Preparation and application of molecular-based low-temperature magnetic refrigeration material of cobalt-gadolinium cluster base

A low-temperature magnetic refrigeration, molecular-based technology, applied in the fields of magnetic materials, inorganic material magnetism, inductor/transformer/magnet manufacturing, etc., can solve the problems of long-term solvothermal reaction or heating reflux reaction, high energy consumption of the method, and achieve convenient operation. , good repeatability, simple raw material effect

Inactive Publication Date: 2017-12-29
ANYANG INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although most of the Co-Gd molecular clusters reported above have high magnetic entropy, the synthesis of such Co-Gd molecular clusters requires a long period of solvothermal reaction or heating reflux reaction, and the method used requires high energy consumption.
At present, there is still no public research report on the synthesis of cluster-based low-temperature magnetic refrigeration materials using cobalt-gadolinium ions and diethanolamine as a ligand. Reaction, the method of preparing cobalt-gadolinium cluster-based molecular-based low-temperature magnetic refrigeration materials, and the application of this new material also needs further research

Method used

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  • Preparation and application of molecular-based low-temperature magnetic refrigeration material of cobalt-gadolinium cluster base
  • Preparation and application of molecular-based low-temperature magnetic refrigeration material of cobalt-gadolinium cluster base
  • Preparation and application of molecular-based low-temperature magnetic refrigeration material of cobalt-gadolinium cluster base

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, 0.3mmol GdCl 3 ·6H 2 O, 0.8 mmol CoCl 2 ·6H 2 O, 1.7 mmol of organic ligand diethanolamine was placed in a round-bottomed flask, and 10 mL of organic solvent methanol was added, and after magnetic stirring for 10 minutes, 1 mmol of sodium methoxide was added, and stirring was continued for 6 hours. The resulting mixed solution was filtered, the filtrate was placed in a beaker, covered with a perforated plastic wrap, and left to volatilize naturally at room temperature for 5 days to obtain blocky black crystals with good crystallinity, which were washed with methanol, Suction filtration, and dry at room temperature, prepare the molecule-based low-temperature magnetic refrigeration material of cobalt-gadolinium cluster group, productive rate 55% (with GdCl 3 ·6H 2 O meter).

[0033] Analysis of the single crystal diffraction data of the prepared black block crystals in this example shows that the molecular formula of the complex is [Co 8 Gd 2 (L...

Embodiment 2

[0037] In this embodiment, 0.3mmol GdCl 3 ·6H 2 O, 1 mmol CoCl 2 ·6H 2 O, 2mmol of organic ligand diethanolamine was placed in a round bottom flask, 15mL of organic solvent methanol was added, and after magnetic stirring for 10 minutes, 1.2mmol of sodium methoxide was added, and stirring was continued for 8 hours. The resulting mixed solution was filtered, the filtrate was placed in a beaker, covered with a perforated plastic wrap, and allowed to stand at room temperature for natural volatilization for 6 days to obtain blocky black crystals with good crystallinity. The obtained blocky black crystals were washed with methanol, Suction filtration, and dry at room temperature, prepare the molecule-based low-temperature magnetic refrigeration material of cobalt-gadolinium cluster group, productive rate 56% (with GdCl 3 ·6H 2 O meter). The various characterizations and results of the target product obtained are the same as in Example 1.

Embodiment 3

[0039] In this embodiment, 0.4mmol GdCl 3 ·6H 2 O, 1.2 mmol CoCl 2 ·6H 2 O, 2.3 mmol of organic ligand diethanolamine was placed in a round-bottomed flask, 20 mL of organic solvent methanol was added, and after magnetic stirring for 10 minutes, 1.5 mmol of sodium methoxide was added, and stirring was continued for 10 hours. The resulting mixed solution was filtered, the filtrate was placed in a beaker, covered with a perforated plastic wrap, and allowed to stand at room temperature for natural volatilization for 7 days to obtain blocky black crystals with good crystallinity. The obtained blocky black crystals were washed with methanol, Suction filtration, and dry at room temperature, prepare the molecule-based low-temperature magnetic refrigeration material of cobalt-gadolinium cluster group, productive rate 58% (with GdCl 3 ·6H 2 O meter). The various characterizations and results of the target product obtained are the same as in Example 1.

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Abstract

The invention discloses preparation and application of a molecular-based low-temperature magnetic refrigeration material of cobalt-gadolinium cluster base, and belongs to the field of inorganic chemistry. Gadolinium chloride, cobalt chloride, sodium methylate and diethanol amine are adopted as raw materials, methyl alcohol is adopted as a solvent, and a self-assembly reaction is carried out at normal temperature to prepare the molecular-based low-temperature magnetic refrigeration material of the cobalt-gadolinium cluster base. The structure of the prepared low-temperature magnetic refrigeration material is characterized in that the molecular formula is [Co8Gd2(L)4(HL)4(HCOO)4(OH)2(Cl)2(CH3OH)2]2Cl-.4CH3OH.2H2O, the molecular weight is 2199.12, and according to crystallography data, the value of alpha is equal to 71.009(2)o, the value of beta is equal to 67.615(2)o, the value of gamma is equal to 65.536(2)o, the value of z is equal to 1, the material belongs to a triclinic crystal, the space property of the material belongs to P-1 space groups, and specific information is shown in the description. The material has excellent low-temperature magnetic refrigeration performance; when the temperature is 3 K, by magnetizing the material at the constant temperature, the maximum magnetic entropy change can reach 16.3 J / (kg K) when an applied magnetic field is 5T. The raw materials are easy to obtain, and the preparation method can save energy, and is convenient to operate and great in repeatability.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry and can also be classified into the field of material chemistry, and specifically relates to the preparation and application of a cobalt-gadolinium cluster-based molecular-based low-temperature magnetic refrigeration material. Background technique [0002] Liquid helium refrigeration is currently the most important low-temperature refrigeration method, but the source of liquid helium is mainly natural gas, which is a non-renewable resource. There are not many natural gas deposits with high helium, because helium in natural gas is a radioactive element such as uranium product of decay. Helium can be collected in natural gas only when there are uranium mines near the natural gas mine, so natural gas is still the main source of helium in the world at present. [0003] The so-called magnetic refrigeration technology refers to a high-tech technology that uses the magnetocaloric effect exhibited by m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/01H01F41/00C07F19/00
CPCC07F15/065H01F1/017H01F41/00
Inventor 郁有祝郭玉华苏文辉杨立国吕会超刘娜娜申艳红牛永生
Owner ANYANG INST OF TECH
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