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Preparation method of adjustable one-dimensional spin-crossover molecular magnetic material

A technology of spin crossing and magnetic materials, which is applied to the magnetism of organic materials/organic magnetic materials, iron-organic compounds, etc., can solve the problems of narrow application range of spin transition temperature, low spin transition temperature, and harsh reaction conditions. Achieve the effects of significant temperature changes, large differences, and simple reaction conditions for spin transitions

Pending Publication Date: 2020-12-22
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In 2005, Peng et al synthesized [Fe(Htrz) by homogeneous acid in deionized aqueous solution. 2 (trz)](BF 4 ) and its derivatives. In this process, the homogeneous acid prevents the deprotonation of Htrz and does not introduce surfactants, etc. compared with the reverse micellar method. Therefore, the prepared derivatives have high purity, but the reaction conditions Harsh, it needs to be completed under pressure under inert gas, the spin transition temperature is low, and the application area is narrow
[0006] In recent years, people's interest in spin crossing has gradually increased, mainly because spin crossing complexes have ideal molecular bistability, and these two states can be switched between low-spin and high-spin states caused by external disturbances. There is a method of adjusting the ratio of deionized water to acid to realize the transformation of the molecular structure of the spin-crossed molecular magnetic material, but the material molecules obtained by this method all contain crystal water, which affects the experimental results, and the spin transformation temperature narrow range of applications

Method used

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  • Preparation method of adjustable one-dimensional spin-crossover molecular magnetic material
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  • Preparation method of adjustable one-dimensional spin-crossover molecular magnetic material

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Effect test

Embodiment 1

[0028] A method for preparing an adjustable one-dimensional spin crossed molecular magnetic material, the steps are: after mixing the methanol solution of 1H-1,2,4-triazole and the adjustment solution of FeX for reaction and crystallization, washing and purifying with methanol, namely One-dimensional spin-crossed molecular magnetic materials were obtained;

[0029] When the adjustment solution of the FeX is the acid solution of FeX, the specific steps are as follows:

[0030] S1, under normal temperature and pressure, Fe(CF 3 SO 3 ) 2 (354 mg, 1 mmol) of CF 3 SO 3H (3 wt%, pH=5.5) aqueous solution was gradually added to 1H-1,2,4-triazole (207 mg, 3 mmol) in methanol (2ml) solution, the mixed solution was stirred at room temperature for ten minutes, and the solution was Put it in a plastic test tube and close it (the volume of the solution accounts for about one-fifth of the volume of the plastic test tube);

[0031] S2, after two months, white massive crystals were preci...

Embodiment 2

[0039] A method for preparing an adjustable one-dimensional spin crossed molecular magnetic material, the steps are: after mixing the methanol solution of 1H-1,2,4-triazole and the adjustment solution of FeX for reaction and crystallization, washing and purifying with methanol, namely One-dimensional spin-crossed molecular magnetic materials were obtained;

[0040] When the adjustment solution of the FeX is the acid solution of FeX, the specific steps are as follows:

[0041] S1, under normal temperature and pressure, Fe(BF 4 ) 2 (338 mg, 1 mmol) of CF 3 SO 3 H (3 wt%, pH=5.5) aqueous solution was gradually added to 1H-1,2,4-triazole (207 mg, 3 mmol) in methanol (2ml) solution, the mixed solution was stirred at room temperature for ten minutes, and the solution was Put it in a plastic test tube and close it (the volume of the solution accounts for about one-fifth of the volume of the plastic test tube);

[0042] S2, after two months, purple massive crystals were precipita...

Embodiment 3

[0050] A method for preparing an adjustable one-dimensional spin crossed molecular magnetic material, the steps are: after mixing the methanol solution of 1H-1,2,4-triazole and the adjustment solution of FeX for reaction and crystallization, washing and purifying with methanol, namely One-dimensional spin-crossed molecular magnetic materials were obtained;

[0051] When the adjustment solution of the FeX is the acid solution of FeX, the specific steps are as follows:

[0052] S1, under normal temperature and pressure, Fe(CF 3 SO 3 ) 2 (354 mg, 1 mmol) of CF 3 SO 3 H (5 wt%, pH=4) aqueous solution was gradually added to 1H-1,2,4-triazole (414 mg, 6 mmol) in methanol (2ml) solution, the mixed solution was stirred at room temperature for ten minutes, and the solution was Put it in a plastic test tube and close it (the volume of the solution accounts for about one-fifth of the volume of the plastic test tube);

[0053] S2, after one month, white massive crystals are precipit...

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Abstract

The invention discloses a preparation method of an adjustable one-dimensional spin-crossover molecular magnetic material, which is characterized by comprising the following steps of mixing a methanolsolution of 1H-1, 2, 4-triazole and an FeX regulating solution, reacting, crystallizing, washing with methanol, and drying to obtain the one-dimensional spin-crossover molecular magnetic material. When the FeX regulating solution is an acid solution of FeX, the molecular formula of the one-dimensional spin-crossover molecular magnetic material is C6H9FeN9Xm, the chemical formula is [Fe(Htrz)3]Xm.nH2O, and when the FeX regulating solution is a neutral alcohol solution of FeX, the molecular formula of the one-dimensional spin-crossover molecular magnetic material is C6H8FeN9Xk, thechemical formula is[Fe(Htrz)2(trz)]Xk,trz stands for 1,2,4-triazole, Htrz stands for 1H-1,2,4-triazole, and X stands for one of CF3SO3 and BF4, n, m and k are all natural numbers, the ligand structure of the one-dimensional spin-crossover molecular magnetic material molecule is changed by adjusting the acid or alcohol environment at normal temperature and normal pressure, and the application range of the spin transition temperature of the one-dimensional spin-crossover molecular magnetic material is expanded.

Description

technical field [0001] The invention relates to the technical field of synthesis of spin-crossed magnetic materials in molecular magnetic materials, in particular to a preparation method of an adjustable one-dimensional spin-crossed molecular magnetic material. Background technique [0002] In the last two or three decades, molecular magnetic materials have received extensive attention. Molecular magnetism is a behavior exhibited by paramagnetic centers with unpaired electrons in a coordination chemical environment through isolation or synergy. Complexes composed of metal ions and organic ligands are one of the main types of molecular magnetic materials. This type of complexes has both the properties of inorganic compounds of metal ions and the properties of organic compounds caused by organic ligands. The final physical properties of the complexes can be tuned through the choice of metal ions and ligands, and even in some cases, different physical properties can be combine...

Claims

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Application Information

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IPC IPC(8): C07F15/02H01F1/42
CPCC07F15/02H01F1/42
Inventor 石胜伟贺琦祺张欢江梦云桂子欣徐金新杨克聪覃鑫
Owner WUHAN INSTITUTE OF TECHNOLOGY
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