Synthesis, structure and single-molecule magnet characterization of Dy 2 dinuclear complexes with an 8–hydroxyquinoline carbohydrazone ligand

摘要

AbstractThe employment of an 8-hydroxyquinoline carbohydrazone tetradentate ligand, 8-hydroxyquinoline-2-carboxaldehyde-(benzoyl)hydrazone (H2L), DyCl3·6H2O and Et3N has led to the formation of dinuclear Dy(III) complex [Dy2(HL)2Cl4(CH3OH)2], (1) and [Dy2(HL)2((PhO)2PO2)4]·2(CH3OH) (2) in the presence of excess amount of bridging diphenyl phosphate anion, (PhO)2PO2?. X-ray crystallography data revealed that two DyIIIatoms in1are doubly bridged by the two phenolato oxygen atoms of HL?ligands, however, the DyIIIatoms are bridged by additional two deprotonatedμ1,3-phosphate anions in2. Each of the two lanthanide ions is eight-coordinated and is located in the different symmetry with triangular dodecahedron (D2d) for DyIIIin1and elongated triangular bipyramid (D3h) for DyIIIin2. Dc magnetic susceptibility studies in the 2–300 K range reveal the weak antiferromagnetic interaction for1and2. Both of them showed field-induced slow magnetic relaxation behavior with the Uefffor1of 46.0 K higher than 36.8 K for2.Graphical abstractThe carbohydrazone tetradentate ligand was emplyed for the assembly of coordination anion controllable Dy(III)-based SMM.Display OmittedHighlight?8-Hydroxyquinoline carbohydrazone were prepared for dinuclear Dy(III) single molecule magnet.?Coordination anion controlled dinuclear Dy(III) compounds were obtained.?Dinuclear Dy(III) compounds showed the anion-dependent SMM property.]]>