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A kind of covalent organic framework material and its preparation method and application in fluorescent sensor

A covalent organic framework, fluorescence sensor technology, applied in luminescent materials, analytical materials, fluorescence/phosphorescence, etc., can solve the problems of sensitivity and reusability, poor chemically unstable excitons migration, etc., and achieve excellent thermal stability. , excellent stability, high fluorescence intensity effect

Active Publication Date: 2020-06-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventors believe that the sensitivity and reusability of fluorescence detection based on these materials are often affected, mainly due to the disorder of the molecular arrangement within the amorphous porous organoid or in water and acidic / alkaline media. The chemical instability of the exciton leads to poor mobility on the framework, such as the problem of metal-organic frameworks (MOFs)

Method used

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  • A kind of covalent organic framework material and its preparation method and application in fluorescent sensor
  • A kind of covalent organic framework material and its preparation method and application in fluorescent sensor
  • A kind of covalent organic framework material and its preparation method and application in fluorescent sensor

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preparation example Construction

[0075] As mentioned above, COFs as chemical sensors need to have high emission efficiency, good crystallinity and chemical stability, but the corresponding exploration in these aspects is far from enough. Therefore, the present invention provides a covalent organic framework material, a preparation method thereof, and an application in a fluorescent sensor; the present invention will now be further described with reference to the drawings and specific embodiments.

[0076] It should be noted that, in the following examples, the reagents and consumables are as shown in Table 1, where, if there is no special label, all reagents are of analytical grade and are used directly without additional purification. The instrument is shown in Table 2.

[0077] Table 1

[0078]

[0079]

[0080] Table 2

[0081]

Embodiment 1

[0083] A method for preparing covalent organic framework materials (COFs-DT) includes the following steps:

[0084] 1. Preparation of DHNDA, including:

[0085] (1) Under magnetic stirring, use 15 mL of absolute ethanol to dissolve 1.65 g of paraformaldehyde and 0.03 g of NaOH;

[0086] (2) In a low-temperature cold bath, set the temperature to 0°C, add an aqueous solution of dimethylamine (the mass ratio of dimethylamine:NaOH is 100:1) into a 50mL round-bottomed flask, and step (1) finally obtains The solution was stirred for 0.5h. Then 3.3g of 2,6-dihydroxynaphthalene was dissolved in 21mL of absolute ethanol and added to the system, reacted for 1h; filtered with a funnel to obtain a white solid, washed the filter cake with absolute ethanol several times, and put the filter cake into vacuum drying Dry in the oven for 6 hours to obtain the intermediate product (Mannich base);

[0087] (3) Weigh 1.72g of the intermediate product Mannich base and 2.46g of hexamethylenetetramine, add ...

Embodiment 2

[0092] A method for preparing covalent organic framework materials (COFs-DT) includes the following steps:

[0093] 1. Preparation of DHNDA, including:

[0094] (1) Under magnetic stirring, dissolve 1.7 g of paraformaldehyde and 0.05 g of NaOH with 25 mL of absolute ethanol;

[0095] (2) In the low-temperature cold bath, set the temperature to 0°C, add the dimethylamine aqueous solution (the mass ratio of dimethylamine:NaOH is 90:1) into a 50mL round-bottomed flask, and step (1) finally obtains The solution was stirred for 0.5h. Then 5.75g of 2,6-dihydroxynaphthalene was dissolved in 40mL of absolute ethanol and added to the system, reacted for 1h; filtered with a funnel to obtain a white solid, washed the filter cake with absolute ethanol several times, and put the filter cake into vacuum drying Dry in the oven for 6 hours to obtain the intermediate product (Mannich base);

[0096] (3) Weigh 1.5g of the intermediate product Mannich base and 2.2g of hexamethylenetetramine, add them ...

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Abstract

The invention belongs to the technical field of environmental detection, and particularly relates to a covalent organic framework material, a preparation method thereof and application thereof in a fluorescent sensor. The covalent organic framework material (COFS-DT) is obtained by reacting monomers 2,6-dihydroxynaphthalene-1,5-dialdehyde (DHNDA) and 1,3,5-tris (4-aminophenyl) benzene (TAPB) through Schiff base reaction by a solvothermal method. The crystallinity, porosity and chemical stability of the COFS-DT are improved through O-H..N = C hydrogen bond interaction, and the COFS-DT is connected with many bidentate coordination sites interacting with target ions. Compared with the monomers, the COFS-DT shows stronger fluorescence when dispersed in isopropanol. The strong fluorescence and the bidentate coordination sites enable the COFS-DT to be used to construct a high-performance fluorescence sensor with high sensitivity, high selectivity and high stability for detecting Cu<2+>.

Description

Technical field [0001] The invention belongs to the technical field of environmental detection, and in particular relates to a covalent organic frame material, a preparation method thereof, and application in a fluorescence sensor. Background technique [0002] The information disclosed in the background of the present invention is only intended to increase the understanding of the overall background of the present invention, and is not necessarily regarded as an acknowledgement or any form of suggestion that the information constitutes the prior art known to those of ordinary skill in the art. [0003] Copper is one of the most basic trace elements in the human body, and it plays a vital role in many basic physiological processes. Disorders of its homeostasis, including insufficient or excessive, will increase the risk of various diseases. For example, copper deficiency can lead to anemia and hypopigmentation and bone abnormalities, while excessive copper can also cause Wilson's ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/08C09K11/06G01N21/64
CPCC08G12/08C09K11/06C09K2211/1408G01N21/6428G01N21/643G01N2021/6432
Inventor 张晓梅崔超
Owner SHANDONG UNIV
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