Structures, luminescence properties and single-molecule magnet behavior of four dinuclear lanthanide compounds

Abstract Four new dinuclear lanthanide(Ⅲ) compounds, namely [Ln2(dbm)4L2(CH3OH)2]·2CH3OH (LnⅢ = Sm(1) and Dy(4), Hdbm = 1,3-diphenylpropane-1,3-dione, H2L = N'-[(1E)-[5-(hydroxymethyl)furan-2-yl]methylidene]pyrazine-2-carbohydrazide), [Eu2(dbm)4L2](2) and [Tb2(dbm)4L2] ·CH3OH (3)), have been synthesized, and structurally and magnetically characterized. The Eu3+ ion is eight coordinated with two bidentate β-diketonate and two μ2-O bridging multidentate ligands. The Dy3+ ion is nine coordinated with two bidentate β-diketonate, one methanol molecule, and two μ2-O bridging multidentate ligands. Magnetic measurements indicated that slow magnetic relaxation behaviors were observed the dilution in cognate Y(Ⅲ) matrix of compound 4, with energy barrier (ΔE/kB) of 47.21 K under dc field of 2000 Oe and τ0 of 1.21 × 10−10 s. Additionally, solid-state luminescence properties reveal that 2-4 display the characteristic LnⅢ luminescence at room temperature.