Method for macroscopically preparing stable two-dimensional conjugated polymer through cross-coupling reaction at room temperature

Abstract

The invention relates to a method for macroscopically preparing a stable two-dimensional conjugated polymer through a cross-coupling reaction at room temperature. The preparation method comprises the following steps: respectively dissolving aryl halide, aryl stannane, a methanesulfonic acid (tri-tert-butylphosphino) (2 '-amino-1, 1'-biphenyl-2-yl) palladium (II) (namely P (t-Bu) 3Pd G3) catalyst and alkali in tetrahydrofuran, preparing a mixed solution from tetrahydrofuran solutions of the aryl halide, the aryl stannane and the alkali, then dropwise adding the tetrahydrofuran solution of the P (t-Bu) 3Pd G3 into the mixed solution, and reacting for 2-4 hours at the temperature of 50-60 DEG C to obtain a target product. Reacting at room temperature to obtain a mixture; and precipitating, washing and filtering to obtain the two-dimensional conjugated polymer. The reaction is high in universality, two-dimensional conjugated polymers with various different topologies (including hexagons, triangles, rhombuses and squares) can be synthesized, and the method can be widely applied to the fields of organic photoelectricity, chemical separation, photocatalysis and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of synthesis of two-dimensional conjugated polymers with regular structure and high stability, and in particular to a method for synthesizing two-dimensional conjugated polymers with high stability in large quantities through a cross-coupling polymerization reaction catalyzed by a transition metal. Background Art

[0002] In recent years, polymers with two-dimensional periodicity, such as two-dimensional conjugated polymers, have attracted extensive attention due to their unique optical, electronic and magnetic properties. However, the large-scale and convenient synthesis of two-dimensional conjugated polymers in homogeneous solutions remains a challenge. For example, most two-dimensional conjugated polymers are synthesized under solvothermal conditions via reversible bond formation, similar to the crystallization process. Reversible bonds in two-dimensional conjugated polymers, such as imines, boroxanes and boronates, are also easily hydrolyzed, so they need to be converted into more stable bonds. Since irreversible bonds easily produce a large amount of chemically stable products, it is ideal to synthesize two-dimensional conjugated polymers via homogeneous irreversible polymerization. Recently, some irreversible carbon-carbon cross-coupling reactions have been used to grow two-dimensional conjugated polymer films at liquid-liquid and liquid-solid interfaces. However, large-scale synthesis is difficult to achieve because amorphous three-dimensional structures usually expand faster than two-dimensional structures.

[0003] In order to maintain in-plane bonding in large-scale synthesis, the high entropy cost must be fundamentally overcome by sp 2 -C-sp 2 The precise synthesis of -C bonds can eliminate the need for in situ structural self-healing processes, and the π-π aggregates can adsorb monomers and serve as self-templates for the growth of 2D conjugated polymers. Summary of the invention

[0004] In view of the above problems, the present invention provides a method for preparing a two-dimensional conjugated polymer, wherein an aryl halide with different symmetry (C2, C3, C4 or C6) and an aryl stannane are used to prepare a two-dimensional conjugated polymer under the conditions of a catalyst, a base and a solvent, and the general structural formula thereof is:

[0005]

[0006] Wherein, N represents a node monomer having a certain symmetry, and L represents a linker monomer having a certain symmetry;

[0007] Wherein, N and L are each an aryl halide or an arylstannane.

[0008] Moreover, the catalyst is P(t-Bu)3Pd G3, and the structural formula of P(t-Bu)3Pd G3 is:

[0009]

[0010] Moreover, the base is any one of potassium trimethylsilanol, tert-butyl lithium, sodium tert-butoxide, sodium hydroxide, potassium hydroxide, potassium phosphate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium acetate, and potassium carbonate, or a combination thereof.

[0011] Moreover, the solvent is any one of tetrahydrofuran, dimethyl sulfoxide, N,N-dimethylformamide, 1,4-dioxane, dichloromethane, chloroform, methanol, ethanol, toluene, acetone, and n-hexane, or a combination thereof.

