A metal-organic framework fluorescent probe for recognizing paraquat and its preparation method and application
An organic framework, fluorescent probe technology, applied in fluorescence/phosphorescence, zinc organic compounds, chemical instruments and methods, etc., can solve the problem of less fluorescent probes, achieve low cost, sensitive fluorescence quenching response, high yield Effect
Active Publication Date: 2021-04-27
HUNAN UNIV OF SCI & TECH
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In recent years, fluorescent metal-organic framework materials have been widely used in the identification and detection of different species such as anions, cations, small organic molecules, volatile organic compounds, and explosives. However, there are still few fluorescent probes for the identification of pesticides reported so far. especially in bodies of water
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[0020] A water-stable metal-organic framework material sensitively recognizing paraquat with the chemical formula [Zn 2 (cptpy)(btc)(H 2 O)] n , wherein cptpy is 4-[4,2'; 6',4'']-terpyridine-4'-benzoic acid monovalent anion, btc is 1,3,5-benzenetricarboxylic acid trivalent anion; its preparation method Proceed as follows:
[0021] 1) Mix 0.05 mmol zinc nitrate hexahydrate, 0.05 mmol Hcptpy and 0.025 mmol H 3 btc was added to 2.0 milliliters of acetonitrile and 4.0 milliliters of distilled water to obtain a mixed solution;
[0022] 2) Transfer the above mixed solution to a 25 ml stainless steel reaction kettle lined with polytetrafluoroethylene, and heat up to 160°C in 3 hours o C, at 160 oC Keep it under for 72 hours, then cool down to 30 after 48 hours o C, light yellow block cluster crystals were obtained, the filtered crystals were washed three times with acetonitrile and water respectively, and dried to obtain the target product.
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The invention discloses a water-stable metal-organic framework fluorescent probe, whose chemical formula is [Zn 2 (cptpy)(btc)(H 2 O)] n , where cptpy is 4‑[4,2';6',4'']‑terpyridine‑4'‑benzoic acid monovalent anion, and btc is 1,3,5‑benzenetricarboxylic acid trivalent anion. Described compound belongs to monoclinic crystal system, and space group is P 2 1 / c. Its preparation method is to combine hexahydrate zinc nitrate, Hcptpy and H 3 Add btc to the mixed solvent of acetonitrile and water, at 160 o After C is fully reacted at constant temperature, filter and wash to obtain the target product. The invention has the advantages that: the material can exist stably in water, exhibits sensitive recognition to paraquat, and the fluorescent probe material does not need pretreatment or pretreatment is simple. At the same time, the material is a solid powder, which is convenient for storage and use. The synthesis method is simple and the yield is high. It has potential application value and good promotion and application prospects in the monitoring of environmental pollutants and food safety.
Description
technical field [0001] The invention relates to the preparation and application of a metal-organic framework, in particular to a metal-organic framework fluorescent probe for identifying paraquat in a water body, a preparation method and application thereof. Background technique [0002] With the development of agricultural industrialization, the production of agricultural products is increasingly dependent on exogenous substances such as pesticides, antibiotics and hormones. The amount of pesticides used in food, fruits and vegetables, and tea in my country remains high, and the unreasonable use of pesticides will lead to excessive pesticide residues in agricultural products, affecting people's food safety, and even death from poisoning. At the same time, excessive pesticide residues will also cause water and environmental pollution. pollution problem. In the foreseeable future, chemical control will still be the most convenient, effective and cheapest means of control, and...
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IPC IPC(8): C07F3/06C09K11/06G01N21/64
Inventor 张少伟曹译丹涂婧陈红娟
Owner HUNAN UNIV OF SCI & TECH