7,8-difluoro-5-methyl-1,2,3,4-tetrahydronaphthalene liquid crystal compounds as well as preparation method and application thereof

A technology of liquid crystal compounds and tetralin, applied in chemical instruments and methods, liquid crystal materials, optics, etc., can solve problems such as low contrast, small wavelength dependence of incident light on the liquid crystal layer, narrow viewing angle, etc.

Active Publication Date: 2017-03-08
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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  • 7,8-difluoro-5-methyl-1,2,3,4-tetrahydronaphthalene liquid crystal compounds as well as preparation method and application thereof
  • 7,8-difluoro-5-methyl-1,2,3,4-tetrahydronaphthalene liquid crystal compounds as well as preparation method and application thereof
  • 7,8-difluoro-5-methyl-1,2,3,4-tetrahydronaphthalene liquid crystal compounds as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The structural formula of the liquid crystal compound provided by this embodiment is:

[0068]

[0069] As another technical solution, when ring B is 1,4-cyclohexylene, that is, when the structure of the liquid crystal compound is shown in general formula III,

[0070] Its synthetic route is as follows:

[0071]

[0072] Specifically include the following steps:

[0073] (1) Carry out metallation reaction with organolithium reagent, and then with react to get

[0074] (2) By reacting with boron trifluoride ether, triethylsilane, to obtain

[0075] Wherein, R, m, and ring A in the compounds involved in each step correspond to the groups represented by R, m, and ring A in the obtained liquid crystal compound product (ie, general formula I).

[0076] In step 1) described in the above method, Organolithium reagents and The feeding molar ratio is 1.0~3.0:1.0~3.0:1, and the reaction temperature is -60~-100℃;

[0077] Wherein, the organolithium reagen...

specific Embodiment approach

[0095] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0096] The raw materials can be obtained from open commercial channels unless otherwise specified.

[0097] According to conventional detection methods in this field, various performance parameters of the liquid crystal compound are obtained by linear fitting, wherein, the specific meanings of each performance parameter are as follows:

[0098] Δn represents optical anisotropy (25°C); Δε represents dielectric anisotropy (25°C, 1000Hz); γ1 represents rotational viscosity (mPa.s, 25°C).

[0099] Example 1

[0100] The structural formula of the liquid crystal compound provided by this embodiment is:

[0101]

[0102] The synthetic route for preparing compound LC-01 is as follows:

[0103]

[0104] Specific steps are as follows:

[0105] (1) Synthesis of compound LC-01-1:

[0106] Under the protection of nitrogen, add 23.8g 2-bu...

Embodiment 2

[0112] 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 substantive operations.

[0113]

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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 its preparation method and application. [0002] technical background [0003] 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 small and medium-sized 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, requiring liquid crystal displays to achieve faster response, lower driving voltage to reduce power consumption, etc., which requires liquid crystal materials to have low voltage drive, fast response, wide temperature range and good performance. low temperature stability. Most of the current liquid...

Claims

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Application Information

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IPC IPC(8): C09K19/34G02F1/1333
CPCC09K19/3405G02F1/1333
Inventor 杭德余
Owner 北京云基科技股份有限公司
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