CN112029107A

CN112029107A - Triazine ligand-based two-dimensional metal organic framework material and preparation method and application thereof

Info

Publication number: CN112029107A
Application number: CN202010831341.9A
Authority: CN
Inventors: 孔凡; 程瑜; 邱腾
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2020-12-04
Anticipated expiration: 2040-08-18
Also published as: CN112029107B

Abstract

The invention discloses a triazine ligand-based two-dimensional metal organic framework material, and a preparation method and application thereof, wherein the metal organic framework is Zn-MOFs formed by chelating triazine organic ligand 2,4, 6-tri- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine with metal zinc ions. The novel ligand 2,4, 6-tri- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine prepared by the invention has excellent solubility in dichloromethane, and has high complexing speed with metal ions, and the novel ligand is chelated with zinc ions by an interfacial diffusion method to obtain the novel two-dimensional metal organic framework material Zn-MOFs.

Description

Triazine ligand-based two-dimensional metal organic framework material and preparation method and application thereof

Technical Field

The invention relates to the field of metal organic framework materials, in particular to a two-dimensional metal organic framework material based on a novel triazine organic ligand, and a preparation method and application thereof.

Background

Over the last two decades, new two-dimensional materials with specific porosity and good fluorescence have been the hot course of scientific researchThe method is mainly based on graphene (or graphene oxide) and gradually popularized to other two-dimensional materials including MoS₂、WS₂Covalent organic framework materials (COFs), and the like. The two-dimensional covalent triazine framework material (2D-CTF) is a two-dimensional covalent organic framework material which is composed of C, N elements and has a triazine ring structure, has excellent structural stability and size-adjustable in-plane structural pores, is a two-dimensional material with great potential in theory, and can be prepared by cheap and easily-available chemical precursors.

However, the traditional covalent triazine framework material is harsh in preparation conditions, and is usually polymerized under high temperature conditions by using molten zinc chloride as a catalyst based on an ionothermal method, so that the synthetic product has a skeleton structure carbonization defect and residues of chloride ions and zinc ions, which cause material structure and performance defects; in addition, the covalent triazine framework material prepared based on the method is a lamellar body phase material, great challenges are still faced from the bulk phase material to the two-dimensional nanosheet layer in stripping efficiency and product quality, the application of the 2D-CTF material is limited by the factors, and the triazine polymer has general optical properties and is difficult to have good application in the optical field.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a triazine ligand based two-dimensional metal organic framework material (Zn-MOFs), which is a Zn-MOFs with regular structure, large surface area, excellent fluorescence and excellent stability.

The invention also provides a preparation method of the triazine ligand based two-dimensional metal organic framework material, and the preparation method is mainly used for preparing and synthesizing MOFs by adopting an interfacial diffusion method.

The third purpose of the invention is to provide the application of the triazine ligand based two-dimensional metal-organic framework material.

The technical scheme is as follows: in order to achieve the above purpose, the triazine ligand based two-dimensional metal-organic framework material of the present invention is a Zn-MOFs formed by chelating a triazine ligand 2,4, 6-tris- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine with a metal zinc ion.

Wherein, the structural formula of the organic ligand is as follows:

preferably, the novel triazine organic ligand mainly comprises: 4-cyanobenzaldehyde, 1,3, 5-triazine-2, 4, 6-tribenzaldehyde and 2-methyl-8-hydroxyquinoline were used in amounts of (2.64g, 20mmol), (1g, 2.5mmol) and (1.3g, 8mmol), respectively, and chloroform, acetic anhydride and DMF used in amounts of (25 to 40ml), (25ml to 40ml) and (20 to 30ml), respectively.

