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Cyano group-substituted stilbene-type liquid crystal material and its preparation technology and use

A stilbene, cyano-substituted technology, used in liquid crystal materials, preparation of carboxylic acid nitrile, preparation of organic compounds, etc., can solve the problem of inability to achieve self-luminescence, achieve good compatibility and self-luminescence characteristics, preparation Simple process and the effect of dynamic adjustment

Inactive Publication Date: 2014-04-09
HEFEI UNIV OF TECH
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  • Application Information

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Problems solved by technology

These small-molecular liquid crystal compounds can only be used as the main material for liquid crystal display. At present, liquid crystal display devices still need to use light-emitting diodes as backlight sources, which cannot achieve self-illumination. Therefore, designing a self-luminous material for use as a backlight source will greatly improve Save cost and simplify process

Method used

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  • Cyano group-substituted stilbene-type liquid crystal material and its preparation technology and use
  • Cyano group-substituted stilbene-type liquid crystal material and its preparation technology and use
  • Cyano group-substituted stilbene-type liquid crystal material and its preparation technology and use

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Embodiment

[0035] 1. Preparation of cyano-substituted stilbene type liquid crystal material, the synthetic route is:

[0036]

[0037] 1.1 Intermediate T 1 preparation of

[0038] Weigh p-nitrophenylacetonitrile (162mg, 1mmol), p-hydroxybenzaldehyde (122mg, 1mmol), dissolve in 25mL ethanol, ( ) add 4 drops of piperidine, control the reaction temperature at 78°C and reflux for 3.5h, cool down after the reaction to room temperature, filter off the solid, wash with ethanol three times, and recrystallize to obtain the product T 1 (229mg, 0.861mmol), the yield was 86.1%.

[0039] 1.2 Intermediate T 2 preparation of

[0040] Weigh the intermediate T 1 (1.14g, 4.286mmol) was dissolved with 40mL dioxane, and Na 2 S·9H 2 O (5.16g, 0.0215mol), control the reaction temperature at 90°C and reflux for 4h, cool to room temperature after the reaction, and use NaHCO 3 Adjust the pH to about 8, extract with ethyl acetate, and obtain the yellow-green compound T through column chromatography (pe...

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Abstract

The invention discloses a cyano group-substituted stilbene-type liquid crystal material and its preparation technology and use. A liquid crystal fluorescent display utilizes the novel cyano group-substituted stilbene-type liquid crystal material. The cyano group-substituted stilbene-type liquid crystal material is a good liquid crystal material, has fluorescence radiation properties and can produce photoisomerization under ultraviolet irradiation. Fluorescent molecular dispersed liquid crystals are prepared by doping of the cyano group-substituted stilbene-type liquid crystal material and nematic liquid crystals, and the mixture is poured into a liquid crystal box. The mixture in the liquid crystal box produces photoisomerization under ultraviolet irradiation so that the cyano group-substituted stilbene-type liquid crystal material and the nematic liquid crystals produce phase separation. An AC voltage is applied to two ends of the liquid crystal box, and through power supply opening and closing, the dynamically reversible adjustable electrically-controlled liquid crystal fluorescent display is prepared. Based on the above properties, the electrically-controlled liquid crystal fluorescent display has a wide application prospect in the modern displaying and photoelectric field.

Description

technical field [0001] The invention relates to the field of liquid crystal materials, in particular to a cyano-substituted stilbene type liquid crystal material and its preparation process and its application in electronically controlled liquid crystal fluorescent display devices. Background technique [0002] In recent years, due to its good optical and electrical properties, liquid crystal materials have been widely used in the field of display to make various display devices, and have become a hot spot of scientific research. Currently, the liquid crystal materials used in the display field mainly include TN-LCD liquid crystal materials, STN-LCD liquid crystal materials, and TFT-LCD liquid crystal materials. TN-LCD liquid crystal materials are mainly biphenyls, phenylcyclohexanes and ester organic liquid crystal compounds; STN-LCD liquid crystal materials are mainly esters, ethanes, dicyclohexanes, pyrimidines and tolanes And alkenyl organic liquid crystal compounds; TF...

Claims

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Application Information

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IPC IPC(8): C09K19/16C07C255/43C07C253/30
Inventor 陆红波张贵玉张姗娜杨家祥吕国强邱龙臻许伟
Owner HEFEI UNIV OF TECH
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