Rare earth single-ion magnet based on bis-salicylaldehyde nitrogen oxide pyridine-2, 6-diformyl hydrazone and preparation method of rare earth single-ion magnet

Abstract

The invention discloses a rare earth monomolecular magnet based on bis-salicylaldehyde nitrogen oxide pyridine-2, 6-diformyl hydrazone and a preparation method of the rare earth monomolecular magnet based on bis-salicylaldehyde nitrogen oxide pyridine-2, 6-diformyl hydrazone. The magnet is synthesized in a vacuum solvent tube through a low-temperature solvothermal method by taking bis-salicylaldehyde nitrogen oxide pyridine-2, 6-diformyl hydrazone (H4sapho) ligand, dysprosium nitrate and triethylamine as raw materials. The crystal is in a P21 / n space group of a monoclinic system, and the molecular formula of the crystal is [Dy (H3sapo) (NO3) 2 (CH3OH) 2]. CH3OH, the compound is of a mononuclear structure formed by chelating an acylhydrazone group on one wing of a single H3sapo-ligand and two nitrate ions with a DyIII ion together. And two adjacent molecules are connected through an intermolecular hydrogen bond to form a dimer. Thermogravimetric and powder diffraction tests respectively show that the magnet has good stability and phase purity. The alternating-current magnetic susceptibility of the magnet shows a frequency-dependent single-ion magnet behavior in a zero field. After the quantum tunneling effect is suppressed by an external magnetic field, the frequency dependence behavior is more obvious, and the effective energy barrier and relaxation time are 29.10 cm <-1 > (40.74 K) and 3.6 * 10 <-5 > s respectively.

Description

technical field [0001] The invention relates to the preparation of new rare earth molecular-based magnetic materials, especially a rare earth single ion magnet with novel structure and excellent magnetic properties and its preparation method. Background technique [0002] Single-ion magnets are a new type of molecular-based magnetic materials mainly formed by mononuclear complexes. Because a single molecule is the basic unit of a magnetic domain, it has attractive potential application prospects in high-density information storage, quantum computers, and molecular spintronics. Compared with transition metal single-ion magnets, rare earth single-ion magnets have gradually become one of the more ideal types of single-ion magnets for research and development due to the significant magnetic anisotropy of rare earth ions. However, most of the high-performance rare-earth single-ion magnets currently developed belong to the category of metal-organic compounds, which need to be obt...

AI Technical Summary

Problems solved by technology

However, in the synthesis and preparation of rare-earth single-ion magnets, single-acylhydrazone ligands are more common, and rare-earth single-ion magnets based on diacylhydrazone ligands have not been reported in previous literature.

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