CN115739189B - Preparation method of nanoparticle composite material for rapidly catalyzing suzuki reaction at room temperature - Google Patents

Preparation method of nanoparticle composite material for rapidly catalyzing suzuki reaction at room temperature Download PDF

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CN115739189B
CN115739189B CN202211403573.XA CN202211403573A CN115739189B CN 115739189 B CN115739189 B CN 115739189B CN 202211403573 A CN202211403573 A CN 202211403573A CN 115739189 B CN115739189 B CN 115739189B
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CN115739189A (en
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王海平
郑潮
张赐茂
林镇强
陈璐
林登政
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Wuyi University
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Abstract

The invention discloses a preparation method of a nanoparticle composite material for rapidly catalyzing suzuki reaction at room temperature, relates to the technical field of suzuki reaction catalysts, and is based on a clamp-aza crown ether ligand L 1 And zirconium-based metal-organic framework material PCN-700 Metal-organic framework supported palladium nanoparticle composite Pd@PCN-700-L 1 Is prepared by the following steps. The nanoparticle composite material can rapidly catalyze the Suzuki reaction at room temperature under the air condition, and has the advantages of high activity, simple reaction treatment, mild reaction condition, environment-friendly chemical compliance of a solvent and the like. The catalyst shows good cross-coupling catalytic activity on bromobenzene and phenylboronic acid under the finite field effect of a metal-organic framework material PCN-700 nanometer pore canal, and simultaneously has good cross-coupling catalytic activity on bromobenzene and phenylboronic acidThe chlorobenzene with poor reactivity also has high catalytic performance.

Description

Preparation method of nanoparticle composite material for rapidly catalyzing suzuki reaction at room temperature
Technical Field
The invention relates to the technical field of suzuki reaction catalysts, in particular to a preparation method of a nanoparticle composite material for rapidly catalyzing suzuki reaction at room temperature.
Background
The Suzuk i (Suzuki) coupling reaction is one of effective methods for constructing carbon-carbon bonds, and is widely applied to the synthesis fields of functional materials, natural products, medical intermediates and the like. However, the homogeneous catalyst cannot be recovered and the experimental post-treatment is complex, so the preparation and research of the catalyst for heterogeneously catalyzing the Suzuki reaction are focused on. The zirconium-based metal-organic framework material with stable physical and chemical properties has a pore structure with nano-scale, and is a good carrier with catalytic activity nano particles; meanwhile, the nano-domain effect of the pore canal can improve the catalytic activity of the pore canal.
By utilizing a zirconium-based metal-organic framework material PCN-700 in which there are free sites available for insertion of building blocks of two different lengths, biphenyl dicarboxylic acid and terphenyl dicarboxylic acid, the synthetic strategy can be modified later to functionalize PCN-700. With this strategy, it is possible to introduce a clamp ligand with crown ether in zirconium-based metal-organic framework material PCN-700 and further prepare the corresponding nano palladium particles in its nanochannels. To obtain the heterogeneous catalyst for rapidly catalyzing the suzuki reaction at room temperature.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of a nanoparticle composite material for rapidly catalyzing Suzuki reaction at room temperature, which aims to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: preparation method of nanoparticle composite material for rapidly catalyzing suzuki reaction at room temperatureMethod based on clamp-aza crown ether ligands L 1 And zirconium-based metal-organic framework material PCN-700 Metal-organic framework supported palladium nanoparticle composite Pd@PCN-700-L 1 Is prepared by the following steps.
