Abstract
Three new phenoxo-O-bridged dinuclear lanthanide(III) compounds, [Dy(bfa)2L1]2 (1), [Gd(hfac)3L2]2·C6H14 (2) and [Tb(hfac)3L2]2 (3) (bfa = benzoyltrifluoroacetone, hfac = hexafluoroacetylacetonate, HL1 = 2-[(3,4-dimethylaniline)-imino]methyl]−8-hydroxyquinoline and HL2 = 5-(2-thenylidene)-8-hydroxylquinoline), have been synthesized, then structurally and magnetically characterized. The X-ray structural analysis shows that 1–3 are phenoxo-O-bridged dinuclear compounds and the central eight-coordinated Ln(III) ions are in a slightly distorted dodecahedral geometry. Magnetic measurements indicated that slow magnetic relaxation behaviors were observed in 1 with an energy barrier (ΔE/kB) of 52.21 K and τ0 = 1.75 × 10−7 s; compound 2, however, exhibited magnetic refrigeration with −ΔSm = 15.06 J kg−1 K−1 for ΔH = 7.0 T at 2.0 K.
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