Photosensitive chiral dopant as well as preparation method and application thereof
Photosensitive chiral dopants X or Y are prepared by a simple synthesis process and then blended with liquid crystals in polymers, solving the problems of complex synthesis and high cost of existing photosensitive dopants and realizing the application of highly stable photochromic materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGDONG UNIV OF TECH
- Filing Date
- 2026-01-07
- Publication Date
- 2026-05-12
AI Technical Summary
Existing photosensitive dopants have complex design and synthesis processes, high raw material costs, and poor stability, which affects the practical application of photochromic materials in various fields.
Photosensitive chiral dopants X or Y are synthesized by esterification reaction of isosorbide, p-hydroxybenzoic acid and acid catalyst in a nonpolar organic solvent. The photosensitive dopants X or Y are then blended with liquid crystal and dispersed in polymers to achieve reversible color change.
The preparation process is simple, the raw materials are readily available, and the photochromic material film with photosensitive chiral dopant has high stability and good color reversibility, making it suitable for the preparation of patterned materials.
Smart Images
Figure CN122010972A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of photosensitive organic synthesis technology, and in particular to a photosensitive chiral dopant, its preparation method and application. Background Technology
[0002] Cholesteric liquid crystals (CLCs), as a highly promising representative of smart soft matter, have sparked a widespread and sustained research boom in the field of materials science in recent years. By introducing chiral dopants into a nematic liquid crystal (LC) matrix, the originally linearly arranged liquid crystal molecular chains will undergo regular twisting, thereby forming a periodically helical layered structure, thus obtaining cholesteric liquid crystals.
[0003] In cholesteric liquid crystals, the pitch parameter of the helical structure depends not only on the concentration and molecular structure of the chiral dopant but also dynamically adjusts with changes in environmental conditions. When external stimuli act on the system, changes in intermolecular forces lead to alterations in the helical parameter, thereby triggering significant changes in the macroscopic properties of the liquid crystal material, such as optical and electrical properties. This structure endows cholesteric liquid crystals with highly sensitive environmental response characteristics, enabling them to produce significant changes in response to various external stimuli such as light, heat, electric fields, and mechanical stress. Among the many environmental stimuli, light has particular advantages due to its tunable intensity, polarization, and wavelength availability. Photoresponsive cholesteric liquid crystals, as photochromic materials, have shown excellent research value in fields such as anti-counterfeiting, optical masks, and optical switching molecular devices.
[0004] Currently, various optical switches have been used as dopants in photoresponsive cholesteric liquid crystals, such as azobenzene, spiropyran, diarylethylene, and hydrazone. However, these optical switches suffer from problems such as complex design and synthesis, high cost and difficulty in obtaining raw materials, and poor stability. These defects affect the practical application of photochromic materials in various fields. Summary of the Invention
[0005] This application provides a photosensitive chiral dopant, its preparation method, and its application, aiming to solve the technical problems of existing photosensitive dopants, such as complex design and synthesis processes, high raw material costs, and poor stability.
[0006] To achieve the above objectives, the present application adopts the following technical solution.
[0007] A first aspect of this application provides a photosensitive chiral dopant, the molecular formula of which is shown in formula X or formula Y:
[0008] .
[0009] Preferably, the photosensitive chiral dopant is synthesized using the following process:
[0010]
[0011] ;
[0012] or:
[0013] .
[0014] A second aspect of this application provides a method for preparing the aforementioned photosensitive chiral dopant, comprising:
[0015] S1, isosorbide, p-hydroxybenzoic acid and acid catalyst are dissolved in a nonpolar organic solvent and subjected to esterification reaction, followed by post-treatment to obtain an intermediate;
[0016] S2, the intermediate, 9-anthracarboxylic acid and acid catalyst are dissolved in a nonpolar organic solvent and subjected to esterification reaction. After post-treatment, photosensitive chiral dopant X or photosensitive chiral dopant Y is obtained.