Wherein the clamp-aza crown ether ligand L 1 The preparation of the composition comprises the following steps:
s1, under the nitrogen environment, adding (3, 6-dibromopyridine-2-yl) methanol, 4-ethoxycarbonyl phenylboronic acid, tetrakis (triphenylphosphine) palladium, sodium carbonate, dioxane and water into the mixture for reaction to obtain a product of diethyl 4,4' - (6- (hydroxymethyl pyridine-2, 5-diyl) dibenzoate;
s2, diethyl 4,4' - (6-hydroxymethylpyridine-2, 5-diyl) dibenzoate and CBr 4 And 25mL of ultra-dry tetrahydrofuran were incorporated into a 50mL flask, and PPh was added with stirring 3 Reacting for 12 hours at normal temperature to obtain a product of diethyl 4,4' - (6- (bromomethyl) pyridine-2, 5-diyl) dibenzoate;
s3, adding diethyl 4,4'- (6- (bromomethyl) pyridine-2, 5-diyl) dibenzoate, aza-18-crown-6, triethylamine and toluene solution into the mixture for reaction, heating and refluxing for 24 hours, stopping the reaction, evaporating and concentrating to obtain dark red solid, purifying by silica gel column chromatography, and finally obtaining yellow liquid product, namely diethyl crown ether structural unit-containing clamp-like ligand 4,4' - (6- (1, 4,7,10, 13-pentaoxa-16-azacyclooctadecane-16-yl) methyl) pyridine-2, 5-dibenzoate;
s4, heating the suspension of the product obtained in the step S3 in 30mL of tetrahydrofuran to 65 ℃ for reacting for half an hour, adding 30mL of sodium hydroxide solution, continuing to react for 24 hours, evaporating and spin-drying the tetrahydrofuran, adding dilute hydrochloric acid, acidifying until a large amount of precipitate is formed, and filtering to obtain white solid carboxylated ligand L 1
Wherein, the preparation of the zirconium-based metal-organic framework material PCN-700 comprises the following steps:
s5, 200mg of ZrC l 4 100mg of 2,2' -dimethyl-4, 4' -biphenyldicarboxylic acid, 1.0mL of trifluoroacetic acid and 20mL of N, N ' -dimethylformamide were filled into Pyrex vials;
s6, heating the mixture in the bottle in a baking oven at 120 ℃ for 72 hours;
s7, cooling to room temperature, and preparing a zirconium-based metal-organic framework material PCN-700;
wherein the metal-organic framework supported palladium nanoparticle composite material Pd@PCN-700-L 1 The preparation of the composition comprises the following steps:
s8, activating PCN-700 and L 1 Adding 4,4' -biphenyl dicarboxylic acid and 4mL of N, N ' -dimethylformamide into a 10mL glass bottle, carrying out ultrasonic treatment for 5 minutes, heating the mixture in an oven at 85 ℃ for 24 hours, washing the mixture by fresh N, N ' -dimethylformamide for multiple times, removing unreacted ligand in a pore canal, soaking the mixture in fresh DMF solution, and finally obtaining pale yellow crystal PCN-700-L 1
S9, 40mg of PCN-700-L 1 PdCl 4mg 2 And 5mL acetonitrile solution are filled into a 20mL glass vial, the mixture is heated for 30 hours at 50 ℃, the reaction is finished, and crystals are obtained by centrifugation;
s10, slowly adding the prepared NaBH into a small bottle filled with crystals 4 Reducing methanol solution for 20 min, removing salt and residual acetonitrile solution in pore canal with anhydrous methanol at least 3 times per day for 3 days, vacuum drying in vacuum oven at 65deg.C for 24 hr, and removing methanol to obtain black crystal Pd@PCN-700-L 1
Further optimizing the technical scheme, in the step S1, (3, 6-dibromopyridin-2-yl) methanol is 5.34g of 20mmo l, 4-ethoxycarbonyl phenylboronic acid is 9.31g of 48mmo l, tetrakis (triphenylphosphine) palladium is 80mg of 0.069mmo l, sodium carbonate is 10.18g,96mmo l, dioxane is 300mL, and water is 50mL.
Further optimizing the technical scheme, in the step S1, the reaction time is 40 hours, the reaction temperature is 105 ℃, 6.86g of product is obtained, and the yield of the product is 84.6%.
Further optimizing the technical scheme, in the step S2, the diethyl 4,4' - (6-hydroxymethylpyridine-2, 5-diyl) dibenzoate is 2.03g,5mmol, CBr 4 2.49g of 7.5mmol of product were obtained, 1.67g of product was obtainedThe yield of (2) was 71.6%.
