid crystal layer and the wavelength of incident light. Therefore, VA mode has become The current promising liquid crystal display technology

Method used

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  • A 7,8-difluoro-5-methyl-1,2,3,4-tetrahydronaphthalene liquid crystal compound and its preparation method and application
  • A 7,8-difluoro-5-methyl-1,2,3,4-tetrahydronaphthalene liquid crystal compound and its preparation method and application
  • A 7,8-difluoro-5-methyl-1,2,3,4-tetrahydronaphthalene liquid crystal compound and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The structural formula of the liquid crystal compound provided in this embodiment is:

[0067]

[0068] As another technical solution, when ring B is 1,4-cyclohexylene, that is, when the structure of the liquid crystal compound is as shown in general formula III,

[0069] The synthetic route is as follows:

[0070]

[0071] It includes the following steps:

[0072] (1) Metallization reaction with organolithium reagent, and then with Response, get

[0073] (2) By reacting with boron trifluoride ether and triethylsilane to obtain

[0074] Among them, the R, m, and ring A in the compound involved in each step correspond to the groups represented by R, m and the ring A in the resulting liquid crystal compound product (ie, general formula I).

[0075] In step 1) of the above method, Organolithium reagent and The molar ratio of feeding materials is 1.0~3.0:1.0~3.0:1, and the reaction temperature is -60~-100℃;

[0076] Wherein, the organolithium reagent is selected from one or more...

specific Embodiment approach

[0094] The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0095] The raw materials can be obtained from open commercial channels unless otherwise specified.

[0096] According to conventional detection methods in the field, various performance parameters of the liquid crystal compound are obtained by linear fitting, wherein the specific meaning of each performance parameter is as follows:

[0097] △n represents optical anisotropy (25°C); △ε represents dielectric anisotropy (25°C, 1000Hz); γ1 represents rotational viscosity (mPa.s, 25°C).

[0098] Example 1

[0099] The structural formula of the liquid crystal compound provided in this embodiment is:

[0100]

[0101] The synthetic route to prepare compound LC-01 is as follows:

[0102]

[0103] Specific steps are as follows:

[0104] (1) Synthesis of compound LC-01-1:

[0105] Under the protection of nitrogen, add 23.8g of 2-butyl 7,8-difluoro-5-methyl-1,2,3,4-tetrahyd...

Embodiment 2

[0111] According to the technical solution of Example 1, the following liquid crystal compounds can be synthesized by simply replacing the corresponding raw materials without changing any substantial operations.

[0112]

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Abstract

The invention relates to the field of liquid crystal materials, in particular to 7,8-difluoro-5-methyl-1,2,3,4-tetrahydronaphthalene liquid crystal compounds. The compounds have a structure represented as a general formula I, wherein R represents alkyl or alkoxy with 1-12 carbon atoms; a ring A represents 1,4-phenylene, 1,4-cyclohexylidene or 1,4-phenylene with fluorine atoms substituting 1-4 hydrogen atoms; a ring B represents 1,4-phenylene, 1,4-cyclohexylidene, 1,4-cyclohexenylene or 1,4-phenylene with fluorine atoms substituting 1-4 hydrogen atoms; m is 0, 1 or 2. The liquid crystal compounds have the advantages of higher negative dielectric anisotropy, good liquid crystal intersolubility, relatively low rotary viscosity and the like which are needed for improvement of the crystal liquid materials, and the liquid crystal compounds have great application value.

Description

Technical field [0001] The invention belongs to the field of liquid crystal compounds and their applications, and relates to a novel 7,8-difluoro-5-methyl-1,2,3,4-tetrahydronaphthalene liquid crystal compound, and a preparation method and application thereof. technical background [0002] At present, TFT-LCD product technology has matured and successfully solved technical problems such as viewing angle, resolution, color saturation and brightness. Large-size and medium- and small-size TFT-LCD displays have gradually occupied the mainstream position of flat panel displays in their respective fields. However, the requirements for display technology have been continuously improved. Liquid crystal displays are required to achieve faster response, reduce driving voltage to reduce power consumption, etc., which also require liquid crystal materials to have low voltage driving, fast response, wide temperature range and good The low temperature stability. Current liquid crystal display ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/10C09K19/34G02F1/1333
CPCC09K19/3405G02F1/1333
Inventor 杭德余
Owner 北京云基科技股份有限公司
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