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A method to improve the chemical stability of organic framework porous materials

A chemically stable and porous material technology, applied in the field of improving the chemical stability of organic framework porous materials, can solve problems such as COFs destruction, achieve the effects of improving acid resistance, wide application range, and simple process

Active Publication Date: 2021-03-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the later development of COFs materials linked by imine bonds has improved their chemical stability to a certain extent, COFs are still destroyed under harsh conditions such as strong acids and alkalis.

Method used

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  • A method to improve the chemical stability of organic framework porous materials
  • A method to improve the chemical stability of organic framework porous materials

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Embodiment 1

[0022] A method for improving the chemical stability of an organic framework porous material, the steps are as follows:

[0023] (1) In dry 1,2-dichloroethane solvent, add 50 mg of freshly prepared TF-Py COF material, and obtain a suspension of TF-Py COF by ultrasonic dispersion.

[0024] (2) Slowly add 0.052 g of o-carboxylic acid benzene diazonium into the suspension according to the molar ratio of its imine bond to TF-Py COF is 2:1.

[0025] (3) Under the condition of sufficient stirring, the temperature was raised to 100° C., the reaction was refluxed for 24 hours, and then the reaction was terminated.

[0026] (4) The reacted COFs powder was filtered, washed thoroughly with a large amount of anhydrous tetrahydrofuran and anhydrous acetone, and dried under vacuum at 80°C to obtain the modified TF-Py COF material. After standing the TF-Py COF before modification in the hydrochloric acid solution with pH = 1 or the sodium hydroxide solution with pH = 14 for 30 min, it was f...

Embodiment 2

[0028] A method for improving the chemical stability of an organic framework porous material. The reaction conditions and preparation steps are the same as in Example 1, except that the molar ratio of the alkyne compound to the COF imine bond is 1:1. After the treated TF-Py COF was left standing in the hydrochloric acid solution of pH=1 or the sodium hydroxide solution of pH=14 for 24 hours, the TF-Py COF still had a good crystal form.

Embodiment 3

[0030] A method for improving the chemical stability of organic framework porous materials, the reaction conditions and preparation steps are the same as those in Example 1, except that the reaction temperature is 140°C. After the treated TF-Py COF was left standing in the hydrochloric acid solution of pH=1 or the sodium hydroxide solution of pH=14 for 24 hours, the TF-Py COF still had a good crystal form.

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Abstract

The present invention provides a method for improving the chemical stability of an organic framework porous material, comprising the following steps: (1) disposing a newly prepared imino bond-type organic framework porous material (COFs) suspension in an aprotic solvent, and ultrasonically dispersing it. (2) The alkyne compound (or its precursor) is very slowly added to the COFs suspension according to its molar ratio to the imine bond of 2 to 1:1; (3) under sufficient stirring conditions, the temperature is increased to 100℃~140℃, reflux reaction for 24h, then terminate the reaction; (4) filter the reacted COFs powder, wash thoroughly with a large amount of anhydrous tetrahydrofuran and anhydrous acetone, and vacuum dry at 80℃ to obtain chemically stable COFs Material. The invention can effectively improve the chemical stability of the imino bond type COFs material, and the method has obvious effect and simple process. COFs with good stability can be used in catalysis, optoelectronic devices, gas storage and separation and other fields.

Description

technical field [0001] The invention belongs to the technical field of organic porous materials, and in particular relates to a method for improving the chemical stability of organic framework porous materials. Background technique [0002] Covalent organic frameworks (COFs) materials are a new type of organic porous materials developed on the basis of topology, which are tiny crystals formed by the covalent bonding of organic precursors. COFs materials have the advantages of MOFs materials, such as designable topology, regular structure, adjustable pore parameters, large specific surface area, and porosity. The difference is that it is combined through covalent bonds, and the material is a pure organic framework, so it is also called "organic molecular sieve". Since the emergence of COFs materials, their unique structure and superior performance have attracted extensive attention of scientific researchers, and their application research in gas adsorption, catalysis, photoe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07B63/02C07D215/54C07D215/56C07D215/02C07D221/10B01J31/22B01J20/22B01J20/28B01J20/30
CPCB01J20/226B01J20/28B01J20/3085B01J31/22C07B63/02C07B2200/13C07D215/02C07D215/54C07D215/56C07D221/10
Inventor 高艳安王宇王畅董彬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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