Two Dy4 complexes based on a Schiff base ligand and two benzoates:Synthesis,structures,and single-molecule magnetic properties
Two Dy4 clusters with the formulae[Dy4(L)4(PhCO2)2(NO3)2(EtOH)2](1)and[Dy4(L)4(2-NO2-PhCO2)2(NO3)2(EtOH)2](2)were obtained by the reactions of Dy(NO3)3-6H2O with a Schiff base ligand 2-(((2-hydroxy-3-methoxy-benzyl)imino)methyl)-4-methoxyphenol(H2L)and two auxiliary ligands PhCO2H and 2-NO2-PhCO2H in ethanol.Single crystal X-ray diffraction studies evidenced that the two complexes are constructed from Dy2 units,and display a centrosymmetric tetranuclear linear chain structure.One metal center in the Dy2 unit in 1 and 2 presents a seven-coordinated geometry,and the other Dy(Ⅲ)ion displays an eight-coordinated geometry.Both complexes are identified as single-molecule magnets with energy barriers of 110 and 108 K,respectively.Theoretical calculations also ana-lyzed the magnetic properties of 1 and 2.CCDC:2047006,1;2047008,2.
Schiff basesingle-molecule magnetstetranuclearcomplete-active-space self-consistent field
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