Further optimizing the technical scheme, in the step S3, the diethyl 4,4'- (6- (bromomethyl) pyridine-2, 5-diyl) dibenzoate is 1.50g,3.21mmo l, aza-18-crown-6 is 0.93g,3.53mmo l and triethylamine is 0.4g, and the obtained clamp-like ligand 4,4' - (6- (1, 4,7,10, 13-pentaoxa-16-azaoctadeca-16-yl) methyl) pyridine-2, 5-dibenzoate diethyl ester is 1.67g, and the clamp-like ligand yield is 76.6%.
Further optimizing the technical scheme, in the step S4, the product in 30mL of tetrahydrofuran is 1.1g of 1.69mmo L, the sodium hydroxide solution is 0.20g of 5.07mmo L, and the ligand L is carboxylated by a white solid 1 0.83g, yield 82.5%.
Further optimizing the technical scheme, in the step S8, PCN-700 is 20mg 0.0106mmo l,L 1 1.5mg 0.0025mmo l,4,4' -Biphthalic acid 4.0mg 0.0165mmo L, crystalline PCN-700-L 1 Is 2300.81.
Further optimizing the technical scheme, in the step S10, naBH 4 The methanol solution was 3mg of 0.08mmol, crystalline Pd@PCN-700-L 1 Pd in the catalyst was 6wt%.
Compared with the prior art, the invention provides a preparation method of a nanoparticle composite material for rapidly catalyzing Suzuki reaction at room temperature, which has the following beneficial effects:
1. the preparation method of the nanoparticle composite material for rapidly catalyzing SUZUKI reaction at room temperature has the advantages of simpler preparation method, milder reaction conditions, commercially available raw materials, low price and the like, and the clamp-aza crown ether ligand L with room temperature SUZUKI reaction is successfully introduced into the PCN-700 material by adopting a post-modification synthesis strategy 1 The functional construction unit L 1 The palladium nano particles on the surface of the metal-organic framework are well dispersed and have very uniform size, and the size of the palladium nano particles is between 20 and 25nm after the palladium nano particles are reduced by a reducing agent.
2. Preparation of nanoparticle composite material for rapidly catalyzing Suzuki reaction at room temperatureThe preparation method can rapidly catalyze the Suzuki reaction under the conditions of room temperature and air, has the advantages of high activity, simple reaction treatment, mild reaction conditions, environment-friendly chemistry of solvents and the like, and introduces the catalytic unit ligand L 1 By utilizing the finite field effect of PCN-700 nanometer pore canal of the metal-organic framework material, the catalyst not only has good cross-coupling catalytic activity on bromobenzene and phenylboronic acid, but also has high catalytic performance on chlorobenzene with poor reaction activity, namely, the catalyst can rapidly catalyze Suzuki reaction at 40 ℃ under the air condition to obtain the expected product.
Drawings
FIG. 1 shows a clamp-aza crown ether ligand L of a preparation method of a nanoparticle composite material for rapidly catalyzing Suzuki reaction at room temperature 1 A structural schematic;
FIG. 2 is a schematic illustration of a nanoparticle composite material for rapid catalysis of Suzuki reaction at room temperature in accordance with the present invention;
FIG. 3 shows a clamp-aza crown ether ligand L of a nanoparticle composite material for rapidly catalyzing Suzuki reaction at room temperature 1 Is prepared by the preparation method;
fig. 4 is a palladium nanoparticle scanning electron microscope image of a nanoparticle composite material for rapidly catalyzing suzuki reaction at room temperature.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
preparation method of nanoparticle composite material for rapidly catalyzing suzuki reaction at room temperature and based on clamp-aza crown ether ligand L 1 And zirconium-based metal-organic framework material PCN-700 Metal-organic framework supported palladium nanoparticle composite Pd@PCN-700-L 1 Is prepared from. Based on the structural characteristics of the zirconium-based metal-organic framework material PCN-700, which is provided with a free site for post-modification insertion of biphenyl dicarboxylic acid or terphthalic acid, a clamp-aza crown ether ligand L with a terphenyl dicarboxylic acid-like structure shown in figure 1 is designed and prepared 1 . The ligand palladium complex has the capability of rapidly catalyzing SUZUKI reaction at room temperature. And as shown in FIG. 2, it is introduced into PCN-700 skeleton by post-modification means, in combination with PdCl 2 After the reaction, the Pd nano-particle loaded zirconium-based metal-organic framework material is obtained by sodium borohydride reduction.
