Abstract
The 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 DyIII atoms in 1 are doubly bridged by the two phenolato oxygen atoms of HL− ligands, however, the DyIII atoms are bridged by additional two deprotonated μ1,3-phosphate anions in 2. Each of the two lanthanide ions is eight-coordinated and is located in the different symmetry with triangular dodecahedron (D2d) for DyIII in 1 and elongated triangular bipyramid (D3h) for DyIII in 2. Dc magnetic susceptibility studies in the 2–300 K range reveal the weak antiferromagnetic interaction for 1 and 2. Both of them showed field-induced slow magnetic relaxation behavior with the Ueff for 1 of 46.0 K higher than 36.8 K for 2.
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