[0012] Moreover, the aryl halide is any one of the following compounds:

[0013]

[0014]

[0015]

[0016] wherein X is a fluorine atom, a chlorine atom, a bromine atom or an iodine atom;

[0017] Where R is independently hydrogen or C1-C 30 alkyl, including straight chain alkyl groups having a total of 6 to 16 carbon atoms, including n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, and n-hexadecyl; and branched chain alkyl groups having a total of 8 to 30 carbon atoms, including 2-ethylhexyl, 2-ethyloctyl, 2-butylhexyl, 2-hexyloctyl, 4-hexyldecyl, 3-hexylundecyl, 2-octyldecyl, 2-octyldodecyl, 3-octyltridecyl, 2-decyldodecyl, 2-decyltetradecyl, 3-decylpentadecyl, 2-dodecylhexadecyl, 4-octyltetradecyl, 4-decylhexadecyl, 4-hexyldecyl, 4-octyldodecyl, 4-decyltetradecyl, 4-dodecylhexadecyl;

[0018] Wherein, M is a tin atom, a copper atom, a nickel atom or a zinc atom.

[0019] Moreover, the aryl stannane is any one of the following compounds:

[0020]

[0021] wherein X is a fluorine atom, a chlorine atom, a bromine atom or an iodine atom;

[0022] Wherein, R, R1, and R2 are each independently hydrogen or C1-C 30The alkyl group includes straight-chain alkyl groups having a total of 6 to 16 carbon atoms, including n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, and n-hexadecyl groups; and branched-chain alkyl groups having a total of 8 to 30 carbon atoms, including 2-ethylhexyl, 2-ethyloctyl, 2-butylhexyl, 2-hexyloctyl, 4-hexyldecyl, 3-hexylundecyl, 2-octyldecyl, 2-octyldodecyl, 3-octyltridecyl, 2-decyldodecyl, 2-decyltetradecyl, 3-decylpentadecyl, 2-dodecylhexadecyl, 4-octyltetradecyl, 4-decylhexadecyl, 4-hexyldecyl, 4-octyldodecyl, 4-decyltetradecyl, and 4-dodecylhexadecyl groups.

[0023] Moreover, the two-dimensional conjugated polymer (powder form) described in the present invention is based on the catalytic action of aryl halide and aryl stannane under P(t-Bu)3Pd G3, and the specific synthesis method is:

[0024] (1) Using inert gas protection, aryl halide, aryl stannane, base and P(t-Bu)3Pd G3 are dissolved in tetrahydrofuran solution respectively to obtain four different solutions;

[0025] (2) mixing a tetrahydrofuran solution of an aryl halide, an aryl stannane and a base to obtain a mixed solution;

[0026] (3) adding a tetrahydrofuran solution of P(t-Bu)3Pd G3 dropwise into the above mixed solution to obtain a mixture;

[0027] (4) adding methanol and collecting the resulting precipitate by filtration;

[0028] (5) washing with methanol, saturated potassium fluoride solution and hydrogen chloride (1.0 M aqueous solution) in sequence;

[0029] (6) the crude product was further purified by Soxhlet extraction with acetone, hexane, dichloromethane and chloroform in sequence;

[0030] (7) Dispersing the solids in dimethylformamide and subjecting to ultrasonic treatment for 30 minutes;

[0031] (8) The product was filtered, washed with acetone and dried under vacuum for 24 h to obtain a purified two-dimensional conjugated polymer.

[0032] Moreover, the two-dimensional conjugated polymer (self-supporting film form) described in the present invention is based on the catalytic action of aryl halide and aryl stannane under P(t-Bu)3Pd G3, and the specific synthesis method is:

[0033] (1) Using inert gas protection, aryl halide, aryl stannane, base and P(t-Bu)3Pd G3 are dissolved in tetrahydrofuran solution respectively to obtain four different solutions;

[0034] (2) mixing a tetrahydrofuran solution of an aryl halide, an aryl stannane and a base to obtain a mixed solution;

[0035] (3) adding a tetrahydrofuran solution of P(t-Bu)3Pd G3 dropwise into the above mixed solution;

[0036] (4) After two minutes, a flat substrate was placed in the reaction system and taken out after standing for 3 minutes;

[0037] (5) removing excess liquid from the surface using a scraper;

[0038] (6) Placing the substrate covered with the two-dimensional conjugated polymer in methanol can obtain a self-supporting film of the two-dimensional conjugated polymer.

[0039] Moreover, the aryl halide and aryl stannane monomers with the same or different symmetries can realize cross-coupling reaction at room temperature.

[0040] Homosymmetrical aryl halides and aryl stannane monomers can be cross-coupled at room temperature.

[0041] A two-dimensional conjugated polymer, characterized in that: the structure is as follows:

[0042]

[0043]

[0044] The advantages and positive effects of the present invention are:

[0045] (1) The present invention adopts a rapid and irreversible homogeneous polymerization method to prepare highly stable two-dimensional conjugated polymer powders and self-supporting films in just a few minutes.

