Achiral side methyl alkyl quaterphenyl liquid crystal compound and preparation method, liquid crystal composition and microwave communication device

A technology of methyl alkyl tetrabiphenyls and liquid crystal compositions, which is applied in the preparation of amino compounds, waveguide type devices, hydrocarbon compounds and the like from amines, can solve the problem that liquid crystal materials for microwaves cannot be satisfied, and the low temperature properties of liquid crystal materials are affected. The problem of large dielectric loss of liquid crystal materials can achieve the effect of increasing optical anisotropy, large sum of optical anisotropy, and reducing dielectric loss.

Active Publication Date: 2021-09-17
WUHAN POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of a large number of existing researches, it is found that the current liquid crystal materials for microwave use mainly have the following problems in practical applications: first, the optical anisotropy Δn value is too small, less than 0.22, resulting in insufficient phase shift; second, due to The wave-absorbing and polarizable effects of structural groups in liquid crystal molecules lead to large dielectric loss of liquid crystal materials; finally, the lack of liquid crystal solvents and nematic liquid crystal components with high Δn values ​​and low melting points affects the properties of liquid crystal materials. low temperature performance
The above problems make microwave liquid crystal materials unable to meet the requirements of microwave devices. Therefore, it is urgent to propose a new type of nematic liquid crystal compound with high stability, Δn≥0.35, low melting point, high dielectric loss and low consumption.

Method used

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  • Achiral side methyl alkyl quaterphenyl liquid crystal compound and preparation method, liquid crystal composition and microwave communication device
  • Achiral side methyl alkyl quaterphenyl liquid crystal compound and preparation method, liquid crystal composition and microwave communication device
  • Achiral side methyl alkyl quaterphenyl liquid crystal compound and preparation method, liquid crystal composition and microwave communication device

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Experimental program
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preparation example Construction

[0062] figure 1 The process is schematic flow diagram of the preparation method of the non-haired side methyl alkyl tetraplenzene liquid crystal compound (I-1) provided by the present invention, at this time, Y is an F atom, including the following steps:

[0063] Step S10: Under nitrogen protection, bromobear is dissolved in tetrahydrofuran, followed by mixing to magnesium powder, tetrahydrofuran, and iodine monomi, sufficiently reacted, and the Grid reagent, adding the grace reagent to copper chloride, DL-1-iodo-2-methylbutane and mixture of tetrahydrofuran, reflow reaction, then dilute hydrochloric acid, stir, then separated, washing and purification, the first intermediate;

[0064] In this step, the separation, washing, and purification treatment can be carried out in accordance with the conventional method in the art of organic synthesis, for example, separation can be extracted, washing water to the product is neutral, purified with recrystallization, and the like. The fol...

Embodiment 1

[0123] Example 1 Synthesis of PGPUS, Structure of PGPUS:

[0124]

[0125] The preparation process is:

[0126] (1) Titanium (0.285 mol), 10 ml of anhydrous tetrahydrofuran and 1-2 iodine monohydrate, then dissolved in 100 ml of anhydrous tetrahydrofuran (0.28 mol) 43.6 g (0.28 mol) (0.28 mol) (0.28 mol) (0.28 mol) (0.28 mol) (0.28 mol) (0.28 mol) dissolved in 100 ml of water tetrahydrofuran (0.28 mol) ) The bromobenzene solution was added to a 250 mL constant pressure drop funnel. Nitrogen protection, dripping a little brodipate into a three-bottle from a constant pressure drip funnel, micro-heat. After the reaction is initiated, heating is stopped. Slowly stir, and pixab bromobenzene is mixed into a three-bottle to make it reflow. After the measuring, the temperature was refluxed for about 30 min until the magnesium was close to completely reacted, stop heating, naturally cooled to room temperature, and the reaction liquid was a gray liquid (Ghr's agent).

[0127] Anhydrous co...

Embodiment 2

[0136] Example 2 Synthesis of PWPUS, Structure:

[0137]

[0138] The step is the same as that of Example 1, in which the inverted fluorine boric acid in step (3) is replaced with michlorobree boric acid; the temperature is raised to 110 ° C in step (2), step (4) cooling to -75 At ° C, stirring 2 h then rose to 20 ° C, third intermediate, n-butyllithium, boric acid trimethylate and hydrochloric acid in the fourth intermediate, third reactant in the fourth intermediate, third reactant in step (5) K 2 CO 3 The molar ratio of the palladium catalyst is 1: 2: 5: 0.001, the molar ratio of the fifth intermediate, calcium carbonate and chloride sulfide in step (6) is 1: 2: 2, and the ice bath is cooled to 5 ° C, then Naturally heated to 25 ° C, and finally warmed to 50 ° C.

[0139] The structure of the target compound produced by the hydrogen magnetic resonance spectroscopy and fluorine-nuclear magnetic resonance spectroscopy is demonstrated to the structure of the above-described stru...

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Abstract

The invention discloses an achiral side methyl alkyl quaterphenyl liquid crystal compound and a preparation method thereof, a liquid crystal composition and a microwave communication device. The achiral side methyl alkyl quaterphenyl liquid crystal compound has the following properties: A structure represented by structural formula (I). The compound (I) has quaterphenyl and branched methyl alkyl structural units at the same time, because the branched methyl alkyl is an achiral conformation, which not only increases the molecular flexibility of the quaterphenyl liquid crystal compound, but also makes the non- Chiral pendant methyl alkyl quaterphenyl liquid crystal compound (I) has a stable structure and has the advantages of low melting point, large optical anisotropy and wide temperature nematic equivalence; it is applied to liquid crystals with high dielectric anisotropy When in the material, it is beneficial to reduce the dielectric loss of liquid crystal microwave devices, increase the microwave phase modulation capability and improve the quality factor of liquid crystal materials.

Description

Technical field [0001] The present invention relates to the field of organic synthesis, and in particular, to a non-haired side methyl alkyl tetrabenzene liquid crystal compound and a preparation method thereof, a liquid crystal composition, and a microwave communication device. Background technique [0002] At present, the liquid crystal has been widely used in the field of display. With the development of technology, the application range of liquid crystal has gradually increased, and the liquid crystal for microwave device is used to begin in the late 20th century. Especially in the early years, especially in recent years Get extensive attention from the world, develops rapidly, and studies have found that they can be used for important areas such as adjustment filter, reconfigurable antenna, adjustable frequency selector and adjustable phase. However, in related key technologies, such as liquid crystal materials, orientation, packaging, wiring, device design and function char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/12C09K19/44C07C331/28C07C25/18C07F3/02C07C1/32C07C15/14C07C17/12C07F5/02C07C209/68C07C211/52C07C17/263H01Q15/00H01P1/18H01P1/20
CPCC09K19/12C09K19/44C07C331/28C07C25/18C07F3/02C07C1/326C07C17/12C07F5/025C07C209/68C07C17/263H01Q15/002H01P1/18H01P1/20C07C15/14C07C211/52
Inventor 张智勇卢金应李诗妍黄舒豪刘豪浩关金涛乔俊飞陈红梅张海燕丁佩佩汪相如余承勇赵怿哲高时汉胡俊祥
Owner WUHAN POLYTECHNIC UNIVERSITY
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