[0017] Preferably, the acid catalyst comprises any one of concentrated hydrochloric acid, concentrated sulfuric acid, phosphoric acid, boric acid, benzenesulfonic acid, or p-toluenesulfonic acid;
[0018] The nonpolar organic solvent includes any one of benzene, toluene, xylene, trimethylbenzene, carbon tetrachloride, or cyclohexane.
[0019] Preferably, the esterification reaction is carried out at a temperature of 120~150℃ and for a reaction time of 24~48h.
[0020] Preferably, the molar ratio of isosorbide, p-hydroxybenzoic acid and acid catalyst in S1 is 1:2~2.2:0.3~0.5.
[0021] Preferably, in S2, when the molar ratio of the intermediate, 9-anthracarboxylic acid, and acid catalyst is 1:2~2.2:0.3~0.5, the product is a photosensitive chiral dopant X;
[0022] When the molar ratio of intermediate, 9-anthracarboxylic acid and acid catalyst is 1~1.2:1:0.3~0.5, the product is photosensitive chiral dopant Y.
[0023] Preferably, the post-processing in S1 includes:
[0024] After esterification, the solvent was evaporated to remove the residue, which was then washed with an alkaline solution until neutral, filtered, and dried. The intermediate was then obtained by silica gel column chromatography.
[0025] The post-processing described in S2 includes:
[0026] After the esterification reaction, the solid phase is collected; the solid phase is washed with an alkaline solution until neutral, washed and dried, and then subjected to silica gel column chromatography to obtain photosensitive chiral dopant X or photosensitive chiral dopant Y.
[0027] Preferably, the alkaline solution includes a sodium carbonate solution or a sodium bicarbonate solution;
[0028] The eluent for silica gel column chromatography described in S1 is a mixture of ethyl acetate and petroleum ether in a volume ratio of 1 to 3:1;
[0029] In S2, the eluent for silica gel column chromatography is a mixture of dichloromethane and petroleum ether in a volume ratio of 10~6:1.
[0030] A third aspect of this application provides the application of the aforementioned photosensitive chiral dopant in the preparation of patterned materials.
[0031] Compared with the prior art, the beneficial effects of this application are as follows:
[0032] This application discloses a photosensitive chiral dopant with an anthracene structure that, by blending with other chiral agents and liquid crystals and dispersing in a polymer, can achieve reversible color-changing response to light within a certain temperature range and wavelength. The preparation process of the photosensitive chiral dopant in this application is simple, and the raw materials are inexpensive and readily available.
[0033] In the photosensitive chiral dopant of this application, since the structural change of anthracene dimerization and depolymerization requires more energy absorption than other photosensitive structural changes, the photochromic material film containing the photosensitive chiral dopant of this application has high stability, its color can be changed and maintained stably for a long time, realizing reversible light-controlled structural color. Attached Figure Description
[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0035] Figure 1 The NMR spectrum of the chiral dopant X prepared in Example 1;
[0036] Figure 2 The NMR spectrum of the chiral dopant Y prepared in Example 2;
[0037] Figure 3 The images show cholesteric liquid crystal film 1 under illumination at 365 nm and 254 nm.
[0038] Figure 4 The images show cholesteric liquid crystal film 2 under illumination at 365 nm and 254 nm.
[0039] Figure 5 This is a physical image of the patterned cholesteric liquid crystal film 2. Detailed Implementation
[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0041] In the following description of this embodiment, the terms "including", "comprising", "having", and "containing" are all open-ended terms, meaning that they include but are not limited to.
[0042] In the following description of this embodiment, the term "and / or" is used to describe the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, B existing alone, and A and B existing simultaneously. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0043] In the following description of this embodiment, the term "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.
[0044] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms "a" and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.
[0045] Those skilled in the art should understand that, in the following description of the embodiments of this application, the sequence of numbers does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0046] Those skilled in the art will understand that the numerical ranges in the embodiments of this application should be understood as each intermediate value between the upper and lower limits of the specifically disclosed range. Each smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this application. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.
[0047] Unless otherwise stated, the technical / scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. While this application describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this application. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.
[0048] In a first aspect, this application provides a photosensitive chiral dopant, the molecular formula of which is shown in formula X or formula Y:
[0049] .
