Abstract
Two dinuclear lanthanide(III) complexes based on 8-hydroxyquinoline Schiff base derivatives, [Ln2(hfac)6L2]·0.5C7H16 (Ln=Gd (1) and Dy (2), HL=5-(4-methylbenzylidene)-8-hydroxylquinoline and hfac=hexafluoroacetylacetonate), have been synthesized, structurally and magnetically characterized. Both 1 and 2 are phenoxo-O bridged dinuclear complexes, and center Ln(III) ions are eight-coordinated with three bidentate hfac and two μ2-O bridging 8-hydroxyquinoline Schiff base ligands. Magnetic studies reveal that 1 exhibits antiferromagnetic exchange interaction between nearby Gd(III) centers and shows magnetic refrigeration (−ΔSm=14.9Jkg−1K−1 for ΔH=7 T at 2K). Ac susceptibility measurements reveal that 2 exhibits slow magnetic relaxation behavior with the anisotropic barriers (ΔE/kB) of 3.0K.
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