Wherein, as shown in FIG. 3, the clamp-aza crown ether ligand L 1 The preparation of the composition comprises the following steps:
s1, under the nitrogen environment, adding (3, 6-dibromopyridine-2-yl) methanol, 4-ethoxycarbonyl phenylboronic acid, tetrakis (triphenylphosphine) palladium, sodium carbonate, dioxane and water into the mixture for reaction to obtain a product of 4,4' - (6- (hydroxymethyl pyridine-2, 5-diyl) diethyl dibenzoate.
Further, in the step S1, (3, 6-dibromopyridin-2-yl) methanol was 5.34g of 20mmo l, 4-ethoxycarbonylphenylboronic acid was 9.31g of 48mmo l, tetrakis (triphenylphosphine) palladium was 80mg of 0.069mmo l, sodium carbonate was 10.18g,96mmo l, dioxane 300mL, and water 50mL.
Further, in the step S1, the reaction time was 40 hours, the reaction temperature was 105℃and 6.86g of a product was obtained in a yield of 84.6%.
S2, diethyl 4,4' - (6-hydroxymethylpyridine-2, 5-diyl) dibenzoate and CBr 4 And 25mL of ultra-dry tetrahydrofuran were incorporated into a 50mL flask, and PPh was added with stirring 3 The reaction is carried out for 12 hours at normal temperature, and the product diethyl 4,4' - (6- (bromomethyl) pyridine-2, 5-diyl) dibenzoate is obtained.
Further, in the step S2, diethyl 4,4' - (6-hydroxymethylpyridine-2, 5-diyl) dibenzoate was found to be 2.03g,5mmol, CBr 4 2.49g of 7.5mmol of product are obtained in a yield of 71.6%.
S3, adding diethyl 4,4'- (6- (bromomethyl) pyridine-2, 5-diyl) dibenzoate, aza-18-crown-6, triethylamine and toluene solution into the mixture for reaction, heating and refluxing for 24 hours, stopping the reaction, evaporating and concentrating to obtain dark red solid, and purifying by silica gel column chromatography to finally obtain yellow liquid product, namely the clamp-like ligand 4,4' - (6- (1, 4,7,10, 13-pentaoxa-16-azacyclooctadecane-16-yl) methyl) pyridine-2, 5-diethyl dibenzoate containing crown ether structural units.
In this example, in the step S3, diethyl 4,4'- (6- (bromomethyl) pyridine-2, 5-diyl) dibenzoate was 1.50g,3.21mmo l, aza-18-crown-6 was 0.93g,3.53mmo l, and triethylamine was 0.4g, and the resulting clamp-like ligand 4,4' - (6- (1, 4,7,10, 13-pentaoxa-16-azaoctadeca-16-yl) methyl) pyridine-2, 5-dibenzoate diethyl was 1.67g, and the clamp-like ligand yield was 76.6%.
S4, heating the suspension of the product obtained in the step S3 in 30mL of tetrahydrofuran to 65 ℃ for reacting for half an hour, adding 30mL of sodium hydroxide solution, continuing to react for 24 hours, evaporating and spin-drying the tetrahydrofuran, adding dilute hydrochloric acid, acidifying until a large amount of precipitate is formed, and filtering to obtain white solid carboxylated ligand L 1
In this example, in step S4, 30mL of tetrahydrofuran was used as the product of 1.1g of 1.69mmo L, 0.20g of 5.07mmo L of sodium hydroxide solution, and carboxylated ligand L as a white solid 1 0.83g, yield 82.5%.
Wherein, the preparation of the zirconium-based metal-organic framework material PCN-700 comprises the following steps:
s5, 200mg of ZrC l 4 100mg of 2,2' -dimethyl-4, 4' -biphenyldicarboxylic acid, 1.0mL of trifluoroacetic acid and 20mL of N, N ' -dimethylformamide were filled into Pyrex vials.
