High nuclear gadolinium cluster complex with large magnetocaloric effect and preparation method thereof
A technology of magnetocaloric effect and complexes, which is applied to the magnetic properties of organic materials/organic magnetic materials, compounds containing Group 3/13 elements of the periodic table, chemical instruments and methods, etc., can solve the problems of high magnetic entropy change, etc. Large magnetocaloric effect, beneficial to large-scale production, simple and cheap raw materials
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[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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