Dysprosium-based magnetic material as well as preparation method and application thereof

The invention belongs to the technical field of preparation of magnetic materials, and particularly relates to preparation and magnetic research of two dysprosium-containing compounds synthesized on the basis of tridentate Schiff base ligands, and the chemical formulas of the dysprosium-containing compounds are [Dy (HL-pyra) 2 (NO3) (H2O)]. 1.83 H2O (1) and [Dy (HL-pyri) 2 (NO3) (CH3OH)] (2) (HL-pyra = N3-(2-pyrazinyl)-3-pyridine formyl hydrazone and HL-pyri = N3-(2-pyridyl)-3-pyridine formyl hydrazone). The two compounds are prepared by dissolving an HL-pyra/HL-pyri ligand, Dy (NO3) 3.6 H2O, LiOH.H2O and pyridine in methanol and utilizing a solution volatilization method. The complex 1 and the complex 2 show a single-molecule magnet behavior in a zero direct current field, and the effective energy barriers of magnetic flipping are 63.53 K and 323.0 K respectively. Particularly, the complex 2 in a nine-coordination dysprosium-based coordination compound system has the highest energy barrier, is prepared at ro