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Liquid crystal compound and composition for improving liquid crystal material environmental suitability

A technology of liquid crystal compounds and liquid crystal compositions, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., which can solve the problems of easy crystallization, low solubility, high melting point, etc.

Active Publication Date: 2019-05-14
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, this type of fluorine-containing quaterphenyl liquid crystal compound has a relatively high melting point, resulting in low solubility in mixed liquid crystals, and crystallization is prone to occur at low temperatures

Method used

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  • Liquid crystal compound and composition for improving liquid crystal material environmental suitability
  • Liquid crystal compound and composition for improving liquid crystal material environmental suitability
  • Liquid crystal compound and composition for improving liquid crystal material environmental suitability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Synthesis of 3,4,5-trifluoro-2"-methyl-4"'-pentyl-1,1':4',1":4",1"'-quaterphenyl

[0106] The specific structure is as follows:

[0107]

[0108] The preparation process is as follows:

[0109] Step 1: Synthesis of 4-bromo-3-methyl-4'-pentyl-1,1'-biphenyl

[0110]

[0111] Under the protection of nitrogen, add 4-pentylphenylboronic acid (38.4g, 0.2mol) and 2-bromo-5-iodotoluene successively to a 1L three-neck round-bottomed flask equipped with mechanical stirring, reflux condenser, thermometer, and nitrogen gas guide tube (59.4g, 0.2mol), anhydrous potassium carbonate (82.8g, 0.6mol), tetrabutylammonium bromide (6.4g, 0.02mol), toluene (200mL), ethanol (200mL), water (200mL), and finally Add bis(triphenylphosphine)palladium dichloride (2.1 g, 3 mmol), and replace with nitrogen three times. Turn on the heating, the system rises to an internal temperature of 60°C, keep it warm for 4-6 hours, and then stop the reaction. Cool down to room temperature, let stand to...

Embodiment 2

[0119] Synthesis of 2"-chloro-3,4,5-trifluoro-4"'-propyl-1,1':4',1":4",1"'-quaterphenyl

[0120] The specific structure is as follows:

[0121]

[0122] The preparation process is as follows:

[0123] (1) Synthesis of 4-bromo-3-chloro-4'-propyl-1,1'-biphenyl

[0124]

[0125] Under the protection of nitrogen, add 4-propylphenylboronic acid (27.9g, 0.17mol), 3-chloro-4-bromoiodide in sequence to a 1L three-necked round-bottomed flask equipped with mechanical stirring, reflux condenser, thermometer, and nitrogen gas guide tube. Benzene (54g, 0.17mol), anhydrous potassium carbonate (70.4g, 0.51mol), tetrabutylammonium bromide (5.5g, 0.017mol), toluene (180mL), ethanol (180mL), water (180mL), and finally Bis(triphenylphosphine)palladium dichloride (1.2 g, 1.7 mmol) was added and replaced with nitrogen three times. Turn on the heating, reflux for 4 to 6 hours, and stop the reaction. Cool down to room temperature, stand to separate layers, extract the aqueous phase with to...

Embodiment 3

[0136] Synthesis of 2"-chloro-2',3,4,5-tetrafluoro-4"'-propyl-1,1':4',1":4",1"'-quaterphenyl

[0137] The specific structure is as follows:

[0138]

[0139] 4'-bromo-3,4,5-trifluoro- 1,1'-biphenyl, the target compound 2"-chloro-2', 3,4,5-tetrafluoro-4"'-propyl-1 can be synthesized according to the same method,

[0140] 1': 4', 1": 4", 1"'-quaterphenyl.

[0141] Structural identification data: 1 H NMR (δ, CDCl 3 ): 7.726~7.723(m, 1H), 7.568~7.528(m, 3H), 7.467~7.403(m, 2H), 7.375~7.324(m, 2H), 7.297~7.241(m, 4H), 2.666~2.635 (t, 2H, J=7.5Hz), 1.733~1.658 (m, 2H), 0.999~0.970 (t, 3H, J=7Hz).

[0142] MS (70eV) m / z (%): 456.2 (26.9), 455.3 (22.65), 454.3 (M + , 75.14), 427.2 (35.83), 426.2 (28.87), 425.2 (100), 389.2 (15.31), 212.6 (43.45).

[0143] The above structural identification data show that the synthesized compound is indeed the compound 2"-chloro-2',3,4,5-tetrafluoro-4"'-propyl-1,1':4',1":4" , 1"'-quaterphenyl.

[0144] The phase transition temperature of t...

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Abstract

The invention discloses a nematic-phase liquid crystal composition. The nematic-phase liquid crystal composition comprises one or more compounds as shown in a structure general formula (1): the structure general formula (1) is as shown in the description, wherein R is a linear chain alkyl, an alkenyl, and an alkoxy of which a carbon number is 1-9; and X1-X4 is a methyl, a helium atom, a fluorine atom or a hydrogen atom, and at least one of the X1-X4 is the methyl or the helium atom. The nematic-phase liquid crystal composition has the characteristics of high environmental suitability and a wide liquid crystal phase area, and is suitable for TFT liquid crystal display, especially liquid crystal display modes of TN, IPS, FFS, OCB, a blue phase and the like.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials, and in particular relates to a liquid crystal compound and a composition for improving the environmental adaptability of liquid crystal materials. Background technique [0002] Liquid crystal displays have the advantages of flat panels, low power consumption, light weight, and no radiation, and are developing rapidly in the field of information display. Liquid crystal displays utilize the properties of optical anisotropy and dielectric anisotropy of liquid crystal materials to realize display functions. Classified according to the display mode, there are twisted nematic (TN), super twisted nematic (STN), dynamic scattering mode (DSP), thin film transistor driving mode (TFT) and so on. TFT liquid crystal display can realize full color, high resolution, wide viewing angle, fast response, etc. It has been widely used and is the most important display technology in the market at pre...

Claims

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Application Information

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IPC IPC(8): C09K19/12C09K19/44
Inventor 李建杨晓哲安忠维胡明刚李娟利万丹阳莫玲超车昭毅
Owner XIAN MODERN CHEM RES INST
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