S6, heating the mixture in the bottle in an oven at 120 ℃ for 72 hours.
S7, cooling to room temperature, and preparing the zirconium-based metal-organic framework material PCN-700.
Wherein the metal-organic framework supported palladium nanoparticle composite material Pd@PCN-700-L 1 The preparation of the composition comprises the following steps:
s8, activating PCN-700 and L 1 Adding 4,4' -biphenyl dicarboxylic acid and 4mL of N, N ' -dimethylformamide into a 10mL glass bottle, carrying out ultrasonic treatment for 5 minutes, heating the mixture in an oven at 85 ℃ for 24 hours, washing the mixture by fresh N, N ' -dimethylformamide for multiple times, removing unreacted ligand in a pore canal, soaking the mixture in fresh DMF solution, and finally obtaining pale yellow crystal PCN-700-L 1
In the present embodiment, in the step S8, PCN-700 is 20mg 0.0106mmo l,L 1 1.5mg 0.0025mmo l,4,4' -Biphthalic acid 4.0mg 0.0165mmo L, crystalline PCN-700-L 1 Is 2300.81.
S9, 40mg of PCN-700-L 1 PdCl 4mg 2 And 5mL of acetonitrile solution were put into a 20mL glass vial, and the mixture was heated at 50℃for 30 hours, and after completion of the reaction, crystals were obtained by centrifugation.
S10, slowly adding the prepared NaBH into a small bottle filled with crystals 4 Reducing methanol solution for 20 min, removing salt and residual acetonitrile solution in pore canal with anhydrous methanol at least 3 times per day for 3 days, vacuum drying in vacuum oven at 65deg.C for 24 hr, and removing methanol to obtain black crystal Pd@PCN-700-L 1
Further, in the step S10, naBH 4 The methanol solution was 3mg of 0.08mmol, crystalline Pd@PCN-700-L 1 Pd in the catalyst was 6wt%.
According to the characteristics that zirconium-based metal-organic framework PCN-700 has two positions with different lengths (biphenyl and terphthalate), the invention designs a dicarboxylic acid ligand L with a terphenyl-like length 1 The main structure of the carboxylated phenyl-pyridine incorporates aza 18-crown-6, the functional building block L 1 The metal ion containing multiple electron donor N, O atoms can have good enrichment effect on metal cations and certain fixing and limiting effects on palladium ions. Meanwhile, the zirconium-based metal-organic framework PCN-700 finite field effect is utilized to cooperate with the ligand L 1 The catalytic unit and the palladium nano particles efficiently catalyze the Suzuki reaction.
Embodiment two:
based on the preparation method of the nanoparticle composite material for rapidly catalyzing suzuki reaction at room temperature in the first embodiment, application analysis is performed in the following application scene.
(1) Under air conditions, 3mg (0.001 mmol) of Pd@PCN-700-L 1 Adding 1mmol of p-bromobenzonitrile, 1.2 mmol of phenylboronic acid and 2.4 mmol of potassium carbonate into 3ml of deuterated methanol solution together for reaction for 15 minutes at room temperature, directly filtering after the experimental time is ended, and adding a nuclear magnetic internal standard CH into the obtained clear deuterated reaction solution 2 Br 2 The product yield was found to be 99% by analytical calculation of the peak area ratio of the product 4-cyanobiphenyl to the internal standard.
(2) Under air conditions, 3mg (0.001 mmol) of the composite Pd@PCN-700-L prepared in example 2 was reacted with 1 Adding 1mmol bromobenzene, 1.2 mmol phenylboric acid and 2.4 mmol potassium carbonate into 3ml methanol solution together, reacting for 15 minutes at room temperature, directly filtering after the experimental time, adding nuclear magnetic internal standard CH into the obtained clear deuterated reaction solution 2 Br 2 The product yield was found to be 98% by analytical calculation of the product biphenyl to internal standard peak area ratio.
