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Cobalt-based single-molecular magnet synthesizing method

A technology of molecular magnets and synthesis methods, which is applied in the manufacture of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of inconvenient control and synthesis, poor repetition effect, and insufficient dosage.

Active Publication Date: 2015-11-18
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The controlled synthesis of cobalt cluster compounds is a challenge in itself. When cobalt-based cluster compounds are synthesized by the solution method, it is often difficult to control the synthesis due to the influence of external temperature, air flow and other conditions, and the repeatability is poor, so that often only Get a few test single crystal structures, even the amount used for basic test properties is not enough

Method used

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  • Cobalt-based single-molecular magnet synthesizing method
  • Cobalt-based single-molecular magnet synthesizing method
  • Cobalt-based single-molecular magnet synthesizing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) 8mL containing Co(NO 3 ) 2 ·6H 2 O1mmol, NaN 3 0.5mmol and 2-hydroxymethylbenzimidazole 0.5mmol of anhydrous methanol solution, stirred with a magnetic stirrer in air for 5 minutes;

[0020] (2) The reactant solution is transferred to a hydrothermal reaction kettle (15 milliliters in volume) with a polytetrafluoroethylene substrate, and after adjusting the pH to 6 with triethylamine, it is airtight, and the direct heating container makes the reactant solution to 140° C. Hold for 72 hours, then cool at room temperature;

[0021] (3) The reacted solution was filtered and washed with anhydrous methanol to obtain red hexagonal prism-shaped crystals (2×1×1.5 mm).

Embodiment 2

[0023] (1) 8mL containing Co(NO 3 ) 2 ·6H 2 O1mmol, NaN 3 0.5mmol and 2-hydroxymethylbenzimidazole 0.5mmol of anhydrous methanol solution, stirred with a magnetic stirrer in air for 5 minutes;

[0024] (2) Transfer the reactant solution to a digestion tank (capacity 60mL) with a polytetrafluoroethylene substrate, adjust the pH to 6 with triethylamine, seal it, and heat it in a microwave oven (Power=300w, P=3.2atm ) to 100°C and hold for 1min, then heated to 120°C and hold for 10min, then cooled at room temperature;

[0025] (3) Filter the reacted solution and wash it with anhydrous methanol to obtain a red hexagonal prism-shaped crystal with the same shape as in Example 1

[0026] After detection and identification, the molecular formula of the cobalt-based single-molecule magnet obtained in Examples 1 and 2 is [Co 12 (L) 15 (N 3 ) 7 ](NO 3 ) 2 2(CH 3 OH)·2(H 2 O), belonging to the R-3 space group, wherein L is a 2-hydroxymethylbenzimidazole ligand, and the unit ce...

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Abstract

The invention discloses a cobalt-based single-molecular magnet synthesizing method. Cobalt salt and 2-hydroxybenzimidazole ligand are adopted with participation of azides ions, and a cobalt-based single-molecular magnet is prepared under the solvothermal system or a microwave reaction condition. It is indicated by experiments that the process is safe and simple, the cost of raw materials is low, the defect that the reproducibility of a common solution method is poor is overcome, the obtained single-molecular magnet of the [Co12(L)15(N3)7](NO3)2.2(CH3OH).2(H2O) (L is the 2-hydroxybenzimidazole ligand ) is red hexagonal-prism-shaped crystal, the purity is high, the crystal size is large and can be controlled within 2*1*1.5 mm, and the yield is high and reaches over 50%.

Description

technical field [0001] The invention relates to the field of single-molecule magnet preparation, in particular to a method for synthesizing a cobalt-based single-molecule magnet. Background technique [0002] A single-molecule magnet is actually a molecular magnet of nanometer size in the true sense. It is a kind of aggregate of molecules with the same chemical structure. It is usually arranged in a crystal lattice in the form of crystals. Because the magnetic exchange between molecules is very weak , so weak that generally there may only be dipole-dipole interaction (dipole-dipole interaction), so it is considered that the macroscopic magnetic behavior is the magnetic behavior exhibited only by a single molecule. To obtain compounds with the behavior of "single-molecule magnets", they must meet the following two conditions in terms of magnetism: first, they have a large spin ground state; second, the molecules have obvious negative anisotropy, that is, the magnetic properti...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/053
Inventor 周艳玲刘先荣王强心
Owner GUANGXI UNIV
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