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Covalent organic framework material and preparation method and application thereof in fluorescence 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: 2019-09-17
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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  • Covalent organic framework material and preparation method and application thereof in fluorescence sensor
  • Covalent organic framework material and preparation method and application thereof in fluorescence sensor
  • Covalent organic framework material and preparation method and application thereof in fluorescence sensor

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

[0076] It should be noted that, in the following examples, the reagents and consumables are shown in Table 1, wherein, unless otherwise specified, all reagents are of analytical grade and used directly without further purification. The instruments are shown in Table 2.

[0077] Table 1

[0078]

[0079]

[0080] Table 2

[0081]

Embodiment 1

[0083] A preparation method of a covalent organic framework material (COFs-DT), comprising the steps of:

[0084] 1. The preparation of DHNDA, including:

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

[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) and step (1) into a 50mL round-bottomed flask to finally obtain The solution was stirred for 0.5h. Then dissolve 3.3g of 2,6-dihydroxynaphthalene with 21mL of absolute ethanol and add to the system, react for 1h; filter with a funnel to obtain a white solid, wash the filter cake with absolute ethanol several times, and put the filter cake in vacuum to dry Oven-dried for 6 hours to obtain an intermediate product (Mannich base);

[0087] (3) Weigh 1.72g of the intermediate product Mannich base and 2.46g of hexamethylenetetramine into 38mL of acet...

Embodiment 2

[0092] A preparation method of a covalent organic framework material (COFs-DT), comprising the steps of:

[0093] 1. The preparation of DHNDA, including:

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

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

[0096] (3) Weigh 1.5g of the intermediate product Mannich base and 2.2g of hexamethylenetetramine into 40mL of acetic acid (content: 81...

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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 framework material, a preparation method thereof and an application in a fluorescence sensor. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] Copper is one of the most basic trace elements in the human body and plays a vital role in many basic physiological processes. Imbalances in its homeostasis, including deficiencies or excesses, increase the risk of various diseases. For example, copper deficiency can lead to anemia as well as hypopigmentation and bone abnormalities, while copper excess can also lead to Wilson'...

Claims

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Application Information

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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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