(3) Under air conditions, 3mg (0.001 mmol) of the composite Pd@PCN-700-L prepared in example 2 was reacted with 1 Adding 1mmol of p-bromotoluene, 1.2 mmol of phenylboronic acid and 2.4 mmol of potassium carbonate into 3ml of methanol solution together for reaction for 15 minutes at room temperature, directly filtering after the experimental time is ended, and adding a nuclear magnetic internal standard CH into the obtained clear deuterated reaction solution 2 Br 2 The product yield was found to be 99% by analytical calculation of the peak area ratio of the product 4-methylbiphenyl to the internal standard.
(4) Under air conditions, 3mg (0.001 mmol) of the composite Pd@PCN-700-L prepared in example 2 was reacted with 1 Adding 1mmol of p-chlorobenzonitrile, 1.2 mmol of phenylboric acid and 2.4 mmol of potassium carbonate into 3ml of methanol solution together for reaction for 1 hour at 40 ℃, directly filtering after the experimental time is ended, and adding a nuclear magnetic internal standard CH into the obtained clear deuterated reaction solution 2 Br 2 The product yield was found to be 99% by analytical calculation of the peak area ratio of the product 4-cyanobiphenyl to the internal standard.
(5) Under air conditions, 3mg (0.001 mmol) of the composition of example 2 was preparedPrepared composite Pd@PCN-700-L 1 Adding 1mmol of p-chlorotoluene, 1.2 mmol of phenylboronic acid and 2.4 mmol of potassium carbonate into 3ml of methanol solution together for reaction for 1 hour at 40 ℃, directly filtering after the experimental time is ended, and adding a nuclear magnetic internal standard CH into the obtained clear deuterated reaction solution 2 Br 2 The product yield was found to be 99% by analytical calculation of the peak area ratio of the product 4-methylbiphenyl to the internal standard.
The metal-organic framework supported palladium nanoparticle composite material prepared by the method is simple in preparation method, mild in reaction condition and low in cost, and raw materials can be purchased commercially. The application of Suzuk i catalytic activity can be used for mild and rapid reaction under the air condition to obtain the expected product, and the gram-scale reactant is catalyzed by 0.1 mol% of low catalyst, so that the expected product is obtained in high yield. The prepared metal-organic framework supported palladium nanoparticle composite material has good application value and good application potential.
Embodiment III:
based on the application scenario listed in the second embodiment, the comparative example in this embodiment is compared, where the comparative example is:
under air conditions, 3mg (0.001 mmol) of the composite Pd@PCN-700-L prepared in example 2 was reacted with 1 Adding 1mmol of p-chlorotoluene, 1.2 mmol of phenylboronic acid and 2.4 mmol of potassium carbonate into 3ml of methanol solution together for reaction for 1 hour at 40 ℃, directly filtering after the experimental time is ended, and adding a nuclear magnetic internal standard CH into the obtained clear deuterated reaction solution 2 Br 2 The product yield was found to be 99% by analytical calculation of the peak area ratio of the product 4-methylbiphenyl to the internal standard.
The functional construction unit L 1 The catalyst comprises a plurality of electron supply N, O atoms, pd can be enriched in the pore canal after being coordinated with palladium, the catalyst provides possibility for further reduction, palladium nano particles on the surface of the metal-organic framework are well dispersed and quite uniform in size after being reduced by a reducing agent, the size of the palladium nano particles is between 20 and 25nm, and a Scanning Electron Microscope (SEM) is shown in figure 4. The method can rapidly catalyze the Suzuki reaction at room temperature under the condition of air, and has high activity, simple reaction treatment,The reaction condition is mild, and the solvent accords with green chemistry. Introduction of catalytic Unit ligand L 1 By utilizing the finite field effect of PCN-700 nanometer pore canal of the metal-organic framework material, the catalyst not only has good cross-coupling catalytic activity on bromobenzene and phenylboronic acid, but also has high catalytic performance on chlorobenzene with poor reaction activity, namely, the catalyst can rapidly catalyze Suzuki reaction at 40 ℃ under the air condition to obtain the expected product.
