A thermally enhanced circularly polarized luminescent supramolecular gel material

Abstract

The application provides a kind of thermal enhancement circularly polarized fluorescence (CPL) supramolecular gel material, which is obtained by forming a complex of chiral bridged ring compound and metal ions, and then reacting with fluorescent dye molecules. The raw materials are biologically friendly and widely available, and do not require the use of reaction aids and organic reagents. The reaction conditions are mild, and do not require special conditions and equipment. The preparation method is simple, green and environmentally friendly. The prepared supramolecular gel has excellent thermal enhancement circularly polarized fluorescence and mechanical properties. Compared with ordinary circularly polarized fluorescence materials, the thermal stability is greatly improved, overcoming the shortcomings of general CPL materials that are not resistant to high temperature. It can meet the requirements of industrial production and use, and is conducive to popularization and application.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of circularly polarized luminescence, and particularly relates to circularly polarized luminescence performance of a supramolecular gel material, in particular, to a supramolecular gel material with enhanced thermotropic circularly polarized fluorescence. BACKGROUND

[0002] Circularly polarized luminescence (CPL) materials have attracted much attention due to their wide applications in optoelectronic devices, information storage and processing, 3D display, and chiral optical materials. CPL materials require both fluorescence and chirality, so various chiral fluorescent molecules have been designed. However, chiral fluorescent molecules need complex synthesis and have low yield. In recent years, it has been found that chiral transmission through supramolecular assembly is a good method for preparing supramolecular CPL materials. Supramolecular CPL materials can be simply and effectively prepared through co-assembly between achiral dye molecules and chiral substrates. Moreover, chiral supramolecular assemblies can take advantage of assembly amplification of asymmetric factors, which helps to improve the efficiency of CPL materials and has great significance for the practical application of CPL materials.

[0003] However, the increase in ambient temperature will lead to disassembly of the assembly or transformation of the assembly from large to small, which is a problem that cannot be bypassed in the development of supramolecular CPL materials. Because CPL requires highly directional arrangement of fluorescent chromophores, disassembly or reduction of the assembly is not conducive to the generation of CPL. In most cases, due to the greatly accelerated thermal motion, the assembly tends to become unstable at elevated temperatures. For example, at elevated temperatures, worm-like micelles can transform into spherical structures, and lamellar tubular structures can change into vesicles. Compared with one-dimensional large assemblies, spherical small assemblies have poorer ability to orient fluorescent molecules due to their greater curvature. Therefore, disassembly of the self-assembly structure often leads to weakening or even disappearance of CPL, even if the fluorescence of the system is not greatly affected.

[0004] It can be seen that CPL materials will inevitably encounter the situation of device heating and temperature rise in the application process, so it is crucial to develop CPL materials that resist thermal effects. However, so far this is still a great challenge. SUMMARY

[0005] To solve the above problems, the present application provides a kind of thermal enhanced circularly polarized luminescence (CPL) supramolecular gel material, by chiral steroid compound and metal ion form complex, again with fluorescent dye molecule and obtain supramolecular gel material.The raw material is biologically friendly, green, non-toxic, widely available, without using reaction aids and organic reagents, reaction condition is mild, without special conditions and equipment, preparation method is simple, green and environmental protection.Supramolecular gel prepared has excellent thermal enhanced circularly polarized fluorescence and mechanical properties, compared with ordinary circularly polarized fluorescent material, thermal stability is greatly improved, realizes high intensity and persistent CPL emission, so as to complete the present application.

[0006] The present application aims to provide a kind of supramolecular gel.It is by chiral bridge ring compound and metal ion form complex, again with fluorescent dye molecule and obtain;The chiral bridge ring compound is coordinated with metal ion by carbonyl, and the fluorescent dye molecule is non-chiral fluorescent dye molecule.

[0007] The chiral bridge ring compound is selected from steroid compound, preferably one or more of cholic acid substances, more preferably one or more of cholic acid, sodium cholate and sodium deoxycholate, such as sodium cholate.

[0008] The metal ion is selected from one or more of alkaline earth metal ions, rare earth metal ions and transition metal ions, preferably one or more of calcium ions, lanthanum ions and europium ions, more preferably calcium ions, such as Ca 2+ .