[0050] The photosensitive chiral dopant of this application, by blending with other chiral agents and liquid crystals and dispersing in a polymer, can achieve reversible color change in response to light within a certain temperature range and wavelength, and has high stability.
[0051] The synthesis process of the photosensitive chiral dopant in this application is as follows:
[0052]
[0053] ;
[0054] or:
[0055] .
[0056] Secondly, the preparation method of the photosensitive chiral dopant in this application specifically includes:
[0057] S1, isosorbide, p-hydroxybenzoic acid and acid catalyst are dissolved in a non-polar organic solvent and esterified. After post-treatment, the intermediate is obtained, namely the compound (3) in the synthesis process.
[0058] In this application, the acid catalyst includes any one of concentrated hydrochloric acid, concentrated sulfuric acid, phosphoric acid, boric acid, benzenesulfonic acid, or p-toluenesulfonic acid; the nonpolar organic solvent includes any one of benzene, toluene, xylene, trimethylbenzene, carbon tetrachloride, or cyclohexane.
[0059] In this application, the molar ratio of isosorbide, p-hydroxybenzoic acid and acid catalyst is preferably 1:2~2.2:0.3~0.5; the esterification reaction temperature is 120~150℃ and the reaction time is 24~48h.
[0060] The post-processing described in S1 includes:
[0061] After esterification, the solvent is evaporated to remove the residue, which is then washed with an alkaline solution until neutral, filtered, and dried. The intermediate is then obtained by silica gel column chromatography. The alkaline solution is a sodium carbonate solution or a sodium bicarbonate solution. The eluent for silica gel column chromatography is a mixture of ethyl acetate and petroleum ether in a volume ratio of 1 to 3:1.
[0062] S2, the intermediate, 9-anthracarboxylic acid and acid catalyst are dissolved in a nonpolar organic solvent and subjected to esterification reaction. After post-treatment, photosensitive chiral dopant X or photosensitive chiral dopant Y is obtained.
[0063] In this application, when the molar ratio of the intermediate, 9-anthracarboxylic acid and acid catalyst is 1:2~2.2:0.3~0.5, the product is a photosensitive chiral dopant X; when the molar ratio of the intermediate, 9-anthracarboxylic acid and acid catalyst is 1~1.2:1:0.3~0.5, the product is a photosensitive chiral dopant Y.
[0064] The post-processing described in S2 includes:
[0065] After the esterification reaction, the solid phase is collected; the solid phase is washed with an alkaline solution until neutral, washed, dried, and then subjected to silica gel column chromatography to obtain photosensitive chiral dopant X or photosensitive chiral dopant Y. The alkaline solution is a sodium carbonate solution or a sodium bicarbonate solution; the eluent for silica gel column chromatography is a mixture of dichloromethane and petroleum ether in a volume ratio of 10~6:1.
[0066] The method for preparing photosensitive chiral dopants in this application is simple in process and uses inexpensive and readily available raw materials.
[0067] Compared to common photosensitive structures of chiral agents, the structural change of anthracene dimerization and depolymerization in the photosensitive chiral dopant of this application requires more energy absorption than other photosensitive structural changes, as shown in Table 1. The photochromic material film containing the photosensitive chiral dopant of this application exhibits high stability; its color can be changed and maintained stably for a long time, achieving reversible phototunable structural color.
[0068] Table 1. Reaction energies of common photosensitive structures of chiral agents
[0069]
[0070] Based on this, the photosensitive chiral dopant of this application can be used to prepare patterned materials. For example, the photosensitive chiral dopant of this application can be mixed with nematic liquid crystal to obtain cholesteric liquid crystal, and then the cholesteric liquid crystal can be mixed with a polymer solution to prepare a cholesteric liquid crystal film, thus obtaining a patterned material film with photochromic properties. Under specific wavelength ultraviolet light irradiation, the patterned material film of this application can write and erase target patterns on the film, and can be used in anti-counterfeiting labels and information encryption fields.
[0071] The present application will be further illustrated by the following examples.