The preparation method of the triazine ligand based two-dimensional metal organic framework material comprises the following steps:

(1) synthesis of 1,3, 5-triazine-2, 4, 6-triphenylformaldehyde

Weighing 4-cyanobenzaldehyde, pouring the 4-cyanobenzaldehyde into a three-neck flask, adding trichloromethane to dissolve the trichloromethane, gradually dropwise adding trifluoromethanesulfonic acid as a catalyst under an ice bath condition, reacting at room temperature after dropwise adding, directly pouring the mixture into ice water to stir after the reaction is finished, adjusting the pH value to be neutral, filtering, washing and drying to obtain a yellowish white solid, and purifying by adopting column chromatography to obtain 1,3, 5-triazine-2, 4, 6-tribenzaldehyde;

(2) weighing 1,3, 5-triazine-2, 4, 6-triphenylformaldehyde and 2-methyl-8-hydroxyquinoline, adding acetic anhydride as a solvent, heating under the protection of inert gas, stirring for reaction, naturally cooling to room temperature after the reaction is stopped, pouring the reactant into ice water, stirring overnight, and performing suction filtration to obtain a yellowish-brown solid;

(3) dissolving the yellowish-brown solid obtained in the step (2) in DMF, heating, adding HCl solution with the mass fraction of 36-38%, heating for reaction, naturally cooling, standing overnight, and performing suction filtration to obtain a golden-brown solid;

(4) dissolving the golden yellow solid in DMF, adding triethylamine for neutralization, stirring for reaction, pouring the reactant into ice water, stirring overnight, performing suction filtration to obtain brown powder solid, and purifying by adopting column chromatography to obtain bright yellow solid, namely the triazine organic ligand 2,4, 6-tri- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine;

(5) weighing 2,4, 6-tri- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine ligand, dissolving in dichloromethane, slowly dropwise adding deionized water above a dichloromethane solution to serve as a buffer layer, weighing zinc chloride, dissolving in deionized water, slowly dropwise adding a zinc chloride aqueous solution above the buffer layer, sealing, placing in a dark box, chelating the ligand with metal ions, allowing orange solid to appear at an interface, collecting a solid product, and washing to obtain the Zn-MOFs.

Wherein the molar ratio of the trichloromethane to the 4-cyanobenzaldehyde in the step (1) is 15-20: 1.

wherein the molar ratio of the 1,3, 5-triazine-2, 4, 6-tribenzaldehyde to the 2-methyl-8-hydroxyquinoline in the step (2) is 1: 3-4; the molar ratio of the 1,3, 5-triazine-2, 4, 6-tribenzaldehyde to the acetic anhydride is 1: 100-110.

Wherein, the eluent used when the 1,3, 5-triazine-2, 4, 6-triphenylformaldehyde is purified by column chromatography is dichloromethane: methanol 25: 1; the eluent used for the purification of the ligand 2,4, 6-tri- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine by column chromatography is petroleum ether: ethyl acetate 3: 1.

Wherein, the concentration of the ligand in the step (5) is less than 2mg/ml, and the concentration of the zinc ions is the same as that of the ligand.

Wherein the inert gas is nitrogen or argon.

Preferably, the chelating time of the ligand and the metal ions in the step (5) is 20-24h, and the temperature is room temperature; the optimal chelation time was 24 h. Namely, in the preparation method of Zn-MOFs of the invention, the reaction temperature of the interfacial diffusion method is room temperature, and the optimal collection time of the interfacial diffusion is 24 hours.

Preferably, the solvent dichloromethane and water used in the step (5) are used in a volume ratio of 1: 1.

The invention relates to application of a triazine ligand-based two-dimensional metal organic framework material in the field of photoelectron.

The invention selects a triazine ring-containing building unit as a precursor, combines the excellent optical performance of quinoline, designs and synthesizes a triazine and quinoline organic ligand-based two-dimensional metal organic framework material, and researches the application of the material in the aspect of optics.

The invention completely synthesizes a triazine organic ligand, 4-cyanobenzaldehyde is dissolved in chloroform and poured into a flask, trifluoromethanesulfonic acid is added for catalysis under the ice bath condition, 1,3, 5-triazine-2, 4, 6-triphenylformaldehyde is obtained by stirring and synthesizing at normal temperature, the obtained product, 2-methyl-8-hydroxyquinoline and acetic anhydride are added into the flask, heating and stirring are carried out under the protection of inert gas to obtain an intermediate, the intermediate is dissolved in DMF, HCl is added, triethylamine is added for neutralization after reaction for a period of time, finally the mixture is introduced into ice water to obtain a novel ligand 2,4, 6-tri- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine crude product, after purification, the novel ligand is chelated with zinc ions by an interface diffusion method, obtaining the novel zinc-based two-dimensional metal organic framework material

