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 inf

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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