[0046] (2) The two-dimensional conjugated polymer obtained in the present invention has a clear layered structure and stability under extreme conditions.

[0047] (3) The reaction of the present invention can prepare two-dimensional conjugated polymers in large quantities (gram levels) at room temperature.

[0048] (4) The present invention demonstrates the universality of two-dimensional conjugated polymers with six different topological structures (including hexagon, triangle, rhombus and square). DETAILED DESCRIPTION

[0049] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0050] Example 1

[0051] A method for preparing a two-dimensional conjugated polymer, comprising the following steps:

[0052]

[0053] Under nitrogen protection, 1,3,5-tri(4-bromophenyl)benzene (1629.29 mg, 3.00 mmol), 2,5-bis(trimethyltinyl)[3,2-b]thiophene (2096.24 mg, 4.50 mmol), P(t-Bu)3Pd G3 (171.62 mg, 0.30 mol) and potassium trimethylsiliconate (384.87 mg, 3.00 mmol) were dissolved in anhydrous tetrahydrofuran (15 mL), respectively. Then, the solutions of 1,3,5-tri(4-bromophenyl)benzene, 2,5-bis(trimethyltinyl)[3,2-b]thiophene and potassium trimethylsiliconate were mixed to prepare a mixed solution (about 45 mL). P(t-Bu)3Pd G3 solution (15 mL) was added dropwise to the mixed solution at room temperature. After 5 minutes, the reaction mixture was poured into methanol. Next, the resulting precipitate was collected by filtration and washed with methanol, saturated potassium fluoride aqueous solution and hydrogen chloride (1.0M aqueous solution) in sequence. Then, the crude product was further purified by Soxhlet extraction with acetone, n-hexane, dichloromethane and chloroform in sequence. In addition, the solids were dispersed in dimethylformamide and subjected to ultrasonic treatment for 30 minutes. Finally, the product was filtered, washed with acetone and dried under vacuum for 24 hours to obtain a purified yellow two-dimensional conjugated polymer (2.10 g, yield 71%).

[0054] Example 2

[0055] A method for preparing a two-dimensional conjugated polymer, comprising the following steps:

[0056]

[0057] Under nitrogen protection, 1,3,5-tribromobenzene (31.48 mg, 0.10 mmol), 2,5-bis(trimethyltinyl)[3,2-b]thiophene (69.87 mg, 0.15 mmol), P(t-Bu)3Pd G3 (5.72 mg, 0.010 mol) and potassium trimethylsiliconate (12.83 mg, 0.10 mmol) were dissolved in anhydrous tetrahydrofuran (0.5 mL), respectively. Then, the solutions of 1,3,5-tribromobenzene, 2,5-bis(trimethyltinyl)[3,2-b]thiophene and potassium trimethylsiliconate were mixed to prepare a mixed solution (about 1.5 mL). P(t-Bu)3Pd G3 solution (0.5 mL) was added dropwise to the mixed solution at room temperature. After 5 minutes, the reaction mixture was poured into methanol. Next, the resulting precipitate was collected by filtration and washed with methanol, saturated potassium fluoride aqueous solution and hydrogen chloride (1.0M aqueous solution) in sequence. Then, the crude product was further purified by Soxhlet extraction with acetone, n-hexane, dichloromethane and chloroform in sequence. In addition, the solids were dispersed in dimethylformamide and subjected to ultrasonic treatment for 30 minutes. Finally, the product was filtered, washed with acetone and dried under vacuum for 24 hours to obtain a purified yellow two-dimensional conjugated polymer (36.83 mg, yield 90%).

[0058] Example 3

[0059] A method for preparing a two-dimensional conjugated polymer, comprising the following steps:

[0060]