The 8-hydroxyquinoline metal complex is introduced into a macromolecular structure to form a high-molecular 8-hydroxyquinoline metal complex, so that the defect of metal ion aggregation caused by simple doping of metal ions and polymers is overcome, and the advantages of excellent optical and electrical properties of the small-molecular metal complex, good thermal stability of the polymers, easiness in processing and forming and the like are retained. Based on the theory, the invention designs and synthesizes a new ligand 2,4, 6-tri- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl group containing olefinic bond by reacting 2-methyl-8-hydroxyquinoline with 1,3, 5-triazine-2, 4, 6-tribenzaldehyde]The ligand has stronger luminous performance, so that the ligand and zinc ions are complexed to form a macromolecular metal ion complex, and the functional material with good thermal stability and fluorescence performance is obtained. The complexation method adopted in the experiment is an interfacial diffusion method, and the interfacial diffusion method is rarely used for synthesizing metal MOFs at present, because the method has high requirement on the solubility of reactants and consumes long time. But because the solubility of the new ligand synthesized by the invention in dichloromethane is excellent, 1g of ligand can be completely dissolved in 1ml of dichloromethane and the complexing speed with metal ions is very high, and the generation of solid can be obviously seen at the interface after the reaction for 1h at room temperature, the adoption of the interface diffusion method not only is simple, convenient and rapid, but also the synthesized two-dimensional Zn-MOFs material has regular and uniform appearance,the surface is smooth, the edge length of the sheet complex can reach 53um, and the surface area can reach 2813um²The excellent fluorescence, stability and large surface area provide superior conditions for manufacturing optical devices with good functions in the future, and lay a good foundation for subsequent application in the field of photoelectrons.

The invention overcomes the defect of poor optical performance of the traditional triazine two-dimensional organic framework material, and introduces 8-hydroxyquinoline to ensure that the optical performance of the material becomes excellent. Because the traditional ionic thermal method needs high temperature of 400 ℃, is not safe and has long reaction time, and can cause the product structure to be three-dimensional block and troublesome stripping, the invention uses the interface diffusion method to synthesize the two-dimensional material, only needs room temperature reaction and has short time and high yield, and the prepared two-dimensional material has large surface area and can be applied to mass production industrialization.

The invention designs and synthesizes the following routes:

step (1) synthesizing 1,3, 5-triazine-2, 4, 6-triphenylformaldehyde

Step (2) (3) (4) Synthesis of 2,4, 6-tris- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine.

Has the advantages that: compared with the prior art, the invention has the following advantages:

the preparation method has the advantages of simple and easy operation, wide raw material source, mature technology, no need of a large amount of capital and easy industrialization. The triazine organic framework material prepared by the invention has excellent fluorescence and stability, and the two-dimensional Zn-MOFs material synthesized by the interfacial diffusion method has regular and uniform appearance and smooth surface, the edge length of the sheet complex can reach 53um, and the surface area can reach 2813um²Provides excellent conditions for manufacturing optical devices with good functions in the future and provides excellent conditions for subsequent manufacturingThe application of the photoelectron field lays a good foundation. The interface diffusion method is expected to be applied to the MOFs.

The method has the advantages of simple and easy operation, wide raw material sources, low production cost and mature technology, and the Zn-MOFs synthesized by the interface diffusion method has the advantages of regular structure, large surface area, mild conditions and simple operation, and opens up a new method for synthesizing a large amount of two-dimensional metal organic framework materials in the future. The Zn-MOFs synthesized in this time can emit stronger fluorescence within the range of 550-750nm under the action of ultraviolet light, the fluorescence intensity of the Zn-MOFs is influenced by the structure of the Zn-MOFs, the larger the conjugation degree of the system is, the stronger the fluorescence is, the thickness of the MOFs can be controlled by controlling the concentration of the ligand, and further the fluorescence intensity of the MOFs can be controlled, so that the Zn-MOFs can be used for preparing materials in the photoelectronic field with excellent performance. In addition, the Zn-MOFs has a wide ultraviolet absorption wavelength range, can be used as a low-color efficient ultraviolet absorbent, and has a good application prospect in the field of polymer material ultraviolet absorbents.