[0009] The non-chiral fluorescent dye molecule is selected from linear dye molecule, preferably selected from stilbene dye, such as 4,4'-bis (2-sulfonic acid styryl) biphenyl disodium salt (CBS), azo dye, such as direct yellow 4, direct yellow 96, methyl red, methyl orange, methyl yellow, benzothiazole dye, such as thioflavin T (ThT), acridine dye, such as acridine yellow, acridine orange, one or more of more preferably CBS, direct yellow 4, direct yellow 96, methyl red, methyl orange, methyl yellow, acridine yellow, acridine orange, such as CBS.

[0010] The present application also aims to provide a preparation method of the supramolecular gel, which comprises dissolving raw materials of chiral bridge ring compound, metal salt and fluorescent dye in a solvent.

[0011] Step 1, dissolving chiral bridge ring compound in solvent to obtain chiral bridge ring compound solution;

[0012] Step 2, dissolving metal salt in solvent to obtain metal salt solution;

[0013] Step 3, dissolving fluorescent dye in solvent to obtain dye solution.

[0014] Step 4, mixing the chiral bridged ring compound solution, the metal salt solution and the dye solution, and standing to obtain the supramolecular gel.

[0015] Still another purpose of the present application is to provide the use of the supramolecular gel as a thermally enhanced circularly polarized luminescence (CPL) material.

[0016] The supramolecular gel provided in the present application and its use as a thermally enhanced CPL material have the following beneficial effects:

[0017] (1) The present application uses a steroid compound and a metal salt as raw materials, and obtains a gel material with thermally enhanced CPL properties through coordination supramolecular assembly. The gel itself has a single chiral morphology, and can induce various dyes to produce high-intensity CPL.

[0018] (2) The steroid compound in the present application is a natural chiral molecule, which is green and environmentally friendly, and has no absorption in the ultraviolet-visible region, and will not interfere with the circular dichroism chiral signal of the system.

[0019] (3) The supramolecular gel in the present application has a CPL intensity that does not decrease but increases from 20℃ to 50℃, and the g value can be increased from 0.04 to 0.1, and the luminescent efficiency reaches a surprising 90%. After temperature rise, the coordination between the chiral bridged ring compound and the metal ion is enhanced, so that the supramolecular gel assembly and the chirality are also enhanced, and the circularly polarized fluorescence (CPL) property is also obviously improved, and the stability can be maintained during the temperature rise and fall process. The assembly system aggregate morphology is highly ordered, and the storage modulus G' and the loss modulus G" are greatly improved.

[0020] (4) The preparation process of the thermally enhanced CPL supramolecular gel does not require harsh preparation conditions and special equipment, the material sources are wide, the production cost is low, it is conducive to large-scale production, the use method is simple, and the application is easy to popularize. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The appearance of the SC-Ca-CBS gel prepared in Example 1 of the present application and the blue fluorescence under 365nm excitation are shown.

[0022] Figure 2 The high-resolution TEM image of the SC-Ca-CBS gel prepared in Example 1 of the present application is shown.

[0023] Figure 3 The SEM image of the SC-Ca-CBS gel prepared in Example 1 of the present application is shown.

[0024] Figure 4 The CLSM image of the SC-Ca-CBS gel prepared in Example 1 of the present application is shown.

[0025] Figure 5 CPL and fluorescence curves obtained from the temperature variation test of the SC-Ca-CBS gel prepared in Example 1 of the present application are shown in the figure;

[0026] Figure 6 g value curves of circularly polarized fluorescence obtained from the temperature variation test of the SC-Ca-CBS gel prepared in Example 1 of the present application are shown in the figure;

[0027] Figure 7 g value stability curves of the SC-Ca-CBS gel prepared in Example 1 of the present application under the temperature variation cycle of heating-cooling-heating are shown in the figure;

[0028] Figure 8 tendency graphs of the energy dissipation modulus G" and the energy storage modulus G' of the SC-Ca-CBS gel prepared in Example 1 of the present application before and after heating are shown in the figure;