[0061] Under nitrogen protection, 1,3,5-tribromobenzene (31.48 mg, 0.10 mmol), 2,6-bis(trimethyltin)[1,2-b:4,5-b']dithiophene (77.38 mg, 0.15 mmol), P(t-Bu)3Pd G3 (5.72 mg, 0.010 mol) and potassium trimethylsiliconate (12.83 mg, 0.10 mmol) were dissolved in anhydrous tetrahydrofuran (0.5 mL), respectively. Then, the solutions of 1,3,5-tribromobenzene, 2,6-bis(trimethyltin)[1,2-b:4,5-b']dithiophene and potassium trimethylsiliconate were mixed to prepare a mixed solution (about 1.5 mL). P(t-Bu)3Pd G3 solution (0.5 mL) was added dropwise to the mixed solution at room temperature. After 5 minutes, the reaction mixture was poured into methanol. Next, the resulting precipitate was collected by filtration and washed with methanol, saturated potassium fluoride aqueous solution and hydrogen chloride (1.0M aqueous solution) in sequence. Then, the crude product was further purified by Soxhlet extraction with acetone, n-hexane, dichloromethane and chloroform in sequence. In addition, the solids were dispersed in dimethylformamide and subjected to ultrasonic treatment for 30 minutes. Finally, the product was filtered, washed with acetone and dried under vacuum for 24 hours to obtain a purified yellow two-dimensional conjugated polymer (17.22 mg, 48% yield).

[0062] Example 4

[0063] A method for preparing a two-dimensional conjugated polymer, comprising the following steps:

[0064]

[0065] Under nitrogen protection, 1,2,3,4,5,6-hexa(4-bromophenyl)benzene (100.81 mg, 0.10 mmol), 2,5-bis(trimethyltinyl)[3,2-b]thiophene (139.74 mg, 0.30 mmol), P(t-Bu)3Pd G3 (5.72 mg, 0.010 mol) and potassium trimethylsiliconate (12.83 mg, 0.10 mmol) were dissolved in anhydrous tetrahydrofuran (0.5 mL), respectively. Then, the solutions of 1,2,3,4,5,6-hexa(4-bromophenyl)benzene, 2,5-bis(trimethyltinyl)[3,2-b]thiophene and potassium trimethylsiliconate were mixed to prepare a mixed solution (about 1.5 mL). P(t-Bu)3Pd G3 solution (0.5 mL) was added dropwise to the mixed solution at room temperature. After 5 minutes, the reaction mixture was poured into methanol. Next, the resulting precipitate was collected by filtration and washed with methanol, saturated potassium fluoride aqueous solution and hydrogen chloride (1.0M aqueous solution) in sequence. Then, the crude product was further purified by Soxhlet extraction with acetone, n-hexane, dichloromethane and chloroform in sequence. In addition, the solids were dispersed in dimethylformamide and subjected to ultrasonic treatment for 30 minutes. Finally, the product was filtered, washed with acetone and dried under vacuum for 24 hours to obtain a purified black two-dimensional conjugated polymer (52.10 mg, yield 55%).

[0066] Example 5

[0067] A method for preparing a two-dimensional conjugated polymer, comprising the following steps:

[0068]

[0069] Under nitrogen protection, 1,1,2,2-tetra(4-bromophenyl)ethylene (64.80 mg, 0.10 mmol), 2,5-bis(trimethyltinyl)[3,2-b]thiophene (97.17 mg, 0.20 mmol), P(t-Bu)3Pd G3 (5.72 mg, 0.010 mol) and potassium trimethylsiliconate (12.83 mg, 0.10 mmol) were dissolved in anhydrous tetrahydrofuran (0.5 mL), respectively. Then, the solutions of 1,1,2,2-tetra(4-bromophenyl)ethylene, 2,5-bis(trimethyltinyl)[3,2-b]thiophene and potassium trimethylsiliconate were mixed to prepare a mixed solution (about 1.5 mL). P(t-Bu)3Pd G3 solution (0.5 mL) was added dropwise to the mixed solution at room temperature. After 5 minutes, the reaction mixture was poured into methanol. Next, the resulting precipitate was collected by filtration and washed with methanol, saturated potassium fluoride aqueous solution and hydrogen chloride (1.0M aqueous solution) in sequence. Then, the crude product was further purified by Soxhlet extraction with acetone, n-hexane, dichloromethane and chloroform in sequence. In addition, the solids were dispersed in dimethylformamide and subjected to ultrasonic treatment for 30 minutes. Finally, the product was filtered, washed with acetone and dried under vacuum for 24 hours to obtain a purified orange-yellow two-dimensional conjugated polymer (75.01 mg, yield 92%).