Drawings

FIG. 1 is a nuclear magnetic hydrogen spectrum of the 2,4, 6-tris- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine ligand obtained in the present invention;

FIG. 2 is a nuclear magnetic mass spectrum of the 2,4, 6-tris- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine ligand obtained in the present invention;

FIG. 3 is an infrared spectrum of Zn-MOFs formed by complexing 2,4, 6-tris- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine ligand with zinc ions obtained in the present invention;

FIG. 4 is a scanning electron microscope image of the obtained Zn-MOFs in full view and at a fault;

FIG. 5 is a transmission electron micrograph of the resulting Zn-MOF after crushing;

FIG. 6 is a lattice diagram of electron diffraction of the resulting Zn-MOF after crushing;

FIG. 7 is a graph showing fluorescence emission spectra of the obtained ligands and Zn-MOFs;

FIG. 8 is a graph showing the ultraviolet absorption spectra of the obtained ligands and Zn-MOFs.

Detailed Description

The invention will be further described with reference to specific embodiments and the accompanying drawings.

The experimental methods described in the examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.

Example 1

Synthesis of 1,3, 5-triazine-2, 4, 6-tribenzaldehyde: weighing 4-cyanobenzaldehyde (2.64g, 20mmol), pouring into a 100mL three-neck flask, adding 25mL trichloromethane (310mmol) to dissolve the trichloromethane, gradually dropwise adding 6mL trifluoromethanesulfonic acid under the condition of 0 ℃ and nitrogen protection, and after dropwise adding for 30 minutes, stirring at room temperature for reaction for 24 hours. After 24h, the reaction was poured into 250mL of ice water and stirred for 12h, diluted ammonia water was added to adjust the pH to neutral, and the solid was filtered, washed and dried to obtain a yellow-white solid. Purifying the product by column chromatography, wherein an eluent is dichloromethane: methanol 25:1 (volume ratio) to give a pure white powder solid, i.e., 1,3, 5-triazine-2, 4, 6-triphenylformaldehyde, in 63% yield.

1,3, 5-triazine-2, 4, 6-tribenzaldehyde (1g, 2.5mmol) and 2-methyl-8-hydroxyquinoline (1.3g, 8mmol) were weighed out and poured into a three-necked flask, 25mL of acetic anhydride (264mmol) was added, the temperature was raised to 125 ℃ under nitrogen protection, and the reaction was stirred for 40 hours. After the reaction was stopped, the reaction mixture was naturally cooled to room temperature, poured into 100mL of ice water, stirred overnight, and filtered with suction to give a yellowish brown solid.

And (3) completely dissolving the obtained yellowish-brown solid in 35mLDMF, heating to 120 ℃, adding 35mL of HCl solution with the mass fraction of 36% -38%, heating to 125 ℃, reacting for 2h, naturally cooling, standing overnight, and performing suction filtration to obtain a golden yellow solid.

Dissolving the golden yellow solid in 20mL of mixed solution of sodium hydroxide and sodium hydroxide, adding 15mL of triethylamine, stirring at 60 ℃ for 1h, pouring the reactant into 100mL of ice water, stirring overnight, performing suction filtration to obtain brown powdery solid, and purifying by adopting column chromatography, wherein an eluent is petroleum ether: ethyl acetate 3:1 (vol.%) gave 2,4, 6-tris- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine as a pale yellow flocculent solid in 57% yield.

2,4, 6-tris- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine has the following structural formula:

1H NMR(DMSO)σ:9.65(s,1H),8.34(d,1H,J＝6.00Hz),8.23(d,1H,J＝9.00Hz),7.91(q,4H),7.80(d,1H,J＝9.00Hz),7.67(d,1H,J＝9.00Hz),7.42(t,1H),7.38(m,1H),7.11(dd,1H).HRMS(ESI):m/z 817.475[M+H]⁺。

wherein, FIG. 1 and FIG. 2 are nuclear magnetic hydrogen spectrum and mass spectrum of 2,4, 6-tri- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine obtained in example 1, and the successful synthesis of 2,4, 6-tri- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine is illustrated by the position and area of nuclear magnetic hydrogen spectrum peak and relative molecular mass spectrum.

