Covalent organic framework material and its preparation method and application

A technology of covalent organic frameworks and products, applied in the direction of luminescent materials, chemical instruments and methods, identification devices, etc., to achieve the effect of simple preparation method, high yield, good chemical and physical stability

Active Publication Date: 2021-07-23
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a conjugated polymer, most COFs have fluorescent properties, but few COF materials can achieve two-photon fluorescence and responsive fluorescence at the same time.

Method used

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  • Covalent organic framework material and its preparation method and application
  • Covalent organic framework material and its preparation method and application
  • Covalent organic framework material and its preparation method and application

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preparation example Construction

[0045] Based on this, an embodiment of the present invention also provides a method for preparing a covalent organic framework material, comprising the following steps:

[0046] 1,3,5-m-(3-fluoro-4-formylphenyl)benzene, 1,4-terephthalonitrile and a catalyst are mixed in a solvent, and the resulting mixture is subjected to deoxygenation treatment, followed by solvothermal reaction.

[0047] The above preparation method adopts the solvothermal reaction of the monomer 1,3,5-m-(3-fluoro-4-formylphenyl)benzene and 1,4-terephthalonitrile in a solvent in the presence of a catalyst, by Simple steps to prepare covalent organic framework materials, the cost of synthetic equipment and medicines involved is low, and the synthesis method has high yield (~90%), high monomer utilization rate, and no environmentally harmful small molecular substances are produced, which is environmentally friendly .

[0048] In one specific embodiment, the solvent is n-butanol, or a mixture of n-butanol and ...

Embodiment 1

[0062] This embodiment provides a solvothermal preparation method of a covalent organic framework material, the covalent organic framework material (TF-sp 2 -COF) has the following structural features:

[0063]

[0064] Described preparation method comprises the steps:

[0065] (1) Weigh 57mg 1,3,5-m-(3-fluoro-4-formylphenyl)benzene, 15mg 1,4-terephthalonitrile and 42.03mg cesium carbonate, and disperse them in 2mL o-dichlorobenzene In the mixed solution of n-butanol (volume ratio 1:1), the oxygen and dissolved oxygen in the above mixed system are removed by freezing and thawing and deoxygenation;

[0066] (2) After the reaction system is completely thawed after the above-mentioned freezing and thawing cycle to remove oxygen, heat and stir in a metal bath at 120°C for 72 hours;

[0067] (3) The obtained product is cooled to room temperature, washed with tetrahydrofuran, dichloromethane, acetone, ethanol and deionized water respectively to obtain a yellow powdery product, ...

Embodiment 2

[0072] This embodiment provides the covalent organic framework material (TF-sp) described in embodiment 1 2 -COF) performance test.

[0073] 1. Crystallinity

[0074] The covalent organic framework material (TF-sp 2 -COF) powder X-ray diffraction spectrum as Figure 4 shown. Depend on Figure 4 It can be seen that the peak of the covalent organic framework material at about 2.7° is very sharp, corresponding to the diffraction peak of the (100) crystal plane, and two diffraction peaks appear at 4.6 and 7.1°, corresponding to the (110), (120) crystal plane, The advantage of the higher crystallinity of the covalent organic framework material is illustrated.

[0075] 2. Thermal stability

[0076] The covalent organic framework material (TF-sp 2 -COF) thermogravimetric analysis curve as Figure 5 shown. Depend on Figure 5 It can be seen that the weight loss of the covalent organic framework material is less than 10% at 542° C., indicating that the covalent organic framew...

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Abstract

The invention relates to a covalent organic framework material and its preparation method and application. The covalent organic framework material obtained through specific structural design and modification can have both responsive fluorescence and two-photon fluorescence properties, and can realize dual anti-counterfeiting applications, and has good chemical and physical stability, high crystallinity, and low density. , its macroscopic morphology can be regulated by traditional processing techniques.

Description

technical field [0001] The invention relates to the technical field of organic materials, in particular to a covalent organic framework material and its preparation method and application. Background technique [0002] Today, with the increasing development of the current commodity economy, counterfeiting has a greater impact on the safety and quality of commodities, thereby causing harm to society. At present, anti-counterfeiting technology has been deeply studied and widely used. Its application fields are not limited to product packaging and commodity authenticity verification, and there are also a large number of examples in file information encryption, currency and securities security, etc. From the traditional simple anti-counterfeiting through luminescence and discoloration, it is improved to use more advanced optical phenomena (such as interference, diffraction, etc.) The reliability and security have been further improved. At the same time, the invention and explo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C09K11/06G09F3/00
CPCC08G83/008C09K11/06C09K2211/1416C09K2211/1425G09F3/0294
Inventor 余丁山陈旭东房龙杨美佳
Owner SUN YAT SEN UNIV
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