Heptanuclear Disk-Like M^II3Ln^III4 (M = Ni, Co) Coordination Clusters: Synthesis, Structures and Magnetic Properties

The synthesis, characterization, crystal structures and magnetic properties of isoskeletal heptanuclear disk-like MLn coordination clusters with the general formula [CoLn(µ-OH)L(CFSO)][(CFSO)] where Ln = Gd (2), Y (3) and [NiLn(µ-OH)L(CFSO)][(CFSO)] where Ln = Dy (4), Gd (5), Y (6) are presented. All the compounds are stable in solution as confirmed by ESI-MS. Magnetic studies were performed for compounds 2, 4, 5 and 6 and indicate ferromagnetic coupling while the magnetocaloric properties of 5 are characterized by ?S = -15.4 J kg K at T = 5.0 K and ?T = 5.9 K at T = 2.3 K, for µ?H = 7 T.