Example 2

Preparing a metal complex by an interfacial diffusion method: weighing 5mg of ligand finally prepared in example 1, dissolving the ligand in 5mL of dichloromethane, transferring the ligand into a 10mL strain bottle, slowly dropwise adding 2mL of deionized water above the dichloromethane solution to serve as a buffer layer, weighing 3mg of zinc chloride, dissolving the zinc chloride in 3mL of deionized water, slowly dropwise adding the zinc chloride aqueous solution above the buffer layer, sealing the buffer layer, placing the buffer layer in a dark box, and reacting for 24 hours at room temperature. Orange solid appears at the interface after 24h, and the Zn-MOFs can be obtained by collecting the product and washing the product after centrifugation for three minutes at 4000rpm, wherein the yield is 68%.

FIG. 3 is a drawing of the 2,4, 6-tris- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl group obtained in examples 1 and 2 of the present invention]Infrared spectrum of Zn-MOFs formed by complexing 1,3, 5-triazine ligand with zinc ion, 3340cm after complexing ligand with zinc ion is found by analysis^-1The peak of hydroxyl group disappears, indicating successful complexation of the ligand with metal ion.

FIG. 4 is a scanning electron microscope image of the overall appearance and fault of the Zn-MOFs obtained in example 2, and it can be seen from the left image that the complex Zn-MOFs is in a prismatic sheet structure, and has regular shape, smooth edges, obvious sheet structure and large surface area; the right picture is a cross-sectional scanning electron microscope picture of the complex, and the Zn-MOFs still have a layered structure inside.

FIG. 5 is a transmission electron micrograph of the Zn-MOFs crushed by a mortar and photographed, and further verifies the sheet structure of the complex. FIGS. 4 and 5 are illustrations showing that the Zn-MOFs of the present invention have a sheet-like structure, and are suitable for two-dimensional materials.

FIG. 6 is a lattice of an electron diffraction pattern of prepared Zn-MOFs crushed by a mortar and photographed, illustrating that the complex is a crystal.

FIG. 7 is a fluorescence emission spectrum of the ligands obtained in examples 1 and 2 and Zn-MOFs, obtained by solid state fluorescence assay. It can be seen that, under the excitation of ultraviolet light with a wavelength of 330nm, the ligand only has a peak with smaller intensity at 440nm, which indicates that the ligand can emit weaker fluorescence, while for the high molecular zinc complex, namely the Zn-MOFs of the invention, under the excitation of ultraviolet light with a maximum excitation wavelength of 380nm, a larger fluorescence emission peak occurs between 525 and 750, and the peak emits orange-red light at 600nm, which indicates that after the Zn-MOFs are formed, the fluorescence is greatly enhanced, thereby laying a good foundation for the subsequent application in the field of photoelectrons.

FIG. 8 is a graph showing the ultraviolet absorption spectra of the ligands and their zinc complexes Zn-MOFs, obtained by crushing the Zn-MOFs solid with a mortar and dispersing in dichloromethane for ultraviolet absorption test. E1 and E2 absorption bands generated by a quinoline ring in the ligand at 276-320nm, and absorption bands generated by pi-pi transition in a ligand molecule at 333-418 nm; in the ultraviolet spectrum of the complex, E1, E2 bands and bands formed by pi-pi transition still exist, but the ligand and Zn²⁺After the complex is formed, the absorption spectrum is shifted due to the increased degree of conjugation of the molecule. And the zinc complex also obviously increases an absorption peak at 432-507 nm. The Zn-MOFs has wide ultraviolet absorption wavelength range, can be used as a low-color high-efficiency ultraviolet absorbent, and has good application prospect in the field of polymer material ultraviolet absorbents. In addition, the Zn-MOFs material of the invention has mesopores and micropores, and can be used in aspects of gas adsorption separation and the like.