[0072] Example 1
[0073] This embodiment provides a method for preparing a photosensitive chiral dopant X, including:
[0074] S1, 34.21 mmol of isosorbide, 71.81 mmol of p-hydroxybenzoic acid, and 10.26 mmol of p-toluenesulfonic acid monohydrate were added to a 250 mL round-bottom flask, followed by 125 mL of toluene. The mixture was heated to 120 °C and refluxed for 36 h to remove water. After the reaction was complete, the toluene was evaporated, and the residue was washed with saturated NaHCO3 solution until neutral. The residue was filtered to obtain a filter cake, dried, and purified by silica gel column chromatography (ethyl acetate: petroleum ether = 2:1) to give the intermediate in 78.3% yield.
[0075] S2, 10.00 mmol of the intermediate, 21.00 mmol of 9-anthracarboxylic acid, and 3.00 mmol of p-toluenesulfonic acid monohydrate were added to a 100 mL round-bottom flask, followed by 50 mL of toluene. The mixture was heated to 120 °C and refluxed for 48 h to remove water. After the reaction was complete, the toluene was evaporated, and the residue was washed with saturated NaHCO3 solution until neutral. The residue was filtered to obtain a filter cake, dried, and purified by silica gel column chromatography (dichloromethane: petroleum ether = 5:1) to give chiral dopant X in 83.3% yield.
[0076] Example 2
[0077] This embodiment provides a method for preparing a photosensitive chiral dopant Y, including:
[0078] S1, 34.21 mmol of isosorbide, 71.81 mmol of p-hydroxybenzoic acid, and 10.26 mmol of p-toluenesulfonic acid monohydrate were added to a 250 mL round-bottom flask, followed by 125 mL of toluene. The mixture was heated to 120 °C and refluxed for 36 h to remove water. After the reaction was complete, the toluene was evaporated, and the residue was washed with saturated NaHCO3 solution until neutral. The residue was filtered to obtain a filter cake, dried, and purified by silica gel column chromatography (ethyl acetate: petroleum ether = 2:1) to give the intermediate in 78.3% yield.
[0079] S2, 12.00 mmol of the intermediate, 10.00 mmol of 9-anthracarboxylic acid, and 3.00 mmol of p-toluenesulfonic acid monohydrate were added to a 100 mL round-bottom flask, followed by 50 mL of toluene. The mixture was heated to 120 °C and refluxed for 24 h to remove water. After the reaction was complete, the toluene was evaporated, and the residue was washed with saturated NaHCO3 solution until neutral. The residue was filtered to obtain a filter cake, dried, and purified by silica gel column chromatography (dichloromethane: petroleum ether = 10:1) to give chiral dopant X in 81.6% yield.
[0080] Example 3
[0081] This embodiment provides a method for preparing a photosensitive chiral dopant X, including:
[0082] S1, 34.21 mmol isosorbide, 71.81 mmol p-hydroxybenzoic acid, and 1 mL concentrated sulfuric acid were added to a 250 mL round-bottom flask, followed by 125 mL toluene. The mixture was heated to 120 °C and refluxed for 36 h to remove water. After the reaction was complete, the toluene was evaporated, and the residue was washed with saturated NaHCO3 solution until neutral. The residue was filtered to obtain a filter cake, dried, and purified by silica gel column chromatography (ethyl acetate: petroleum ether = 2:1) to give the intermediate in 76.2% yield.
[0083] S2, 10.00 mmol of the intermediate, 21.00 mmol of 9-anthracarboxylic acid, and 0.5 mL of concentrated sulfuric acid were added to a 100 mL round-bottom flask, followed by 50 mL of toluene. The mixture was heated to 120 °C and refluxed for 48 h to remove water. After the reaction was complete, the toluene was evaporated, and the residue was washed with saturated NaHCO3 solution until neutral. The residue was filtered to obtain a filter cake, dried, and purified by silica gel column chromatography (dichloromethane: petroleum ether = 5:1) to give chiral dopant X in 78.8% yield.
