Asymmetric binuclear dysprosium single-molecular magnet based on diacylhydrazone as well as synthesis method and relaxation behavior of asymmetric binuclear dysprosium single-molecular magnet

The invention discloses an asymmetric binuclear dysprosium single-molecular magnet based on a diacylhydrazone ligand and a synthesis method and relaxation behavior thereof based on excellent magnetism, synthesis difficulty and existing scarcity of the asymmetric binuclear dysprosium single-molecular magnet. The magnet is prepared through a solvothermal reaction of a bis (halogen substituted salicylaldehyde) condensed 2, 6-nitrogen oxygen pyridine diformyl hydrazone ligand, dysprosium nitrate and triethylamine in a methanol-acetonitrile mixed solvent. The common structural characteristics are as follows: acylhydrazone pockets on two wings of the ligand are respectively chelated with a DyIII ion, and due to the difference between counter ions and solvent molecule coordination sites, the coordination geometric configurations of the two DyIII ions in the magnet are different, and a rare asymmetric dual-core structure based on the symmetric two-pole ligand is presented. The alternating-current magnetic susceptibil