Search

CN-121991702-A - Liquid crystal compound and application thereof

CN121991702ACN 121991702 ACN121991702 ACN 121991702ACN-121991702-A

Abstract

The invention provides a liquid crystal compound and application thereof. The liquid crystal compound has a structure shown in a formula I. The liquid crystal compound has the excellent characteristics of high dielectric anisotropy, good liquid crystal intersolubility, relatively low rotational viscosity and the like, and can be used for improving the performance of liquid crystal materials. Formula I.

Inventors

  • SHI ZHILIANG
  • LIANG XIANLI
  • YANG BO
  • HANG DEYU

Assignees

  • 北京燕化集联光电技术有限公司

Dates

Publication Date
20260508
Application Date
20260130

Claims (10)

  1. 1. A liquid crystal compound having a structure as shown in formula I: A formula I; wherein X is selected from O or S; R is selected from any one of halogenated or unsubstituted C1-C12 alkyl, halogenated or unsubstituted C1-C12 alkoxy, halogenated or unsubstituted C3-C10 cycloalkyl, halogenated or unsubstituted C2-C12 alkenyl and halogenated or unsubstituted C2-C12 alkenyloxy; Ring a, ring B are each independently selected from any one of a halogenated or unsubstituted 1, 4-phenylene, a halogenated or unsubstituted 1, 4-cyclohexylene, a halogenated or unsubstituted 1, 4-cyclohexenylene, a halogenated or unsubstituted tetrahydropyranyl, a halogenated or unsubstituted 1, 3-dioxanyl; m is 0,1 or 2, n is 0 or 1, and m, n are not simultaneously 0.
  2. 2. The liquid crystal compound according to claim 1, wherein the rings a, B are each independently selected from 1, 4-phenylene, 1, 4-cyclohexylene, 1, 4-cyclohexenylene, tetrahydropyranyl, 1, 3-dioxanylene or 1, 4-phenylene in which at least one H is substituted with fluorine.
  3. 3. The liquid crystal compound according to claim 1 or 2, wherein the rings a, B are each independently selected from any one of the following groups: 、 、 、 、 、 、 Or (b) 。
  4. 4. A liquid crystal compound according to any one of claims 1 to 3, wherein the liquid crystal compound has a structure as shown in any one of formulae I-1 to I-44: wherein R, X is as defined in formula I.
  5. 5. The liquid crystal compound according to any one of claims 1 to 4, wherein the liquid crystal compound comprises a compound represented by any one of the following structures: 。
  6. 6. A liquid crystal material composition comprising the liquid crystal compound according to any one of claims 1 to 5.
  7. 7. The liquid crystal material composition according to claim 6, wherein the mass percentage of the liquid crystal compound in the liquid crystal material composition is 1-60%, preferably 1-40%, and more preferably 5-20%.
  8. 8. Use of a liquid crystal compound according to any one of claims 1 to 5 or a liquid crystal material composition according to claim 6 or 7 in the field of liquid crystal displays.
  9. 9. Use of a liquid crystal compound according to any one of claims 1 to5 or a liquid crystal material composition according to claim 6 or 7 in a liquid crystal display device, preferably as a liquid crystal material in a liquid crystal display device.
  10. 10. The use according to claim 9, wherein the liquid crystal display device is selected from any one of TN, ADS, VA, PSVA, FFS, IPS liquid crystal displays.

Description

Liquid crystal compound and application thereof Technical Field The invention relates to the technical field of liquid crystal compounds, in particular to a novel liquid crystal compound and application thereof. Background The application of the liquid crystal material as an environment material in the fields of information display materials, organic optoelectronic materials and the like has great research value and good application prospect. At present, the technology of TFT-LCD products is mature, which successfully solves the technical problems in terms of visual angle, resolution, color saturation, brightness and the like, and large-size and medium-small-size TFT-LCD displays gradually occupy the mainstream position of flat panel displays in the respective fields. However, the requirements for display technology have been continuously increasing, for example, a liquid crystal display is required to achieve faster response, a driving voltage is reduced to reduce power consumption, etc., which also requires a liquid crystal material having low voltage driving, fast response, a wider temperature range, and good low temperature stability. The liquid crystal material itself plays an important role in improving the performance of the liquid crystal display, and particularly, the reduction of the rotational viscosity of the liquid crystal material and the increase of the dielectric anisotropy delta epsilon of the liquid crystal material will obviously improve the performance of the liquid crystal display. Therefore, to improve the performance of liquid crystal materials to meet new requirements, the study of the synthesis and structure-performance relationship of novel structure liquid crystal compounds has become an important task in the liquid crystal field. Disclosure of Invention The invention aims to develop a novel liquid crystal compound with dielectric anisotropy, which has excellent characteristics of high dielectric anisotropy, good liquid crystal intersolubility, relatively low rotational viscosity and the like, and can be used for improving the performance of liquid crystal materials. In a first aspect, the present invention provides a liquid crystal compound having a structure as shown in formula I: A formula I; wherein X is selected from O or S; R is selected from any one of halogenated or unsubstituted C1-C12 alkyl, halogenated or unsubstituted C1-C12 alkoxy, halogenated or unsubstituted C3-C10 cycloalkyl, halogenated or unsubstituted C2-C12 alkenyl and halogenated or unsubstituted C2-C12 alkenyloxy; Ring a, ring B are each independently selected from any one of a halogenated or unsubstituted 1, 4-phenylene, a halogenated or unsubstituted 1, 4-cyclohexylene, a halogenated or unsubstituted 1, 4-cyclohexenylene, a halogenated or unsubstituted tetrahydropyranyl, a halogenated or unsubstituted 1, 3-dioxanyl; m is 0,1 or 2, n is 0 or 1, and m, n are not simultaneously 0. In the present invention, the halogenated or unsubstituted alkyl group is preferably linear, wherein "linear" specifically means that all carbon atoms constituting the alkyl group are on the same carbon chain. The halogenated or unsubstituted alkyl group can make the anisotropic arrangement of the above liquid crystal compound more ordered, so that it can have liquid crystal properties. "liquid crystal properties" refers to the ability of a substance to have liquid flowability at a given temperature and the anisotropic ordering of crystalline substances. In the present invention, a halogenated or unsubstituted alkoxy group may be regarded as a structure in which the above-mentioned halogenated or unsubstituted alkyl group is bonded to an oxygen atom (O). The halogenated or unsubstituted alkoxy group is also preferably linear, and the liquid crystal compound having the halogenated or unsubstituted linear alkoxy group can exhibit good liquid crystal properties. In the present invention, the halogenated or unsubstituted alkenyl group may be a linear alkenyl group or a branched alkenyl group, preferably a linear alkenyl group. The above liquid crystal compound having the halogenated or unsubstituted linear alkenyl group is easy to prepare, and it can exhibit good liquid crystal properties. In the present invention, the halogenated or unsubstituted alkenyloxy group may be a linear alkenyloxy group or a branched alkenyloxy group, and the linear alkenyloxy group is preferable. Among them, a halogenated or unsubstituted alkenyloxy group may be regarded as a structure in which a halogenated or unsubstituted alkenyl group is bonded to an oxygen atom. The substituent groups of the invention have proper carbon atom numbers, so that the liquid crystal compound shown in the formula I can be easily prepared, and the dielectric anisotropy value of the liquid crystal compound can be regulated and controlled within a wide range. The alkyl, alkoxy, alkenyl, alkenyloxy groups are all linear unless otherwise specified in the present invention. In the pre