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
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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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