A kind of magnetic material constructed with acylhydrazone Schiff base as a ligand and its preparation method
A technology of magnetic materials and Schiff bases, applied in the direction of magnetism of organic materials/organic magnetic materials, chemical instruments and methods, compounds containing elements of group 3/13 of the periodic table, etc., can solve the problem of rare earth magnetic materials that have not yet been seen low cost of raw materials, good repeatability and high yield
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Embodiment 1
[0033] The magnetic material [Dy 2 L 2 (CH 3 COO) 2 (DMF) 2 ], where L is 2-formyl-8-hydroxyquinoline salicylhydrazone, and DMF is N,N-dimethylformamide.
[0034] The above-mentioned magnetic material [Dy 2 L 2 (CH 3 COO) 2 (DMF) 2 ] The preparation method is:
[0035] Weigh the analytically pure Dy(CH 3 COO) 3 ·6H 2 O and 2-formyl-8-hydroxyquinoline salicylhydrazone (wherein Dy(CH 3 COO) 3 ·6H 2 O is 0.1mmol, that is, 0.0898g), put it in a beaker, then add a mixed solvent consisting of 1.6mL of anhydrous methanol and 0.8mL of N,N-dimethylformamide, dissolve, shake well, and then use analytical pure three Ethylamine was used to adjust the pH of the obtained solution to 8; the obtained mixed solution was transferred into a Pyrex thick-walled glass tube about 25 cm long, and the tube was vacuum-sealed by freezing with liquid nitrogen, and then the fused-sealed Pyrex thick-walled glass tube was placed at 80°C Reaction under heat preservation for 48h; natural cooli...
Embodiment 2
[0047] Repeat Example 1, except that:
[0048] 1) Dy(CH 3 COO) 3 ·6H 2 The amount of O is changed to 0.05mmol, which is 0.0449g;
[0049] 2) Change the mixed solvent to consist of 1.4mL of anhydrous methanol and 0.7mL of N,N-dimethylformamide;
[0050] 3) adjust the pH value of the solution to 8.5;
[0051] 4) The reaction temperature is controlled at 90°C, and the reaction time is controlled at 24h.
[0052] The obtained product was characterized by single crystal structure and X-ray powder diffraction, and it was determined that the target product was a magnetic material [Dy 2 L 2 (CH 3 COO) 2 (DMF) 2 ], the characterization of the magnetic properties of the product shows that the obtained magnetic material is χ at room temperature M T is 31.2cm 3 Kmol -1 , as the temperature decreases, χ m T increases gradually and reaches a maximum value of 62.4cm at 2K 3 Kmol -1 . and χ M –1 The -T curve obeys the Curie-Weiss law, and the Weiss constant is 44.9K and the ...
Embodiment 3
[0054] Example 1 was repeated except that the pH of the solution was adjusted to 9.0.
[0055] The obtained product was characterized by single crystal structure and X-ray powder diffraction, and it was determined that the target product was a magnetic material [Dy 2 L 2 (CH 3 COO) 2 (DMF) 2 ], the characterization of the magnetic properties of the product shows that the obtained magnetic material is χ at room temperature M T is 31.2cm 3 Kmol -1 , as the temperature decreases, χ m T increases gradually and reaches a maximum value of 62.4cm at 2K 3 Kmol -1 . and χ M –1 The -T curve obeys the Curie-Weiss law, and the Weiss constant is 44.9K and the Curie constant is 58.2cm. 3 Kmol –1 . Positive Weiss constant and χ M The trends of T-T curves all indicate that there is ferromagnetic exchange between dysprosium ions in the molecule, and the overall performance is paramagnetic.
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