[0029] Figure 9 high resolution TEM images obtained from the test of the SC-Ca-CBS gel prepared in Example 1 of the present application after heating are shown in the figure;

[0030] Figure 10 XRD spectra of the SC-Ca gel prepared in Example 1 of the present application before and after adding CBS are shown in the figure;

[0031] Figure 11 two-dimensional nuclear magnetic resonance spectra of the SC-Ca-CBS gel prepared in Example 1 of the present application are shown in the figure;

[0032] Figure 12 temperature variation infrared spectra of the SC-Ca-CBS gel prepared in Example 1 of the present application are shown in the figure;

[0033] Figure 13 O 1s electron binding energy change graphs of the XPS spectra of the SC-Ca gel prepared in Example 1 of the present application before and after heating are shown in the figure;

[0034] Figure 14 Ca 2p electron binding energy change graphs of the XPS spectra of the SC-Ca gel prepared in Example 1 of the present application before and after heating are shown in the figure. DETAILED DESCRIPTION

[0035] The present application will be described in detail below through specific embodiments, and the features and advantages of the present application will become more apparent with these descriptions.

[0036] The thermally enhanced circularly polarized luminescence (CPL) gel material provided in the present application is prepared from steroidal compounds, metal salts and dyes in a solvent, especially an aqueous solvent. The raw materials are biologically friendly and widely available, and do not require the use of reaction aids and organic reagents. The reaction conditions are mild, and do not require special conditions and equipment. The preparation method is simple and environmentally friendly. The prepared supramolecular hydrogel has excellent thermally enhanced circularly polarized fluorescence and mechanical properties. Compared with ordinary circularly polarized fluorescent materials, the thermal stability is greatly improved, overcoming the shortcomings of general CPL materials that are not resistant to high temperatures, and can meet the requirements of industrial production and use, facilitating the promotion of production and application.

[0037] The present application provides a supramolecular gel in the first aspect. It is obtained by forming a complex of a chiral bridged ring compound and metal ions, and then reacting with a fluorescent dye molecule. The chiral bridged ring compound is coordinated with metal ions through a carbonyl group, and the fluorescent dye molecule is an achiral fluorescent dye molecule.

[0038] The chiral bridged ring compound is selected from steroidal compounds, preferably one or more of cholic acid substances, and more preferably one or more of cholic acid, sodium cholate and sodium deoxycholate, such as sodium cholate.

[0039] The metal ion is selected from one or more of alkaline earth metal ions, rare earth metal ions and transition metal ions, preferably one or more of calcium ions, lanthanum ions and europium ions, and more preferably calcium ions, such as Ca 2+ .

[0040] In the present application, the chiral bridged ring compound and the metal ion can be coordinated to form a supramolecular assembly with a single helical structure. It has the property of thermally enhanced circularly polarized luminescence. After the temperature rises, the coordination of the chiral bridged ring compound and the metal ion is enhanced, so that the supramolecular gel assembly and the chirality are also enhanced, and the circularly polarized fluorescence (CPL) property is also significantly improved. The asymmetric factor g is increased to 0.1, and the stability can be maintained during the temperature rise and fall process. The assembly system aggregate morphology is highly ordered, and the storage modulus G' and loss modulus G" are greatly improved. The above properties are not possessed by general supramolecular hydrogel circularly polarized luminescence, and have great significance for practical application.

[0041] The achiral fluorescent dye molecule is selected from linear dye molecules, preferably from stilbene dyes such as 4,4'-bis(2-sulfostyryl)diphenyl disodium salt (CBS), azo dyes such as Direct Yellow 4, Direct Yellow 96, methyl red, methyl orange, methyl yellow, benzothiazole dyes such as thioflavin T (ThT), acridine dyes such as acridine yellow, acridine orange, one or more of them, more preferably CBS, Direct Yellow 4, Direct Yellow 96, methyl red, methyl orange, methyl yellow, acridine yellow, acridine orange, such as CBS. The supramolecular gel in the present application is obtained by interaction with the fluorescent dye molecule, thereby obtaining a supramolecular gel material with corresponding fluorescent properties.

