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Negative liquid crystal composition containing dibenzofuran compound and application thereof

A dibenzofuran, negative liquid crystal technology, applied in liquid crystal materials, nonlinear optics, chemical instruments and methods, etc., to achieve the effects of good low temperature mutual solubility, wide applicability, and shortened response time

Pending Publication Date: 2022-02-11
重庆汉朗精工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as people's requirements for display technology are getting higher and higher, and with the popularization of mobile phones and tablets, there are more and more display usage scenarios, and the requirements for response speed under low temperature conditions are also getting higher and higher. It is becoming more and more difficult to achieve fast response, especially fast low-temperature response performance, by changing the display mode. Therefore, there is still a continuous demand for new liquid crystal materials that can improve the response speed of negative liquid crystals.

Method used

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  • Negative liquid crystal composition containing dibenzofuran compound and application thereof
  • Negative liquid crystal composition containing dibenzofuran compound and application thereof
  • Negative liquid crystal composition containing dibenzofuran compound and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Embodiment 1: the synthesis of compound LDT-1

[0080]

[0081] (1) Synthesis of LDT-1-2

[0082] Add 150ml THF into a 500ml reaction flask, under nitrogen protection, add 23.8g LDT-1-1, 150ml tetrahydrofuran to the reaction flask, add 0.15mol n-butyllithium n-hexane solution dropwise at -70~-80℃, drop After completing the temperature control reaction for 1 hour, 28.2 g of triisopropyl borate was added dropwise under temperature control at -60 to -70 °C, kept for 1 h, and then returned to -20 °C naturally. Add 400ml of 2M hydrochloric acid aqueous solution for acidification, carry out conventional post-treatment, and recrystallize petroleum ether to obtain light yellow solid compound LDT-1-1, weight 24g, HPLC: 99.8%, yield: 85%.

[0083] (2) Synthesis of LDT-1-4

[0084] Add 28g LDT-1-2, DMF 100ml, water 50ml, anhydrous potassium carbonate 27.6g, LDT-1-332g, tetrakistriphenylphosphine palladium 0.5g into a 500ml reaction bottle, heat up to 70°C for 4h, then use ace...

Embodiment 2

[0088] Embodiment 2: the synthesis of LDT-2

[0089]

[0090] (1) Synthesis of LDT-2-2

[0091] Add 150ml of THF to a 500ml reaction flask, under the protection of nitrogen, add 28.2g, 150ml of tetrahydrofuran to the reaction flask, add 0.15mol of n-butyllithium n-hexane solution dropwise at -70~-80°C under temperature control, and complete the temperature control reaction 1 28.2 g of triisopropyl borate was added dropwise at -60 to -70°C under temperature control, kept for 1 hour, and then returned to -20°C naturally. Add 400ml of 2M hydrochloric acid aqueous solution for acidification, perform conventional post-treatment, and recrystallize petroleum ether to obtain light yellow solid compound LDT-1-1, weight 27.1g, HPLC: 99.8%, yield: 83%.

[0092] (2) Synthesis of LDT-2-3

[0093] Add 32.6g of LDT-2-1, 100ml of DMF, 50ml of water, 27.6g of anhydrous potassium carbonate, 32g of LDT-1-2, 0.5g of palladium tetrakistriphenylphosphine into a 500ml reaction bottle, heat up t...

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Abstract

The invention relates to a negative liquid crystal composition containing a dibenzofuran compound and application of the negative liquid crystal composition, and belongs to the field of liquid crystal materials. The negative liquid crystal composition comprises at least one compound with a dibenzofuran structure, the structure of the compound being shown as a general formula I shown in the specification, at least one compound as shown in a general formula II shown in the specification, at least one compound as shown in a general formula III shown in the specification and at least one compound as shown in a general formula IV shown in the specification. The adopted compounds have stable chemical and physical properties, good low-temperature intersolubility, and moderate dielectric anisotropy and the refractive index anisotropy, and can be widely applied. The negative liquid crystal composition is good in low-temperature intersolubility and large in elastic constant, and the response time, especially the low-temperature response time, can be shortened.

Description

technical field [0001] The invention relates to a negative liquid crystal composition and its application, in particular to a dielectric negative liquid crystal composition containing a dibenzofuran structure compound and its application, and belongs to the field of liquid crystal materials. Background technique [0002] Liquid crystal display devices are used in various home appliances including clocks and calculators, measuring equipment, automotive panels, word processors, electronic notebooks, printers, computers, and televisions. As liquid crystal display methods, the representative methods are TN (twisted nematic) type, STN (super twisted nematic) type, DS (dynamic light scattering) type, GH (guest-host) type, IPS (in-plane switching) type, OCB (Optically Compensated Birefringence) type, ECB (Voltage Controlled Birefringence) type, VA (Vertical Alignment) type, CSH (Color Super Vertical) type, or FLC (Ferroelectric Liquid Crystal) or the like. Also, examples of drivin...

Claims

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Application Information

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IPC IPC(8): C09K19/44C09K19/06G02F1/1333
CPCC09K19/44C09K19/06G02F1/1333C09K2019/0414
Inventor 史志兵孙刚
Owner 重庆汉朗精工科技有限公司
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