[0070] Example 6

[0071] A method for preparing a two-dimensional conjugated polymer, comprising the following steps:

[0072]

[0073] Under nitrogen protection, 5,10,15,20-tetrakis(4-bromophenyl)porphyrin (93.03 mg, 0.10 mmol), 2,5-bis(trimethyltinyl)[3,2-b]thiophene (97.17 mg, 0.20 mmol), P(t-Bu)3Pd G3 (5.72 mg, 0.010 mol) and potassium trimethylsiliconate (12.83 mg, 0.10 mmol) were dissolved in anhydrous tetrahydrofuran (0.5 mL), respectively. Then, the solutions of 5,10,15,20-tetrakis(4-bromophenyl)porphyrin, 2,5-bis(trimethyltinyl)[3,2-b]thiophene and potassium trimethylsiliconate were mixed to prepare a mixed solution (about 1.5 mL). P(t-Bu)3Pd G3 solution (0.5 mL) was added dropwise to the mixed solution at room temperature. After 5 minutes, the reaction mixture was poured into methanol. Next, the resulting precipitate was collected by filtration and washed with methanol, saturated potassium fluoride aqueous solution and hydrogen chloride (1.0M aqueous solution) in sequence. Then, the crude product was further purified by Soxhlet extraction with acetone, n-hexane, dichloromethane and chloroform in sequence. In addition, the solids were dispersed in dimethylformamide and subjected to ultrasonic treatment for 30 minutes. Finally, the product was filtered, washed with acetone and dried under vacuum for 24 hours to obtain a purified orange-yellow two-dimensional conjugated polymer (119.90 mg, yield 95%).

[0074] Example 7

[0075] A method for preparing a two-dimensional conjugated polymer, comprising the following steps:

[0076]

[0077] Under nitrogen protection, 1,3,5-tri(4-bromophenyl)benzene (54.31 mg, 0.10 mmol), 2,5-bis(trimethyltinyl)[3,2-b]thiophene (69.87 mg, 0.15 mmol), P(t-Bu)3Pd G3 (5.72 mg, 0.01 mmol) and potassium trimethylsiliconate (12.83 mg, 0.10 mmol) were dissolved in anhydrous tetrahydrofuran (0.5 mL), respectively. Then, the solutions of 1,3,5-tri(4-bromophenyl)benzene, 2,5-bis(trimethyltinyl)[3,2-b]thiophene and potassium trimethylsiliconate were mixed to prepare a mixed solution (about 1.5 mL). P(t-Bu)3Pd G3 solution (0.5 mL) was added dropwise to the mixed solution at room temperature. After 5 minutes, the reaction mixture was poured into methanol. After 2 minutes, a flat substrate was immersed in the reaction mixture and kept still for 3 minutes. The flat substrate was then taken out of the solution and subjected to doctor blade coating, and the glass plate was immersed in methanol to peel off the self-supporting two-dimensional conjugated polymer film.

[0078] The above embodiments are only specific embodiments listed to fully illustrate the present invention. The protection scope of the present invention is subject to the content of the claims and is not limited to the above specific implementation methods. All contents disclosed in the specification, including the abstract, and all disclosed methods and steps, can be combined arbitrarily, unless these features and / or steps are mutually exclusive combinations. Each technical feature disclosed in the specification, including the abstract, can be replaced by a technical feature that achieves the same, equivalent or similar purpose, unless otherwise specified. Therefore, unless otherwise specified, each technical feature disclosed in the present invention is only an example of an equivalent or similar technical feature in a general series. Equivalent substitutions or conversions made by those skilled in the art on the basis of the present invention without departing from the essence of the present invention are also within the protection scope of the present invention. And such modifications are also within the protection scope of the present invention. Each reference cited in this application is cited in its entirety.

[0079] Although the embodiments of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments.

Claims

1. A method for preparing a two-dimensional conjugated polymer, characterized in that: Aryl halides with different symmetries C2, C3, C4 or C6 and aryl stannane N and L are used to prepare two-dimensional conjugated polymers under the conditions of catalyst, base and solvent. The general reaction formula is: Wherein, N represents a node monomer having a certain symmetry, and L represents a linker monomer having a certain symmetry; wherein N and L are each an aryl halide or an arylstannane.

2. The method for preparing a two-dimensional conjugated polymer according to claim 1, characterized in that: The catalyst is P(t-Bu)3Pd G3, and the structural formula of P(t-Bu)3Pd G3 is:

3. The method for preparing a two-dimensional conjugated polymer according to claim 1, characterized in that: The base is any one of potassium trimethylsilanol, tert-butyl lithium, sodium tert-butoxide, sodium hydroxide, potassium hydroxide, potassium phosphate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium acetate, and potassium carbonate, or a combination thereof.

4. The method for preparing a two-dimensional conjugated polymer according to claim 1, characterized in that: The solvent used in the reaction is any one of tetrahydrofuran, dimethyl sulfoxide, N,N-dimethylformamide, 1,4-dioxane, dichloromethane, chloroform, methanol, ethanol, toluene, acetone, and n-hexane, or a combination thereof.