[0042] The supramolecular gel material is prepared by dispersing chiral bridged ring compounds, metal ions and fluorescent dyes in a solvent, preferably the gel is prepared in a solvent selected from aqueous solvents or alcohol solvents, preferably aqueous solvents. The aqueous solvent is industrial water, distilled water, deionized water or ultrapure water, preferably distilled water, deionized water or ultrapure water, more preferably ultrapure water.

[0043] In the present application, the chiral bridged ring compound is selected from steroids, which is a special natural product with a molecular parent structure containing a cyclopentane fused to a phenanthrene skeleton, and is widely used. Cholic acid is a naturally abundant sterol, which is the main bile acid produced in the liver, usually conjugated with glycine or taurine, which helps fat absorption and cholesterol excretion. It exists in the bile of cattle, sheep and pigs and can be naturally extracted. Cholic acid has carboxyl or carbonyl groups and can complex with metal ions. In the present application, cholic acid is used as a raw material for preparing heat-enhanced CPL gel materials, which is widely available and low in price.

[0044] The second aspect of the present application provides a preparation method of the supramolecular gel, which comprises dissolving raw materials including chiral bridged ring compounds, metal salts and fluorescent dyes in a solvent.

[0045] The solvent is an aqueous solvent or an alcohol solvent, preferably an aqueous solvent. The aqueous solvent is industrial water, distilled water, deionized water or ultrapure water, preferably distilled water, deionized water or ultrapure water, more preferably ultrapure water.

[0046] The chiral bridged ring compound, metal salt and fluorescent dye are specifically as described in the first aspect.

[0047] The method specifically comprises the following steps:

[0048] Step 1, dissolving the chiral bridged ring compound in the solvent to obtain a chiral bridged ring compound solution.

[0049] The molar concentration of the chiral bridged ring compound solution is 15-60 mM, preferably 20-40 mM, and more preferably 20-25 mM, such as 20 mM. The dissolving temperature is 15-35℃, preferably 20-30℃. The concentration of the chiral bridged ring compound solution is too high to further improve the CPL enhancement effect, and the subsequent gelation is slow when the concentration is too low.

[0050] Step 2, dissolving the metal salt in a solvent to obtain a metal salt solution.

[0051] The metal salt is added to water, stirred and mixed, and dissolved to obtain a metal salt solution. The dissolving temperature is 15-35℃, preferably 20-30℃. The concentration of the metal salt is 15-60 mM, preferably 20-40 mM, and more preferably 20-25 mM, such as 20 mM, in terms of the molar concentration of the metal element. Similarly, the concentration of the metal salt solution is too high to have no effect on the CPL enhancement, and the subsequent gelation is slow when the concentration is too low.

[0052] Step 3, dissolving the fluorescent dye in a solvent to obtain a dye solution.

[0053] The dye is added to the solvent, stirred and mixed, and dissolved in water to obtain a dye solution. The dissolving temperature is 15-35℃, preferably 20-30℃.

[0054] The concentration of the dye solution is 0.001-10 mM, preferably 0.005-5 mM, and more preferably 0.01-1 mM, such as 0.1 mM. The quantum yield is high when the concentration of the dye is within the above range, and the quantum yield is the highest when the concentration is 0.1 mM. The quantum yield is reduced when the concentration is too high, and the quantum yield of the supramolecular gel obtained subsequently is almost not improved and the circularly polarized fluorescence intensity is reduced when the concentration is too low.

[0055] Step 4, mixing the chiral bridged ring compound solution, the metal salt solution and the dye solution, and standing to obtain a supramolecular gel.

[0056] The mixing temperature is 15-35℃, preferably 20-30℃.

[0057] The third aspect of the present application provides the use of the supramolecular gel as a circularly polarized luminescence (CPL) material with heat enhancement.

[0058] Preferably, the supramolecular gel is excited under 365 nm excitation light and emits blue fluorescence with a wavelength of 430 nm.

[0059] The luminescent efficiency of the supramolecular gel is greater than 60%, preferably greater than 75%, and more preferably greater than or equal to 90%.

[0060] The use temperature of the supramolecular hydrogel as a heat-enhanced circularly polarized luminescence (CPL) material is 10-70℃, preferably 15-60℃, and more preferably 20-50℃.

