Abstract
A series of new tetranuclear lanthanide metal complexes of [Ln4(μ4-O2−)(HL)2(L)2]·0.5(H2NCH2CHOHCH2NH2)·(CH3CN)·1.25(H2O) (Ln = Tb(1)), [Ln4(μ4-O2−)(HL)2(L)2]·0.5(H2NCH2CHOHCH2NH2)·0.5(CH3CN)·0.25(H2O) (Ln = Dy(2) or Ho(3)), were elaborately synthesized using a Schiff base ligand, 1,3-bis(5-bromosalicylideneamino)-2-propanol) (H3L). They were structurally and magnetically characterized. The crystallographic data reveal the tetranuclear lanthanide core of complexes 1–3 bridged by one μ4-O2− ion. Complexes 1–3 contained one unusual Ln4 boat-shaped unit, forming a novel Ln4 cluster. Detailed static and dynamic magnetic analysis of complexes 1–3 revealed single-molecule magnet (SMM) behavior with anisotropy barrier of Ueff = 20.98 K and Ueff = 43.47 K and two pre-exponential factors τ0 = 7.66 × 10−7 s and τ0 = 9.75 × 10−7 s for complex 2.
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