Two Windmill-Shaped Ln18 Nanoclusters Exhibiting High Magnetocaloric Effect and Luminescence

The self-assembly of the high-nuclearity Ln-exclusive nano -clusters is challenging but of significance due to its aesthetically pleasing architectures and far-reaching latent applications in magnetic cooling technologies. Herein, two novel high-nuclearity lanthanide nanoclusters were successfully synthesized under solvothermal conditions, formulated as {[Gd1 8 ( IN)2 0(HCOO)8(mu 6-O)(mu 3-OH)2 4(H2O)4]center dot 4 H2O}n and {[Eu18(IN)16(HCOO)8(CH3COO)4(mu 6-O)(mu 3-OH)24(H2O)4]center dot 5H2O}n (abbre-viated as Gd18 and Eu18, HIN = isonicotinic acid). Both of them possess novel and exquisite windmill-shaped cationic cores in the family of high-nuclearity Ln-exclusive nanoclusters. Remarkably, the adjacent second building units are interconnected into a three-dimensional (3D) metal-organic framework by IN- ligands. As expected, the abundant existence of GdIII ions endows Gd18 with a favorable magnetic entropy change at 2.0 K for Delta H = 7.0 T (-Delta Smmax = 40.0 J kg-1 K-1), and Eu18 displays the typical luminescence of EuIII ions.