Magnetic Refrigeration Property And Slow Magnetic Relaxation Behavior Of Five Dinuclear Ln(Iii)-Based Compounds

In this work, a series of dinuclear Ln(III)-based compounds with the molecular form [Ln(2)(L)(2)(dbm)(2)(H2O)(2)]center dot nCH(3)OH (Ln(III) = Eu (1), Gd (2), Tb (3), Dy (4) and Ho (5), Hdbm = 1,3-diphenyl-1,3-propanedione and H2L = 2-[(1E)-{[(pyridin-2-yl)formamido]imino}methyl]benzoic acid) have been successfully synthesized using a polydentate Schiff base ligand (H2L) and reacting it with the beta-diketone salts Ln(dbm)(3)center dot 2H(2)O. The crystal structures and magnetic properties of the five Ln(2) compounds have been completely studied. The crystal structure studies reveal that compounds 1-5 are isostructural and show a dinuclear structure with a parallelogram Ln(2)O(2) core. The magnetic research suggests that the Gd-2 compound shows a cryogenic magnetic refrigeration property with magnetic entropy (-Delta S-m) = 23.2 J K-1 kg(-1) (T = 2.0 K and Delta H = 7.0 T), while the Dy-2 compound exhibits slow magnetic relaxation behavior. (C) 2020 Elsevier Ltd. All rights reserved.