Three dinuclear Dy(Ⅲ)complexes,[Dy_(2)(tfa)_(4)L_(2)](1),[Dy_(2)(TTA)_(4)L_(2)](2)and[Dy_(2)(dbm)_(4)L_(2)·2CH_(3)CN·0.5H_(2)O](3)(tfa=trifluoroacetylacetonate,TTA=2-thenoyltrifluoroacetone,dbm=dibenzoylmet...Three dinuclear Dy(Ⅲ)complexes,[Dy_(2)(tfa)_(4)L_(2)](1),[Dy_(2)(TTA)_(4)L_(2)](2)and[Dy_(2)(dbm)_(4)L_(2)·2CH_(3)CN·0.5H_(2)O](3)(tfa=trifluoroacetylacetonate,TTA=2-thenoyltrifluoroacetone,dbm=dibenzoylmethane and HL=2-[((4-bromophenyl)-imino)methyl]-8-hydroxyquinoline,have been synthesized,and structurally and magnetically characterized.The Dy(Ⅲ)ions are eight-coordinated with two bidentate β-diketonate and two μ_(2)-O bridging 8-hydroxyquinoline Schiff base ligands.Magnetic studies reveal that 1-3 exhibit different magnetic relaxation behaviors with the anisotropic barriers of 9.61 K(1),54.81 K(2)and 30.98 K(3),respectively.The different magnetic relaxation behaviors of the three Dy_(2)complexes originate from the different chemical environments of the central Dy3+ions with different β-diketonate coligands.展开更多
基金supported financially by the National Natural Science Foundation of China(no.21271137,21571138 and 21561014).
文摘Three dinuclear Dy(Ⅲ)complexes,[Dy_(2)(tfa)_(4)L_(2)](1),[Dy_(2)(TTA)_(4)L_(2)](2)and[Dy_(2)(dbm)_(4)L_(2)·2CH_(3)CN·0.5H_(2)O](3)(tfa=trifluoroacetylacetonate,TTA=2-thenoyltrifluoroacetone,dbm=dibenzoylmethane and HL=2-[((4-bromophenyl)-imino)methyl]-8-hydroxyquinoline,have been synthesized,and structurally and magnetically characterized.The Dy(Ⅲ)ions are eight-coordinated with two bidentate β-diketonate and two μ_(2)-O bridging 8-hydroxyquinoline Schiff base ligands.Magnetic studies reveal that 1-3 exhibit different magnetic relaxation behaviors with the anisotropic barriers of 9.61 K(1),54.81 K(2)and 30.98 K(3),respectively.The different magnetic relaxation behaviors of the three Dy_(2)complexes originate from the different chemical environments of the central Dy3+ions with different β-diketonate coligands.