[0084] Example 4
[0085] This embodiment provides a method for preparing a photosensitive chiral dopant Y, including:
[0086] S1, 34.21 mmol isosorbide, 71.81 mmol p-hydroxybenzoic acid, and 1 mL concentrated sulfuric acid were added to a 250 mL round-bottom flask, followed by 125 mL toluene. The mixture was heated to 120 °C and refluxed for 36 h to remove water. After the reaction was complete, the toluene was evaporated, and the residue was washed with saturated NaHCO3 solution until neutral. The residue was filtered to obtain a filter cake, dried, and purified by silica gel column chromatography (ethyl acetate: petroleum ether = 2:1) to give the intermediate in 76.2% yield.
[0087] S2, 12.00 mmol of the intermediate, 10.00 mmol of 9-anthracarboxylic acid, and 0.5 mL of concentrated sulfuric acid were added to a 100 mL round-bottom flask, followed by 50 mL of toluene. The mixture was heated to 120 °C and refluxed for 24 h to remove water. After the reaction was complete, the toluene was evaporated, and the residue was washed with saturated NaHCO3 solution until neutral. The residue was filtered to obtain a filter cake, dried, and purified by silica gel column chromatography (dichloromethane:petroleum ether = 10:1) to give chiral dopant X in 75.4% yield.
[0088] The NMR spectrum of the chiral dopant X prepared in Example 1 is shown below. Figure 1 As shown. From Figure 1 The NMR results of the chiral hybrid agent X are correct, indicating that it has been successfully prepared.
[0089] The NMR spectrum of the chiral dopant Y prepared in Example 2 is shown below. Figure 2 As shown. From Figure 2 The NMR results for the chiral dopant Y are correct, indicating that it has been successfully prepared.
[0090] Example 5
[0091] This embodiment provides a patterned material thin film, which is a cholesteric liquid crystal thin film including a chiral dopant X, and its preparation method includes:
[0092] S1, weigh 500 mg of nematic liquid crystal 4-cyano-4-octylbiphenyl and mix it with 20 mg of chiral dopant X, add it to chloroform to prepare a solution, and sonicate it to mix thoroughly; then, by heating at a constant temperature, the chloroform is evaporated to obtain a cholesteric liquid crystal solution.
[0093] Mix 2g of polyvinyl alcohol (PVA) and 18g of water, heat to 80℃ and stir for 12 hours to obtain a homogeneous PVA solution.
[0094] S2, mix 100 μL of cholesteric phase liquid crystal solution and 1 mL of PVA solution, and stir on a constant speed stirring table for 12 h to obtain a white precursor emulsion;
[0095] S3, the precursor emulsion was placed on a scraper with a groove thickness of 0.1 μm, the bottom temperature was set to 40 ℃, and the scraping speed was 50 mm / s; then it was annealed on a hot stage at 80 ℃ for 5 min and then removed to obtain the cholesteric phase liquid crystal film 1.
[0096] Figure 3 The images show cholesteric liquid crystal film 1 under illumination at 365 nm and 254 nm. At 25 °C, after 1 min of illumination at 365 nm, the film color changed from blue to red; after 30 min of illumination at 254 nm, the film color changed back from red to blue.
[0097] Example 6
[0098] This embodiment provides a patterned material thin film, which is a cholesteric liquid crystal thin film including a chiral dopant Y, and its preparation method includes:
[0099] S1, weigh 500 mg of nematic liquid crystal 4-cyano-4-octylbiphenyl and mix it with 20 mg of chiral dopant Y, add it to chloroform to prepare a solution, and sonicate it to mix thoroughly; then heat it at a constant temperature to evaporate the chloroform and obtain a cholesteric liquid crystal solution.
[0100] Mix 2g of polyvinyl alcohol (PVA) and 18g of water, heat to 80℃ and stir for 12 hours to obtain a homogeneous PVA solution.