Example 3

Example 3 was prepared according to the same manner as in examples 1 and 2, except that the molar ratio of chloroform to 4-cyanobenzaldehyde was 15: 1; the molar ratio of the 1,3, 5-triazine-2, 4, 6-tribenzaldehyde to the 2-methyl-8-hydroxyquinoline is 1: 3; the mol ratio of the 1,3, 5-triazine-2, 4, 6-tribenzaldehyde to the acetic anhydride is 1: 100, respectively; the ligand concentration is 1.5mg/mL, the zinc ion concentration is the same as the ligand concentration, the optimal chelating time of the ligand and the metal ion is 20h, and the temperature is room temperature.

Example 4

Example 4 was prepared according to the same manner as in examples 1 and 2, except that the molar ratio of chloroform to 4-cyanobenzaldehyde was 20: 1; the molar ratio of the 1,3, 5-triazine-2, 4, 6-tribenzaldehyde to the 2-methyl-8-hydroxyquinoline is 1: 4; the mol ratio of the 1,3, 5-triazine-2, 4, 6-tribenzaldehyde to the acetic anhydride is 1: 110; the ligand concentration is 0.5mg/mL, the zinc ion concentration is the same as the ligand concentration, the optimal chelating time of the ligand and the metal ion is 22h, and the temperature is room temperature.

Claims

1. The two-dimensional metal-organic framework material based on the triazine ligand is characterized in that the metal-organic framework is Zn-MOFs formed by chelating metal zinc ions with triazine organic ligand 2,4, 6-tri- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine.

2. The triazine ligand based two-dimensional metal-organic framework material as claimed in claim 1, wherein the organic ligand has the following structural formula:

3. the preparation method of the triazine ligand based two-dimensional metal-organic framework material as claimed in claim 1, which is characterized by comprising the following steps:

(1) synthesis of 1,3, 5-triazine-2, 4, 6-triphenylformaldehyde

Weighing 4-cyanobenzaldehyde, adding trichloromethane to dissolve the 4-cyanobenzaldehyde, gradually dropwise adding trifluoromethanesulfonic acid under an ice bath condition, reacting at room temperature after dropwise adding, directly pouring the mixture into ice water after the reaction is finished, stirring, adjusting the pH, filtering, washing and drying to obtain a yellowish white solid, and purifying to obtain 1,3, 5-triazine-2, 4, 6-tribenzaldehyde;

(3) dissolving the yellowish-brown solid in DMF, heating, adding HCl solution, heating for reaction, naturally cooling, standing overnight, and performing suction filtration to obtain a golden yellow solid;

(4) dissolving the golden yellow solid in DMF, adding triethylamine, stirring for reaction, directly pouring the reactant into ice water, stirring overnight, performing suction filtration to obtain brown powder solid, and purifying to obtain bright yellow solid, namely the triazine organic ligand 2,4, 6-tri- [4- (8-hydroxy-2-vinyl-quinoline) -phenyl ] -1,3, 5-triazine;

4. The method for preparing a triazine ligand-based two-dimensional metal-organic framework material according to claim 3, wherein the molar ratio of the trichloromethane to the 4-cyanobenzaldehyde in the step (1) is preferably 15-20: 1.

5. the method for preparing a triazine ligand-based two-dimensional metal-organic framework material according to claim 3, wherein the molar ratio of the 1,3, 5-triazine-2, 4, 6-tribenzaldehyde to the 2-methyl-8-hydroxyquinoline in the step (2) is 1: 3-4; the molar ratio of the 1,3, 5-triazine-2, 4, 6-tribenzaldehyde to the acetic anhydride is 1: 100-110.

6. The method for preparing a triazine ligand-based two-dimensional metal-organic framework material according to claim 3, wherein the concentration of the ligand in the step (5) is less than 2mg/mL, and the concentration of zinc ions is the same as the concentration of the ligand.

7. The method for preparing a triazine ligand-based two-dimensional metal-organic framework material according to claim 3, wherein the ligand is chelated with the metal ions for 20-24h at room temperature.

8. Use of the triazine ligand based two-dimensional metal-organic framework material according to claim 1 in the field of optoelectronics.