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Preparation method of rare earth metal organic framework material

An organic framework and rare earth metal technology, applied in the field of preparation of rare earth metal organic framework materials, can solve the problems of complex pretreatment, restricted application, time-consuming and other problems, and achieve the effect of huge application value, good chemical stability and high yield

Active Publication Date: 2018-12-14
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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Problems solved by technology

[0003] Although many advanced technologies such as atomic absorption method, liquid chromatography, inductively coupled plasma, spectroscopic analysis, and electrochemical methods have been developed to detect chromate ions and dichromate ions, these technologies are ubiquitous. Problems such as time-consuming, high cost, complicated pre-processing and the need for professionals seriously restrict their application

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  • Preparation method of rare earth metal organic framework material
  • Preparation method of rare earth metal organic framework material
  • Preparation method of rare earth metal organic framework material

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Embodiment Construction

[0030] The present embodiment is a kind of rare earth metal organic framework material, and its chemical formula is: {[(CH 3 ) 2 NH 2 ][Eu 4 (FDA) 7 (DMF) 2 0.5DMF]} n ,

[0031] In the formula: n is a natural number from 1 to positive infinity; FDA is obtained by deprotonation of 2,5-furandicarboxylic acid; DMF is N,N-dimethylformamide;

[0032] The material belongs to the monoclinic crystal system with space group P2 1 / n, the cell parameters are: α=90°, β=103.8210(10)°, γ=90°; there are two kinds of europium ions in the coordination environment in the basic structural unit of the material, and three half-dehydrogenated ligands FDA 2- , a coordinated DMF molecule and a quarter of a free DMF molecule and a dimethylamine cation; the dimethylamine cation derived from the decomposition of the DMF molecule acts as a counter cation, thereby maintaining the charge neutrality of the entire framework material ; One of the europium ions adopts a deformed dodecahedral coord...

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Abstract

The invention discloses a rare earth metal organic framework material, which has a chemical formula: {[(CH3)2NH2][Eu4(FDA)7(DMF)2.0.5DMF]}n. A preparation method of the framework material comprises the following steps: (1) respectively dissolving organic ligands H2FDA and 4,4'-diphenyldicarboxylic acid in N,N-dimethylformamide solvent; (2) dissolving Eu(NO3)3.6H2O in a N,N-dimethylformamide solvent containing nitric acid; (3) mixing the above two solutions, placing the mixture into a sealed hydrothermal reaction kettle, carrying out a reaction at a constant temperature for 72 hours, separatingsolids from products which are taken out from the reaction kettle; and (4) washing the solids for a plurality of times with N,N-dimethylformamide to obtain a colorless block-shaped crystal. The abstract drawings are three-dimensional structural drawings of the framework material. The preparation method of the framework material is simple and convenient in synthesis, easy to implement, high in yield, low in cost, good in reproducibility, stable in water and stable in solvents. The framework material can be used to detect the presence of Cr(VI) ions in water by fluorescence quenching effects.

Description

technical field [0001] The invention relates to a preparation method of a rare earth metal organic framework material, which belongs to the technical field of porous molecular crystal materials. Background technique [0002] Hexavalent chromium ion Cr(VI), especially chromate ion and dichromate ion, are widely used in pigments, leather tanning, electroplating and other fields. However, chromate ion and dichromate ion are also considered as one of many non-biodegradable environmental pollutants. Due to their ability to accumulate in organisms, they can cause various health problems. Excessive absorption of chromate ions and dichromate ions will cause pathological changes in the organs of organisms, resulting in cancer, deformities and gene mutations. The U.S. Environmental Agency clearly stipulates that the concentration of chromate ions and dichromate ions in drinking water should not exceed 100ppb. Therefore, it is imminent to be able to detect chromate and dichromate io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C08G83/00G01N21/64
CPCC08G83/008C09K11/06C09K2211/182G01N21/643G01N2021/6432
Inventor 邹吉勇李玲游胜勇谌开红陈衍华
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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