5. The method for preparing a two-dimensional conjugated polymer according to claim 1, characterized in that: The aryl halide is any one of the following compounds: wherein X is a fluorine atom, a chlorine atom, a bromine atom or an iodine atom; Where R is independently hydrogen or C1-C 30 alkyl, including straight chain alkyl groups having a total of 6 to 16 carbon atoms, including n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, and n-hexadecyl; and branched chain alkyl groups having a total of 8 to 30 carbon atoms, including 2-ethylhexyl, 2-ethyloctyl, 2-butylhexyl, 2-hexyloctyl, 4-hexyldecyl, 3-hexylundecyl, 2-octyldecyl, 2-octyldodecyl, 3-octyltridecyl, 2-decyldodecyl, 2-decyltetradecyl, 3-decylpentadecyl, 2-dodecylhexadecyl, 4-octyltetradecyl, 4-decylhexadecyl, 4-hexyldecyl, 4-octyldodecyl, 4-decyltetradecyl, 4-dodecylhexadecyl; Wherein, M is a tin atom, a copper atom, a nickel atom or a zinc atom.

6. The method for preparing a two-dimensional conjugated polymer according to claim 1, characterized in that: The aryl stannane is any of the following compounds: Wherein, R, R1, and R2 are each independently hydrogen or C1-C 30 The alkyl group includes straight-chain alkyl groups having a total of 6 to 16 carbon atoms, including n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, and n-hexadecyl groups; and branched-chain alkyl groups having a total of 8 to 30 carbon atoms, including 2-ethylhexyl, 2-ethyloctyl, 2-butylhexyl, 2-hexyloctyl, 4-hexyldecyl, 3-hexylundecyl, 2-octyldecyl, 2-octyldodecyl, 3-octyltridecyl, 2-decyldodecyl, 2-decyltetradecyl, 3-decylpentadecyl, 2-dodecylhexadecyl, 4-octyltetradecyl, 4-decylhexadecyl, 4-hexyldecyl, 4-octyldodecyl, 4-decyltetradecyl, and 4-dodecylhexadecyl groups.

7. The method for preparing a two-dimensional conjugated polymer according to claim 1, characterized in that: The specific steps include: (1) Using inert gas protection, aryl halide, aryl stannane, base and P(t-Bu)3Pd G3 are dissolved in tetrahydrofuran solution respectively to obtain four different solutions; (2) mixing a tetrahydrofuran solution of an aryl halide, an aryl stannane and a base to obtain a mixed solution; (3) adding a tetrahydrofuran solution containing P(t-Bu)3Pd G3 dropwise into the above mixed solution; (4) forming a mixture after the above mixing; (5) adding methanol and collecting the resulting precipitate by filtration; (6) washing with methanol, saturated potassium fluoride solution and aqueous hydrogen chloride solution in sequence to obtain a crude product; (7) The crude product is then purified by acetone, hexane, dichloromethane and chloroform in sequence to separate a solid; (8) dispersing the solid in dimethylformamide, subjecting the mixture to ultrasonic treatment for 30 minutes, and filtering; (9) The resulting product was washed with acetone and dried under vacuum for 24 h to obtain a powdered two-dimensional conjugated polymer.

8. The method for preparing a two-dimensional conjugated polymer according to claim 1, characterized in that: The specific steps include: (1) Using inert gas protection, aryl halide, aryl stannane, base and P(t-Bu)3Pd G3 are dissolved in tetrahydrofuran solution respectively to obtain four different solutions; (2) mixing a tetrahydrofuran solution of an aryl halide, an aryl stannane and a base to obtain a mixed solution; (3) adding a tetrahydrofuran solution containing P(t-Bu)3Pd G3 dropwise into the above mixed solution; (4) After two minutes, a flat substrate was placed in the reaction system and taken out after standing for 3 minutes; (5) removing excess liquid from the surface using a scraper; (6) Placing the substrate covered with the two-dimensional conjugated polymer in methanol can obtain a self-supporting film of the two-dimensional conjugated polymer.

9. A method for preparing a two-dimensional conjugated polymer according to claims 7 and 8, characterized in that: The aryl halide and aryl stannane monomers with the same or different symmetries can realize cross-coupling reaction at room temperature.

10. A two-dimensional conjugated polymer, characterized in that: The structure is as follows:

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