A kind of gadolinium complex with high stability and high magnetocaloric effect and preparation method thereof
A high stability, complex technology, applied in chemical instruments and methods, organic compounds of group 3/13 without C-metal bonds, compounds containing elements of group 3/13 of the periodic table, etc. problems such as low efficiency, to achieve the effects of high yield, simple process, high acid-base and chemical stability
Inactive Publication Date: 2017-06-16
NANKAI UNIV
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At present, the main method of obtaining and maintaining low temperature is to use the compression-expansion cycle of liquid helium, which is inefficient and requires the use of rare and expensive 3 He, which further limits its application in the low temperature region
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[0016] A gadolinium complex with high stability and high magnetocaloric effect, its chemical formula is {[Gd(azdc)(COOH)]} n , wherein azdc is 4,4'- azodicarboxylic acid divalent anion; its preparation method steps are as follows:
[0017] 1) Add 0.05 mmol H 2 Azdc and 0.10 mmol of gadolinium chloride hexahydrate were added to a mixed solvent of 2.5 ml of DMF and 1.5 ml of distilled water, and then 100 μl of concentrated nitric acid (15.2 mol L -1 ) and 100 microliters of LiOH (1.0mol·L -1 ), to obtain the mixed solution;
[0018] 2) Seal the above mixture and place it in an oven at 140 o After heating and reacting at C temperature for 72 hours, at 2.5°C·min -1 Cool down to 30 o C, the filtered crystals were washed three times with distilled water and absolute ethanol, and dried to obtain pale yellow flaky gadolinium complex crystals.
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The invention discloses a gadolinium complex with the high stability and the high magnetocaloric effect as well as a preparation method of the gadolinium complex. The chemical formula of the gadolinium complex with the high stability and the high magnetocaloric effect is [(Gd(azdc)(COOH))]n, wherein azdc is a 4,4-azodicarboxylic acid bivalent anion. The preparation method of the gadolinium complex comprises steps as follows: 1) adding H2azdc and a gadolinium chloride hexahydrate to a mixed solvent of DMF and distilled water, and then sequentially adding nitric acid and an LiOH solution to obtain a mixed liquid; 2) heating the mixed liquid at the temperature of 140 DEG C for reactions for 72 h, and then performing cooling, filtration and washing to obtain gadolinium complex crystals. The gadolinium complex and the preparation method have the advantages as follows: the preparation method of the gadolinium complex is simple in process and high in yield, and a way is provided for preparation of a molecule-based magnetic refrigerant with the high magnetocaloric effect; a prepared gadolinium complex refrigeration material is high in thermal stability, acid and base stability and chemical stability and has potential application values in the aspect of magnetic refrigeration.
Description
technical field [0001] The invention relates to the preparation of magnetic refrigeration materials, in particular to a gadolinium complex with high stability and high magnetocaloric effect and a preparation method thereof. Background technique [0002] Cryogenic refrigeration technology plays an important role in aerospace, superconducting technology, gas liquefaction and other fields. At present, the main method of obtaining and maintaining low temperature is to use the compression-expansion cycle of liquid helium, which is inefficient and requires the use of rare and expensive 3 He further limits its application in the low temperature region. In recent years, environmental and energy issues have become increasingly prominent, which has promoted the development of magnetic refrigeration technology. Magnetic refrigeration technology refers to a new type of refrigeration technology with great potential to achieve refrigeration through isothermal magnetization and adiabatic...
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IPC IPC(8): C07F5/00C09K5/14
CPCC07F5/003C09K5/14
Inventor 程鹏张少伟
Owner NANKAI UNIV
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