[0061] The supramolecular gel material provided in the present application is biologically friendly, green, non-toxic, and has a wide source, does not need to use reaction aids and toxic and harmful organic reagents, has a mild reaction condition, does not need special conditions and equipment, has a simple and green preparation method, and has excellent heat-enhanced circularly polarized fluorescence and mechanical properties. Compared with ordinary circularly polarized fluorescent materials, the heat stability is greatly improved, the defect that general CPL materials are not resistant to high temperature is overcome, the requirements of industrial production and use can be met, and the production and application are conducive to popularization.

[0062] Embodiment

[0063] Embodiment 1

[0064] At room temperature, 0.861 g of sodium cholate was dissolved in 20 mL of ultrapure water to prepare a 100 mM sodium cholate solution. 0.4723 g of calcium nitrate was dissolved in 20 mL of ultrapure water to prepare a 100 mM calcium nitrate solution. 0.05625 g of CBS was dissolved in 5 mL of ultrapure water to prepare a 20 mM CBS solution. Among them, the sodium cholate is purchased from Bailingwei, the calcium nitrate is purchased from Maikelin, and the CBS is purchased from Aladdin.

[0065] 0.4 mL of sodium cholate, 0.4 mL of calcium nitrate, 0.01 mL of CBS, and 1.19 mL of ultrapure water were mixed, and after shaking, a clear and transparent mixed solution was obtained. After standing at 25℃ for 1 h, a transparent SC-Ca-CBS gel that does not flow when inverted was obtained (as shown in Figure 1 the left figure).

[0066] Experimental Example

[0067] Experimental Example 1

[0068] The SC-Ca-CBS gel prepared in Embodiment 1 was subjected to fluorescence excitation test, and the experimental method was as follows: a 365 nm ultraviolet lamp was used for excitation, and the sample emitted blue fluorescence, as shown in Figure 1 the right figure.

[0069] Experimental Example 2

[0070] After the SC-Ca-CBS gel prepared in Embodiment 1 was sampled, transmission electron microscopy (TEM) test was performed, and the TEM test graph is as shown in Figure 2 .

[0071] As can be seen from Figure 2 , the SC-Ca-CBS gel is a three-dimensional network structure composed of a single right-handed helix. This regular chiral structure explains the efficient chiral transmission of the material.

[0072] Experimental Example 3

[0073] The SC-Ca-CBS gel prepared in Example 1 was sampled and subjected to scanning electron microscope (SEM) test, and the SEM test image is shown in Figure 3 .

[0074] As can be seen from Figure 3 , the SC-Ca-CBS gel is a three-dimensional network structure composed of a single right-handed helix. This regular chiral structure explains the high efficient chiral transfer of the material.

[0075] Experimental Example 4

[0076] The SC-Ca-CBS gel prepared in Example 1 was sampled and subjected to confocal laser scanning microscope (CLSM) test, and the CLSM test image is shown in Figure 4 .

[0077] The absolute fluorescence quantum yield of the sample was tested by integrating sphere method. The excitation wavelength of the sample was 370 nm, the emission spectrum collection range was 400-700 nm, and the test was performed on Edinburgh FLS980 steady-state transient fluorescence / phosphorescence spectrometer (77-500K) instrument.

[0078] As can be clearly seen from Figure 4 , the luminescent fibers of the SC-Ca-CBS gel, indicating that the dye has been uniformly dispersed in the assembly. The test obtained a quantum yield (luminescent efficiency) as high as 90%.

[0079] Experimental Example 5

[0080] The SC-Ca-CBS gel prepared in Example 1 was subjected to variable temperature circularly polarized fluorescence (CPL) and variable temperature fluorescence test, and the test image is shown in Figure 5 .

[0081] As can be seen from the CPL test results of Figure 5 , the CPL greatly increased from 200 mdeg to 900 mdeg as the temperature increased from 293 K to 323 K. The fluorescence slightly weakened as the temperature increased.

