Abstract
Three dinuclear rare-earth complexes, [RE2(tfa)4L2] (RE=Y(1), Tb (2)) and [Tb2(dbm)4L2·CH3CN·CH2Cl2](3) (tfa=trifluoroacetylacetonate, dbm=dibenzoylmethane and HL=2-[(4-bromophenyl)-imino]methyl]-8-hydroxyquinoline), have been synthesized and structurally characterized. Complexes 1–3 are phenoxo-O bridged dinuclear complexes, RE(III) ions are eight-coordinated with two bidentate β-diketonate and two μ2-O bridging 8-hydroxyquinoline Schiff base ligands. Magnetic studies reveal that 2 shows single-molecule-magnet behavior with the anisotropic barriers (ΔE/kB) of 1.18K, while no out of-phase alternating-current (ac) signal is noticed for 3. The distinct magnetic behaviors of 2 and 3 are mainly due to the slightly different chemical environment around the center Tb(III) ions.
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