Rare earth europium coordination polymer having MnO4<-> detection function and preparation method thereof

A technology of coordination polymers and rare earths, applied in the chemical field, can solve the problem of few coordination polymers, and achieve the effects of high thermal stability temperature, high sensitivity, and mild reaction conditions

Active Publication Date: 2019-08-20
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, researchers have prepared a large number of coordination polymers with light-emitting properties by using various organic ligands to react with some rare earth metal ions, although some of them exhibited a s

Method used

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  • Rare earth europium coordination polymer having MnO4&lt;-&gt; detection function and preparation method thereof
  • Rare earth europium coordination polymer having MnO4&lt;-&gt; detection function and preparation method thereof
  • Rare earth europium coordination polymer having MnO4&lt;-&gt; detection function and preparation method thereof

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Example Embodiment

[0050] The coordination polymer provided by the present invention [Eu(L) 3 (H 2 O) 2 ] n The preparation method is simple, the reaction conditions are mild, the raw materials are cheap and easily available, and the solvent used is water, which will not pollute the environment. The preparation method specifically includes the following steps:

[0051] Step1: Mix europium nitrate hexahydrate, 3-methyl-4-cyanobenzoic acid and water at a molar ratio of 1:1:400-500, and stir evenly to obtain a mixed solution;

[0052] Step2: Seal the mixed liquid in the reaction kettle, heat it to 140~160℃, keep it for 60~96h;

[0053] Step3: Cool the reaction kettle to room temperature at a cooling rate of 5-8°C / h to obtain colorless block crystals.

Example Embodiment

[0054] Example 1

[0055] Step1: Mix europium nitrate hexahydrate, 3-methyl-4-cyanobenzoic acid and water at a molar ratio of 1:1:400, stir evenly to obtain a mixed solution;

[0056] Step2: Seal the mixture in a reaction kettle, heat it to 140°C and keep it for 96h;

[0057] Step3: Cool the reaction kettle to room temperature at a cooling rate of 5°C / h to obtain colorless block crystals.

[0058] After testing, the colorless bulk crystal is a coordination polymer [Eu(L) 3 (H 2 O) 2 ] n .

[0059] After calculation, the coordination polymer [Eu(L) 3 (H 2 O) 2 ] n The yield was 63%.

Example Embodiment

[0060] Example 2

[0061] Step1: Mix europium nitrate hexahydrate, 3-methyl-4-cyanobenzoic acid and water at a molar ratio of 1:1:450, stir evenly to obtain a mixed solution;

[0062] Step2: Seal the mixture in a reaction kettle, heat it to 150°C, and keep it for 80h;

[0063] Step3: Cool the reaction kettle to room temperature at a cooling rate of 5°C / h to obtain colorless block crystals.

[0064] After testing, the colorless bulk crystal is a coordination polymer [Eu(L) 3 (H 2 O) 2 ] n .

[0065] After calculation, the coordination polymer [Eu(L) 3 (H 2 O) 2 ] n The yield was 65%.

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Abstract

The invention discloses a rare earth europium coordination polymer having MnO4<-> detection function and a preparation method thereof. The chemical formula of the coordination polymer is [Eu(L)3(H2O)2]n. In the formula, L is a ligand, specifically minus monovalent negative ion of 3-methyl-4-cyanobenzoic acid. The coordination polymer belongs to the monoclinic system, P21/c space group. One asymmetric unit includes an independent Eu<3+>, three L ligands and two coordinated H2O. Each Eu<3+> center is coordinated with nine oxygen atoms. The nine oxygen atoms are respectively from seven carboxylicgroups and two coordinated H2O in six L ligands. Adjacent Eu<3+> are bridged through the L ligand to form a chain coordination polymer. Excitation wavelength is 394 nm, emission wavelengths are 577 nm, 591 nm, 617 nm, 652 nm and 697 nm, and bright red light which can be observed by naked eyes is shown. The invention has the following beneficial effects: the coordination polymer provided by the invention has the MnO4<-> detection function, has good selectivity, high sensitivity and low limit of detection, and can simply, rapidly and accurately detect MnO4<-> in a water phase.

Description

Technical field [0001] The invention relates to a coordination polymer and a preparation method thereof, in particular to a kind of MnO 4 - A rare earth europium coordination polymer with detection function and a preparation method thereof belong to the field of chemical technology. Background technique [0002] Potassium Permanganate (KMnO 4 ), as an important oxidant in laboratories and industrial production, it is widely used in the removal of pollutants such as As(Ⅲ) and harmful organics in sewage. When large-scale abuse and arbitrary discharge of KMnO 4 At that time, the environmental water will contain too much permanganate ion (MnO 4 - ), which will not only cause respiratory infections and skin irritation, but also cause environmental pollution and cause serious safety hazards. [0003] Therefore, in the field of analytical technology and environmental science, looking for fast and sensitive detection of MnO 4 - The method is very important for improving human health and pr...

Claims

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Application Information

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IPC IPC(8): C08G83/00G01N21/64
CPCC08G83/008G01N21/643G01N2021/6432
Inventor 侯磊刘歌刘洋卢瑜珂王尧宇
Owner NORTHWEST UNIV
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