[0082] Experimental Example 6

[0083] The circularly polarized fluorescence (CPL) and the corresponding asymmetry factor (g) of the SC-Ca-CBS gel prepared in Example 1 were tested during the temperature increasing process, and the test results are shown in Figure 6 . The CPL greatly increased as the temperature increased, and the g value also increased from 0.04 at 293 K to 0.1 at 323 K.

[0084] Experimental Example 7

[0085] The SC-Ca-CBS gel prepared in Example 1 was subjected to temperature- rising and temperature-lowering circularly polarized fluorescence (CPL) and corresponding asymmetric factor (g), as shown in Figure 7 With the temperature rising, the CPL greatly increased, and the g value also increased from 0.04 at 293 K to 0.1 at 323 K. When the temperature was raised to 353 K, lowered to 293 K, and then raised to 323 K again, the g value did not decrease at all, which proved that the prepared hydrogel had thermal stability and durability of CPL, and could meet the actual application.

[0086] Experimental Example 8

[0087] The rheological properties of the SC-Ca-CBS gel prepared in Example 1 were measured using a ThermoHaake RS300 rheometer. The test method was as follows: the SC-Ca-CBS gel was placed between a 35 mm diameter bottom plate and a cone plate, and the temperature was measured by a Pheonix water bath through a temperature control program. The test results are shown in Figure 8

[0088] As can be seen from Figure 8 , the storage modulus G' of the prepared SC-Ca-CBS gel is greater than the loss modulus G", which confirms that it has the properties of a gel. The storage modulus G' and the loss modulus G" are both increased by more than ten times when the temperature is raised from 293 K (about 20°C) to 323 K (about 50°C).

[0089] Experimental Example 9

[0090] The SC-Ca-CBS gel prepared in Example 1 was heated to 323 K and then sampled for transmission electron microscopy (TEM) test, and the TEM test diagram is shown in Figure 9

[0091] As can be seen from Figure 9 , after heating, the helix of the SC-Ca-CBS gel is obviously thickened and lengthened, and is obviously highly oriented and arranged in parallel. This regular chiral structure leads to a higher efficient chiral transfer of the material compared to the normal temperature, and thus has a higher asymmetric factor.

[0092] Experimental Example 10

[0093] The SC-Ca gel was prepared according to the method of Example 1, except that no CBS solution was added.

[0094] The SC-Ca gel and the SC-Ca-CBS gel prepared in Example 1 were tested using X-ray diffraction (XRD).

[0095] As can be seen from Figure 10 ​​The XRD pattern of the dye added sample shows no change in the peak position, which indicates that the addition of the dye does not affect the arrangement of the cholic acid and calcium complex skeleton.

[0096] Example 11

[0097] The SC-Ca-CBS gel prepared in Example 1 was tested using two-dimensional nuclear magnetic resonance, and the test results are shown in Figure 11 The two-dimensional nuclear magnetic resonance spectrum shows that the solubilization site of the CBS is in the hydrophobic microregion of the sodium cholate. Figure 11

[0098] Example 12

[0099] As can be seen from Example 10, the trace amount of dye molecules does not affect the skeleton structure of the cholic acid and calcium ion complex. Therefore, in order to study the coordination of cholic acid and calcium ions, the SC-Ca gel was prepared according to the method of Example 1, with the only difference being that the CBS solution was not added.

[0100] The SC-Ca gel prepared was tested by variable temperature infrared, and the spectrum is shown in Figure 12 At room temperature (298K), the carboxyl group is at 1424 and 1540 cm -1 (Δν is 116 cm -1 ), which are symmetric and asymmetric stretching vibration peaks, and after heating to 323K, they are moved to 1420 cm -1 , 1555 cm -1 (Δν is 135 cm -1 ). This indicates that after heating, the coordination is enhanced, and thus the assembly and chirality are enhanced.

[0101] Example 13

[0102] As can be seen from Example 10, the trace amount of dye molecules does not affect the skeleton structure of the cholic acid and calcium ion complex. Therefore, in order to study the change of O1s electron binding energy with temperature in the coordination of cholic acid and calcium ions, the SC-Ca gel was prepared according to the method of Example 1, with the only difference being that the CBS solution was not added.