The beneficial effects of the invention are as follows:
1. the preparation method of the nanoparticle composite material for rapidly catalyzing SUZUKI reaction at room temperature has the advantages of simpler preparation method, milder reaction conditions, commercially available raw materials, low price and the like, and the clamp-aza crown ether ligand L with room temperature SUZUKI reaction is successfully introduced into the PCN-700 material by adopting a post-modification synthesis strategy 1 The functional construction unit L 1 The palladium nano particles on the surface of the metal-organic framework are well dispersed and have very uniform size, and the size of the palladium nano particles is between 20 and 25nm after the palladium nano particles are reduced by a reducing agent.
2. The nanoparticle composite material can rapidly catalyze the Suzuki reaction at room temperature under the air condition, and has the advantages of high activity, simple reaction treatment, mild reaction condition, environment-friendly chemical compliance of a solvent and the like. Under the finite field effect of a PCN-700 nanometer pore canal of a metal-organic framework material, the catalyst shows good cross-coupling catalytic activity on bromobenzene and phenylboronic acid, and simultaneously has high catalytic performance on chlorobenzene with poor reaction activity, namely, the catalyst rapidly catalyzes Suzuki reaction at 40 ℃ under the air condition to obtain an expected product.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A preparation method of a nanoparticle composite material for rapidly catalyzing suzuki reaction at room temperature is characterized by comprising the step of preparing a nanoparticle composite material based on a clamp-aza crown ether ligand L 1 And zirconium-based metal-organic framework material PCN-700 Metal-organic framework supported palladium nanoparticle composite Pd@PCN-700-L 1 Is prepared by the steps of (1);
wherein the clamp-aza crown ether ligand L 1 The preparation of the composition comprises the following steps:
s1, under the nitrogen environment, adding (3, 6-dibromopyridine-2-yl) methanol, 4-ethoxycarbonyl phenylboronic acid, tetrakis (triphenylphosphine) palladium, sodium carbonate, dioxane and water into the mixture for reaction to obtain a product of diethyl 4,4' - (6- (hydroxymethyl pyridine-2, 5-diyl) dibenzoate;
s2, diethyl 4,4' - (6-hydroxymethylpyridine-2, 5-diyl) dibenzoate and CBr 4 And 25mL of ultra-dry tetrahydrofuran were incorporated into a 50mL flask, and PPh was added with stirring 3 Reacting for 12 hours at normal temperature to obtain a product of diethyl 4,4' - (6- (bromomethyl) pyridine-2, 5-diyl) dibenzoate;
s3, adding diethyl 4,4'- (6- (bromomethyl) pyridine-2, 5-diyl) dibenzoate, aza-18-crown-6, triethylamine and toluene solution into the mixture for reaction, heating and refluxing for 24 hours, stopping the reaction, evaporating and concentrating to obtain dark red solid, purifying by silica gel column chromatography, and finally obtaining yellow liquid product, namely diethyl crown ether structural unit-containing clamp-like ligand 4,4' - (6- (1, 4,7,10, 13-pentaoxa-16-azacyclooctadecane-16-yl) methyl) pyridine-2, 5-dibenzoate;
s4, heating the suspension of the product obtained in the step S3 in 30mL of tetrahydrofuran to 65 ℃ for reacting for half an hour, adding 30mL of sodium hydroxide solution, continuing to react for 24 hours, evaporating and spin-drying the tetrahydrofuran, adding dilute hydrochloric acid, acidifying until a large amount of precipitate is formed, and filtering to obtain white solid carboxylated ligand L 1
Wherein, the preparation of the zirconium-based metal-organic framework material PCN-700 comprises the following steps:
s5, 200mg of ZrCl 4 100mg of 2,2' -dimethyl-4, 4' -biphenyldicarboxylic acid, 1.0mL of trifluoroacetic acid and 20mL of N, N ' -dimethylformamide were filled into Pyrex vials;
