Synthesis, Characterization, Magnetic Properties, and Topological Aspects of Isoskeletal Heterometallic Hexanuclear Co(4)(II)Ln(2)(III) Coordination Clusters Possessing 2,3,4M6-1 Topology

摘要

The reaction of (E)-2-(2-hydroxy-3-methoxybenzylid-eneamino)phenol (H(2)L1) with Co(NO3)(2) 6H(2)O and LnCl(3) x(H2O) afforded a family of hexanuclear heterometallic coordination clusters (CCs) formulated as [Co(4)(II)Ln(2)(III)(mu(3)-OH)(2)(L1)(4)Cl-2(NO3)(2)(MeOH)(4)] 3(Et2O) where Ln is Y (1), Gd (2), Dy (3), and Tb (4). All the compounds are stable in solution as confirmed by ESI-MS studies. The compounds can be described as twisted boat-like and possess a 2,3,4M6-1 topology. The reaction of (E)-2-(5-bromo-2-hydroxy-3-methoxybenzylideneamino)phenol (H2L2) with Co(NO3)(2) 6H(2)O and DyCl3 x(H2O) afforded [(Co4Dy2III)-Dy-II(mu 3-OH)(2)(L2)(4)Cl-2(NO3)(2)(MeOH)(4)] (5), which is isoskeletal to compounds 1-4. Magnetic studies performed over the temperature range 1.8-300 K show that compound 3 undergoes slow magnetic relaxation.