[0103] The SC-Ca gel prepared was tested by variable temperature infrared, and the spectrum is shown in Figure 13 After heating, the O1s electron binding energy increases by 0.2 eV. This indicates that after heating, the coordination is enhanced, and thus the assembly and chirality are enhanced.

[0104] Example 14

[0105] ​From Example 10, it is known that the trace amount of dye molecules does not affect the skeleton structure of the cholic acid and calcium ion complex. Therefore, in order to study the change of the 2p electron binding energy of Ca in the coordination of cholic acid and calcium ion with temperature, SC-Ca gel was prepared according to the method of Example 1, with the only difference being that the CBS solution was not added.

[0106] The XPS spectra of SC-Ca gel were tested at temperatures of 298 K and 323 K, respectively, as shown in Figure 4. Figure 14 After heating, the 2p electron binding energy of Ca was reduced by 0.5 eV. This indicates that after heating, the coordination is enhanced, and thus the assembly and chirality are enhanced.

[0107] The above detailed description of the application in conjunction with the specific embodiments and / or exemplary examples and the accompanying drawings is not to be understood as limiting the application. It is understood by those skilled in the art that various equivalent substitutions, modifications or improvements can be made to the technical solutions and embodiments of the application without departing from the spirit and scope of the application, and these all fall within the scope of the application. The scope of protection of the application is subject to the appended claims.

Claims

1. A supramolecular gel, characterized in that, The gel is obtained by forming a complex of a chiral bridged ring compound with metal ions, and then reacting with a fluorescent dye molecule; the chiral bridged ring compound is coordinated with metal ions through a carbonyl group, and the fluorescent dye molecule is an achiral fluorescent dye molecule, The chiral bridged ring compound is sodium cholate; The metal ion is calcium ion; The achiral fluorescent dye molecule is 4,4'-bis(2-sulfostyryl) biphenyl disodium salt (CBS).

2. A process for the preparation of a supramolecular gel according to claim 1, characterized in that, The method includes dissolving raw materials of chiral bridged ring compounds, metal salts and fluorescent dyes in a solvent for preparation; The solvent is selected from aqueous solvent or alcohol solvent; The method specifically includes the following steps: Step 1, dissolving the chiral bridged ring compound in the solvent to obtain a chiral bridged ring compound solution; Step 2, dissolving the metal salt in the solvent to obtain a metal salt solution; Step 3, dissolving the fluorescent dye in the solvent to obtain a dye solution; Step 4, mixing the chiral bridged ring compound solution, the metal salt solution and the dye solution, and standing to obtain the supramolecular gel.

3. The method of claim 2, wherein, In step 1, the solvent is aqueous solvent, and the molar concentration of the chiral bridged ring compound solution is 15-60 mM.

4. The method of claim 3, wherein, In step 1, the molar concentration of the chiral bridged ring compound solution is 20-40 mM.

5. The method according to claim 2, characterized in that In step 2, the concentration of the metal salt is 15-60 mM.

6. The method of claim 5, wherein, In step 2, the concentration of the metal salt is 20-40 mM.

7. The method of claim 2, wherein, In step 3, the concentration of the dye solution is 0.001-10 mM.

8. The method of claim 7, wherein, In step 3, the concentration of the dye solution is 0.005-5 mM.

9. Use of the supramolecular gel according to claim 1, characterized in that, The supramolecular gel is a circularly polarized luminescent material for thermal enhancement; the luminescent efficiency of the supramolecular gel is greater than 60%.

10. Use according to claim 9, characterized in that, The luminescent efficiency of the supramolecular gel is greater than or equal to 90%.

11. The use according to claim 9, characterized in that, The use temperature of the supramolecular hydrogel as a circularly polarized luminescent material for thermal enhancement is 10-70℃; The supramolecular gel emits blue fluorescence under 365 nm excitation light.

12. The use according to claim 11, characterized in that, The supramolecular gel emits blue fluorescence with a wavelength of 430 nm under 365 nm excitation light.

13. The use according to claim 10, characterized in that, The use temperature of the supramolecular hydrogel as a circularly polarized luminescent material for thermal enhancement is 15-60℃; The supramolecular gel emits blue fluorescence with a wavelength of 430 nm.

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