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High stability polymer-based nano catalyst and preparation method and use thereof

A nano-gold and polymer technology, applied in the field of chemistry, can solve problems such as the lack of research reports on gold nanoparticles, and achieve the effects of simple synthesis, high stability, and high product reproducibility

Inactive Publication Date: 2009-02-11
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in general, research reports on gold nanoparticles with a particle size below 2nm and high stability and high catalytic activity are still relatively lacking.
In addition, in organic chemistry, the Suzuki coupling reaction of aryl halides and aryl boronic acids is one of the most effective and convenient synthetic approaches to generate biaryls, but the catalyst used has always been palladium, and gold has been successfully applied as a catalyst to The Suzuki Coupling Reaction of Aryl Halides and Arylboronic Acids Has Not Been Reported

Method used

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  • High stability polymer-based nano catalyst and preparation method and use thereof
  • High stability polymer-based nano catalyst and preparation method and use thereof
  • High stability polymer-based nano catalyst and preparation method and use thereof

Examples

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Effect test

Embodiment 1

[0035] Preparation of polymer-based nano-gold catalyst

[0036] (1) Raw material preparation: o-aminothiophenol was distilled under reduced pressure before use, and stored in a refrigerator at 4°C for later use. Chlorauric acid is prepared into a 0.1mol / L aqueous solution with deionized water before use. Other chemical reagents were of analytical grade, and water was deionized water.

[0037] (2) Synthesis and preparation: 0.05g of o-aminothiophenol is dissolved in 18.0ml, 1.0mol / L of HCl aqueous solution, fully mixed to obtain a homogeneous solution, and then 2.0ml of chloroauric acid is added to the system at one time Aqueous solution, keep the concentration of o-aminothiophenol in the reaction system at 0.02mol / L, the molar ratio of o-aminothiophenol to chloroauric acid is 2:1, stir fully for half a minute to make the reaction system evenly mixed, at 0-30℃ React within the temperature range for 12 hours.

[0038] (3) Post-treatment of the product: Centrifuge the reaction...

Embodiment 2

[0040] Preparation of polymer-based nano-gold catalyst

[0041] (1) Raw material preparation: o-aminothiophenol was distilled under reduced pressure before use, and stored in a refrigerator at 4°C for later use. Chlorauric acid is prepared into a 0.1mol / L aqueous solution with deionized water before use. Other chemical reagents were of analytical grade, and water was deionized water.

[0042] (2) Synthesis and preparation: 0.10g of o-aminothiophenol is dissolved in 16.0ml, 1.0mol / L of HCl aqueous solution, fully mixed to obtain a homogeneous solution, and then 4.0ml of chloroauric acid is added to the system at one time Aqueous solution, keep the concentration of o-aminothiophenol in the reaction system at 0.04mol / L, the molar ratio of o-aminothiophenol to chloroauric acid is 2:1, stir fully for half a minute to make the reaction system evenly mixed, at 0-30℃ React within the temperature range for 12 hours.

[0043] (3) Post-treatment of the product: Centrifuge the reaction...

Embodiment 3

[0045] Preparation of polymer-based nano-gold catalyst

[0046] (1) Preparation of raw materials: o-aminothiophenol was distilled under reduced pressure before use, and stored in a refrigerator at 4°C for later use. Chlorauric acid is prepared into a 0.1mol / L aqueous solution with deionized water before use. Other chemical reagents were of analytical grade, and water was deionized water.

[0047](2) Synthetic preparation: 0.20g of o-aminothiophenol is dissolved in 12.0ml, 1.0mol / L of HCl aqueous solution, fully mixed to obtain a homogeneous solution, and then 8.0ml of chloroauric acid is added to the system at one time Aqueous solution, keep the concentration of o-aminothiophenol in the reaction system at 0.08mol / L, the molar ratio of o-aminothiophenol to chloroauric acid is 2:1, stir fully for half a minute to make the reaction system evenly mixed, at 0-30℃ React within the temperature range for 12 hours.

[0048] (3) Post-treatment of the product: Centrifuge the reaction ...

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Abstract

The invention provides a nanometer gold catalyst based on high-stability polymer, a preparation method thereof and the application thereof. The nanometer gold catalyst based on high-stability polymer, the grain size of the nanometer gold of which is 1.0nm to 5.0nm and the macromolecular protective agent of which is poly-o-amino-thiophenol, is prepared by the method as follows: o-amino-thiophenol is dissolved in a 1.0mol / L hydrochloric acid water solution, the concentration of the o-amino-thiophenol is controlled to be 0.02-0.08mol / L; after being fully stirred, the obtained solution is added with a chloroauric acid water solution at one time, and the mole ratio of the o-amino-thiophenol and the chloroauric acid is controlled to be 1:1-8:1; and then the obtained solution is fully stirred for half a minute and reacts for 12h under the temperature between 0 DEG C to 30 DEG C to obtain the stable nanometer gold catalyst of poly-o-amino-thiophenol. The nanometer gold catalyst based on high-stability polymer has the advantages that the preparation of the nanometer gold catalyst is simple and convenient to be carried out, and the obtained nanometer gold catalyst is high in stability and good in reproducibility and has good catalytic activity to the Suzuki coupling reaction between aryl halide and aryl boronic acid.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a polymer-based nano-gold catalyst with high stability and high activity, its preparation method and its application in Suzuki coupling reaction. Background technique [0002] Gold nanoparticles, due to their unique optical and electrical properties, have many applications in the fields of electronics, optical devices, catalysis, nanotechnology and biotechnology. Currently, one of the focuses of applied research on gold nanoparticles is their catalytic activity in organic reactions. Gold nanoparticles have been successfully used in organocatalytic reactions such as glucose oxidation, alcohol oxidation, CO oxidation, and acrylic acid epoxidation. Due to the high specific surface area of ​​gold nanoparticles with small particle size, their catalytic activity is relatively high, but the high surface energy of gold nanoparticles with small particle size can easily lead to their mutual aggre...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J31/06C07C1/32C07B37/00
Inventor 郭荣韩杰刘艳
Owner YANGZHOU UNIV
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