High nuclear gadolinium cluster complex with large magnetocaloric effect and preparation method thereof

A technology of magnetocaloric effect and complexes, applied to the magnetism of organic materials/organic magnetic materials, compounds containing elements of group 3/13 of the periodic table, chemical instruments and methods, etc., can solve problems such as high magnetic entropy change, and achieve Large magnetocaloric effect, conducive to large-scale production, and the effect of huge potential application value

Inactive Publication Date: 2013-03-13
NANKAI UNIV
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Problems solved by technology

Due to the great challenge in the synthesis of high-nuclear gadolinium clusters and the difficulty in obtaining h...

Method used

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  • High nuclear gadolinium cluster complex with large magnetocaloric effect and preparation method thereof
  • High nuclear gadolinium cluster complex with large magnetocaloric effect and preparation method thereof

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Embodiment

[0014] 0.5 mmol Gd 2 o 3 , 2 mmoles of thiophene-3-carboxylic acid and 10 milliliters of water were put into 25 milliliters of stainless steel reactors with polytetrafluoroethylene linings, reacted for 72 hours at 160° C., cooled to 20° C. to obtain massive crystals, collected The crystals were washed with water and ethanol in turn, and the target product was obtained after vacuum drying.

[0015] To characterize the product:

[0016] 1) Use the Quantum Design MPMS-7SQUID magnetometer to test the magnetic data of the obtained complexes, figure 2 is the ΔS calculated from the magnetization data of the high-nuclear gadolinium cluster complex at different temperatures and field strengths drawn using Origin software m Value, shown in the figure: at T=2K, ΔH=7T, -ΔS m =31.22J kg -1 K -1 , indicating that the complex is one of the few -ΔS m >30J kg -1 K -1 complexes.

[0017] 2) The selected size is (0.20×0.20×0.20) mm 3 The crystals were used for single crystal structur...

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Abstract

The invention relates to a high nuclear gadolinium cluster complex with a large magnetocaloric effect. The chemical formula is C110H82Gd10O56S22 which belongs to the triclinic system, and the space group is P-1. The preparation method comprises the steps of: placing gadolinium oxide, thiophene-3-carboxylic acid and water into a stainless steel reaction kettle and mixing uniformly; then, reacting for 72 hours at 150-170 DEG G; cooling to 20 DEG C to obtain block crystals; collecting the crystals and washing the crystals with water and ethanol; and vacuum drying to obtain the target product: high nuclear gadolinium cluster complex. The invention has the advantages that according to the preparation method based on large self-rotating ground state of gadolinium ions, weaker magnetic interaction among metals and larger metal ligand proportion, the high nuclear gadolinium cluster complex with the large magnetocaloric effect is prepared; the raw materials are simple and cheap to the benefit of large-scale production; and the complex has the large magnetocaloric effect, and has a huge potential application value in the aspect of magnetic refrigeration.

Description

technical field [0001] The invention relates to the preparation of magnetic refrigeration materials, in particular to a high-nuclear gadolinium cluster complex with large magnetocaloric effect and a preparation method thereof. technical background [0002] As a possible replacement for the expensive and increasingly rare ultra-low temperature refrigerant He 3 , Magnetic refrigeration based on the magnetocaloric effect (Magnetocaloric Effect) has attracted extensive attention from researchers as an energy-saving and environment-friendly technology. In recent years, due to its tailorability and controllability, molecular-based refrigerants have attracted great interest from chemical researchers, see: M.Manoli, R.D.L. Johnstone, S.Parsons, M.Murrie, M.Affronte, M.Evangelisti , E.K.Brechin, Angew.Chem.Int.Ed., 2007, 46, 4456; M.Evangelisti, F. Luis, L.J.de Jongh, M.Affronte, J.Mater.Chem., 2006, 1 6, 2534. [0003] Most of the reported molecular-based refrigerants are 3d-Gd / lo...

Claims

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Application Information

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IPC IPC(8): C07F5/00H01F1/42
Inventor 卜显和刘遂军赵炯鹏韩松德
Owner NANKAI UNIV
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