[0101] S2, mix 100 μL of cholesteric phase liquid crystal solution and 1 mL of PVA solution, and stir on a constant speed stirring table for 12 h to obtain a white precursor emulsion;
[0102] S3, the precursor emulsion was placed on a scraper with a groove thickness of 0.1 μm, the bottom temperature was set at 40 ℃, and the scraping speed was 50 mm / s; then it was annealed on a hot stage at 80 ℃ for 5 min and then removed to obtain cholesteric liquid crystal film 2.
[0103] Figure 4 The images show cholesteric liquid crystal film 2 under illumination at 365 nm and 254 nm. At 25 °C, after 1 min of illumination at 365 nm, the film color changed from blue to green; after 30 min of illumination at 254 nm, the film color changed back from green to blue.
[0104] A mask with patterns of "2025" and "square" was placed on the cholesteric liquid crystal film 2. After 1 minute of illumination with 365nm light, the corresponding patterns appeared on the film. The actual image is shown below. Figure 5 As shown. By preparing a thin film pattern on the surface of an item and covering it with the same color pigment, the pattern on the thin film can appear and disappear under ultraviolet light of a specific wavelength, thereby achieving anti-counterfeiting or information encryption functions.
[0105] Although this application has been described in detail in this specification with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, such modifications or improvements made without departing from the spirit of this application are all within the scope of protection claimed in this application.
Claims
1. A photosensitive chiral dopant, characterized in that, Its molecular formula is shown as formula X or formula Y: 。 2. The photosensitive chiral dopant according to claim 1, characterized in that, Its synthesis process is as follows: ； ； or: 。 3. The method for preparing the photosensitive chiral dopant according to claim 2, characterized in that, include: S1, isosorbide, p-hydroxybenzoic acid and acid catalyst are dissolved in a nonpolar organic solvent and subjected to esterification reaction, followed by post-treatment to obtain an intermediate; S2, the intermediate, 9-anthracarboxylic acid and acid catalyst are dissolved in a nonpolar organic solvent and subjected to esterification reaction. After post-treatment, photosensitive chiral dopant X or photosensitive chiral dopant Y is obtained.
4. The preparation method according to claim 3, characterized in that, The acid catalyst includes any one of concentrated hydrochloric acid, concentrated sulfuric acid, phosphoric acid, boric acid, benzenesulfonic acid, or p-toluenesulfonic acid; The nonpolar organic solvent includes any one of benzene, toluene, xylene, trimethylbenzene, carbon tetrachloride, or cyclohexane.
5. The preparation method according to claim 3, characterized in that, The esterification reaction is carried out at a temperature of 120~150℃ for a reaction time of 24~48h.
6. The preparation method according to claim 3, characterized in that, The molar ratio of isosorbide, p-hydroxybenzoic acid and acid catalyst in S1 is 1:2~2.2:0.3~0.
5.
7. The preparation method according to claim 3, characterized in that, In S2, when the molar ratio of the intermediate, 9-anthracarboxylic acid, and acid catalyst is 1:2~2.2:0.3~0.5, the product is the photosensitive chiral dopant X; When the molar ratio of intermediate, 9-anthracarboxylic acid and acid catalyst is 1~1.2:1:0.3~0.5, the product is photosensitive chiral dopant Y.
8. The preparation method according to claim 3, characterized in that, The post-processing described in S1 includes: After esterification, the solvent was evaporated to remove the residue, which was then washed with an alkaline solution until neutral, filtered, and dried. The intermediate was then obtained by silica gel column chromatography. The post-processing described in S2 includes: After the esterification reaction, the solid phase is collected; the solid phase is washed with an alkaline solution until neutral, washed and dried, and then subjected to silica gel column chromatography to obtain photosensitive chiral dopant X or photosensitive chiral dopant Y.
9. The preparation method according to claim 8, characterized in that, The alkaline solution includes sodium carbonate solution or sodium bicarbonate solution; The eluent for silica gel column chromatography described in S1 is a mixture of ethyl acetate and petroleum ether in a volume ratio of 1 to 3:1; In S2, the eluent for silica gel column chromatography is a mixture of dichloromethane and petroleum ether in a volume ratio of 10~6:
1.
10. The application of the photosensitive chiral dopant according to claim 1 in the preparation of patterned materials.