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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

Inactive Publication Date: 2016-11-02
GUANGXI NORMAL UNIV
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Problems solved by technology

With the in-depth study of the relaxation mechanism of single-molecule magnets by scientific researchers, and with the rapid development of characterization technology, more and more rare-earth single-molecule magnets with practical value have been synthesized, but the currently reported ones are based on acylhydrazone There are relatively few rare earth magnetic materials with Schiff bases as ligands, and no chemical formula [Dy 2 L 2 (CH 3 COO) 2 (DMF) 2 ] Related reports on rare earth magnetic materials

Method used

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  • A kind of magnetic material constructed with acylhydrazone Schiff base as a ligand and its preparation method
  • A kind of magnetic material constructed with acylhydrazone Schiff base as a ligand and its preparation method
  • A kind of magnetic material constructed with acylhydrazone Schiff base as a ligand and its preparation method

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Experimental program
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Effect test

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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Abstract

The invention discloses a magnetic material constructed by adopting acryl hydrazone Schiff base as a ligand and a preparation method of the magnetic material. The chemical formula of the magnetic material is [Dy2L2(CH3COO)2(DMF)2], wherein L is 2-aldehyde-8-hydroxyquinoline salicyloyl hydrazone, and DMF is N,N-dimethylformamide. The preparation method of the magnetic material comprises the following steps: dissolving Dy(CH3COO)3 6H2O and 2-aldehyde-8-hydroxyquinoline salicyloyl hydrazone in a mixed solvent of anhydrous methyl alcohol and N,N-dimethylformamide to obtain a solution, adjusting the pH of the solution to 7.5 to 9.5, placing the mixed solution into a container, freezing, vacuumizing, fusion sealing, and facilitating the reaction at the condition of 60 to 100 DEG C to obtain the magnetic material. The magnetic material is integrally embodied in paramagnetism. The preparation method is simple, low in cost, relatively high in yield and good in repeatability.

Description

technical field [0001] The invention relates to a magnetic material constructed with an acylhydrazone Schiff base as a ligand and a preparation method thereof, belonging to the technical field of magnetic materials. Background technique [0002] Schiff base is a very important class of ligands, it has a variety of forms, from the structural analysis, R 1 R 2 C=NR 3 (R 1 , R 2 , R 3 can be alkyl, hydrogen, cyclohexyl, aryl or heterocycle) in R 1 , R 2 , R 3 Can be substituted by various groups. The core of the Schiff base is the C=N group, and the lone pair of electrons on the hybrid orbital of the nitrogen atom endows it with important chemical and biological significance. As a special kind of Schiff base, acylhydrazone has a very strong coordination ability. It can form complexes with transition metals and rare earth ions. The complexes are used in analysis, catalysis, optical materials, magnetic materials, especially in biological The field of chemistry has pract...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/42C07F5/00
Inventor 邹华红徐申志梁福沛
Owner GUANGXI NORMAL UNIV
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