s6, heating the mixture in the bottle in a baking oven at 120 ℃ for 72 hours;
s7, cooling to room temperature, and preparing a zirconium-based metal-organic framework material PCN-700;
wherein the metal-organic framework supported palladium nanoparticle composite material Pd@PCN-700-L 1 The preparation of the composition comprises the following steps:
s8, activating PCN-700 and L 1 Adding 4,4' -biphenyl dicarboxylic acid and 4mL of N, N ' -dimethylformamide into a 10mL glass bottle, carrying out ultrasonic treatment for 5 minutes, heating the mixture in an oven at 85 ℃ for 24 hours, washing the mixture by fresh N, N ' -dimethylformamide for multiple times, removing unreacted ligand in a pore canal, soaking the mixture in fresh DMF solution, and finally obtaining pale yellow crystal PCN-700-L 1
S9, 40mg of PCN-700-L 1 PdCl 4mg 2 And 5mL acetonitrile solution are filled into a 20mL glass vial, the mixture is heated for 30 hours at 50 ℃, the reaction is finished, and crystals are obtained by centrifugation;
s10, slowly adding the prepared NaBH into a small bottle filled with crystals 4 Reducing with methanol solution for 20 min, removing salt and residual acetonitrile solution in pore canal with anhydrous methanol at least 3 times per dayDisplacing for 3 days, vacuum drying at 65deg.C for 24 hr, and removing methanol to obtain black crystal Pd@PCN-700-L 1
2. The method for preparing the nanoparticle composite material for rapidly catalyzing Suzuki reaction at room temperature according to claim 1, wherein in the step S1, (3, 6-dibromopyridin-2-yl) methanol is 5.34g 20mmol, 4-ethoxycarbonylphenylboronic acid is 9.31g 48mmol, tetrakis (triphenylphosphine) palladium is 80mg 0.069mmol, sodium carbonate is 10.18g,96mmol, dioxane is 300mL, and water is 50mL.
3. The method for preparing a nanoparticle composite material for rapidly catalyzing suzuki reaction at room temperature according to claim 1, wherein in the step S1, the reaction time is 40 hours, the reaction temperature is 105 ℃, and 6.86g of product is obtained, and the yield of the product is 84.6%.
4. The method for preparing a nanoparticle composite material for rapidly catalyzing Suzuki reaction at room temperature according to claim 1, wherein in the step S2, the diethyl 4,4' - (6-hydroxymethylpyridine-2, 5-diyl) dibenzoate is 2.03g,5mmol, CBr 4 2.49g of 7.5mmol gave 1.67g of product in 71.6% yield.
5. The method for preparing a nanoparticle composite material for rapid catalysis of Suzuki reaction at room temperature according to claim 1, wherein in the step S3, diethyl 4,4'- (6- (bromomethyl) pyridine-2, 5-diyl) dibenzoate is 1.50g,3.21mmol, aza-18-crown-6 is 0.93g,3.53mmol, triethylamine is 0.4g, and the obtained clamp-like ligand 4,4' - (6- (1, 4,7,10, 13-pentaoxa-16-azacyclooctadec-16-yl) methyl) pyridine-2, 5-dibenzoate is 1.67g, and the clamp-like ligand yield is 76.6%.
6. The method for preparing the nano particle composite material for rapidly catalyzing Suzuki reaction at room temperature according to claim 1,characterized in that in the step S4, the product in 30mL of tetrahydrofuran is 1.1g of 1.69mmol, the sodium hydroxide solution is 0.20g of 5.07mmol, and the ligand L is carboxylated by a white solid 1 0.83g, yield 82.5%.
7. The method for preparing a nanoparticle composite material for rapidly catalyzing Suzuki reaction at room temperature according to claim 1, wherein in the step S8, PCN-700 is 20mg 0.0106mmol,L 1 Crystalline PCN-700-L of 1.5mg 0.0025mmol,4,4' -biphenyldicarboxylic acid 4.0mg 0.0165mmol 1 Is 2300.81.
8. The method for preparing a nanoparticle composite material for rapidly catalyzing Suzuki reaction at room temperature according to claim 1, wherein in the step S10, naBH is adopted 4 The methanol solution was 3mg of 0.08mmol, crystalline Pd@PCN-700-L 1 Pd in the catalyst was 6wt%.
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