Method for preparing metal crown ether single-molecular magnets

Abstract

The invention discloses a method for preparing metal crown ether single-molecular magnets, and relates to a method for preparing single-molecular magnets. The invention aims to solve the problem of alow yield of a method for synthesizing metal crown ether rare earth complex single-molecular magnets in the prior art. The preparation method comprises the steps: dissolving salicyl hydroxamic acid, dysprosium nitrate and gallium nitrate in methanol so as to obtain a solution A, adding pyrazine to the solution A, performing stirring for a reaction so as to obtain a solution B, then adding pyridine, performing stirring at room temperature so as to obtain a preform, volatilizing the solvent of the preform so as to obtain the metal crown ether single-molecular magnets {Dy<3+>[Ga(III)MCshi]}. Themethod has the advantages that (1) the metal crown ether single-molecular magnets are single-molecular magnets with good antiferromagnetism, and (2) the preparation method is simple, and has high repeatability and a high yield which can reach 50% or above. The method is mainly applied to preparation of the metal crown ether single-molecular magnets {Dy<3+>[Ga(III)MCshi]}.

Description

technical field

[0001] The invention relates to a preparation method of a single-molecule magnet. Background technique

[0002] Single-molecular magnets (Single–Molecular Magnets, SMMs) are new materials between molecular-based magnets and nanomagnetic materials; they refer to those single molecules that can be magnetized under a magnetic field and can still maintain magnetism when the magnetic field is removed. Hysteresis loops appear on the curve of the magnetization against the external magnetic field. The first single-molecule magnet [Mn 12 o 12 (OCMe) 16 (H 2 O) 4 ] The discovery of clusters opened up a new field of magnetism. With the deepening of the research, the researchers found that these single-molecule magnets exhibit the temperature of the magnetic relaxation effect (blocking temperature T B ) is generally low, which greatly limits its application. Therefore, researchers expect to increase the blocking temperature by synthesizing other types of single-m...

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