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Multidentate pyridine ligand lanthanum metal coordination compound and preparation method thereof

A metal complex, multidentate pyridine technology, applied in the field of multidentate pyridine ligand lanthanum metal complex and its preparation, can solve the problems of high reaction temperature, poor repeatability, high risk, etc., and achieves mild reaction conditions, High productivity and improved energy efficiency

Inactive Publication Date: 2012-06-27
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The commonly used preparation methods of multidentate pyridine ligand metal complexes reported in the literature are hydrothermal and other synthetic methods, which have technical defects such as high reaction temperature, high risk, low yield and poor reproducibility.

Method used

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  • Multidentate pyridine ligand lanthanum metal coordination compound and preparation method thereof
  • Multidentate pyridine ligand lanthanum metal coordination compound and preparation method thereof
  • Multidentate pyridine ligand lanthanum metal coordination compound and preparation method thereof

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Embodiment 1

[0022] A preparation method of the multidentate pyridine ligand lanthanum metal complex, the steps are as follows:

[0023] 1) At room temperature, 70 mg of the ligand 2,3,6,7,10,11-hexa(2-pyridine)bispyrazine[2,3-f:2′,3′-h]quinoxaline HPDQ ( 0.1mmol) was dissolved in 10mL of dichloromethane, and the ligand solution was obtained after stirring evenly;

[0024] 2) At room temperature, the La(NO 3 ) 3 ·6H 2 O 130 mg (0.3 mmol) 3 Dissolve in 10mL of acetonitrile, stir well to obtain a metal salt solution;

[0025] 3) At room temperature, add 10 mL of HPDQ ligand solution to 10 mL of lanthanum nitrate metal salt solution to obtain a reaction solution, and stir for 2 hours;

[0026] 4) At room temperature, filter the reaction solution, and let the filtrate stand for 48 days to obtain a dark yellow massive single crystal, which is 2,3,6,7,10,11-hexa(2-pyridine)bispyrazine[2,3 -f: Lanthanum metal complexes of 2',3'-h]quinoxaline ligands.

Embodiment 2

[0028] A preparation method of the multidentate pyridine ligand lanthanum metal complex, the steps are as follows:

[0029] 1) At room temperature, 140 mg of the ligand 2,3,6,7,10,11-hexa(2-pyridine)bispyrazine[2,3-f:2′,3′-h]quinoxaline HPDQ ( 0.2mmol) was dissolved in 10mL of chloroform, and the ligand solution was obtained after stirring evenly;

[0030] 2) At room temperature, the La(NO 3 ) 3 ·6H 2 O 260mg (0.6mmol) 3 Dissolve in 10mL propionitrile, stir well to obtain a metal salt solution;

[0031] 3) At room temperature, add 10 mL of HPDQ ligand solution to 10 mL of lanthanum nitrate metal salt solution to obtain a reaction solution, and stir for 2 hours;

[0032] 4) At room temperature, filter the reaction solution, and let the filtrate stand for 43 days to obtain a dark yellow massive single crystal, which is 2,3,6,7,10,11-hexa(2-pyridine)bispyrazine[2,3 -f: Lanthanum metal complexes of 2',3'-h]quinoxaline ligands.

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Abstract

Provided is a multidentate pyridine ligand lanthanum metal coordination compound represented by chemical formula [La(NO3)3]6(HPDQ)2, wherein the HPDQ is 2, 3, 6, 7, 10, 11-six-(2-pyridine) dipyrazine [2, 3-f:2', 3'-h] quinoxaline. A preparation method comprises the steps of mixing and stirring a ligand solution prepared under the normal temperature and a metal salt solution, filtering mixture and standing filtrate. The preparation method has the advantages of performing synthesis under the normal temperature and being simple in process, mild in reaction condition, high in yield and good in reproducibility. The coordination compound can produce fluorescence and serves as a luminescent material to be widely applied in the fields including electroluminescence, chemical sensors, fluorescent polyethylene terephthalate (PET) sensors or fluorescent probes and the like. With continuous improvement and rapid development of luminescent material technology, the fact that the multidentate pyridine ligand lanthanum metal coordination compound can provide development opportunity for molecular engineering and molecular synthesis and has great significance in improvement of energy efficiency, reduction of manufacture cost and other aspects can be expected.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a multidentate pyridine ligand lanthanum metal complex and a preparation method thereof. Background technique [0002] Photoluminescence refers to the phenomenon that an object relies on an external light source for irradiation to obtain energy and generate excitation leading to luminescence. It roughly passes through three main stages: absorption, energy transfer, and light emission. The absorption and emission of light both occur between energy levels. The transitions between all go through the excited state. Energy transfer is due to the motion of excited states. Photoluminescence can provide some information about the structure, composition and environmental atomic arrangement of some materials. It is a non-destructive and highly sensitive analysis method. If laser is applied to this type of analysis method, it can Going deeper into the fields of micro-regions, selectiv...

Claims

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Application Information

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IPC IPC(8): C07F5/00C09K11/06
Inventor 卜显和赵强刘秀明宋伟朝胡同亮
Owner NANKAI UNIV
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