A [Dy2] Complex with Single-Molecule Magnet Behavior and its Analogues Based on Transformed Ligand Induced by Methanol in Coordination Process

This article discloses a method for altering Schiff base to ester in the generative process of binuclear Ln-complexes with Ueff of 61.7 k at zero dc field for Dy-complex. In this article, three [Ln2] complexes, [Ln2(dbm)4(L′)2] (Ln = Tb (1), Dy(2), Ho(3)), were reported. Static and dynamic magnetic analysis of complexes 1–3 revealed that complex 2 possessed effective energy barrier of 61.7 K at zero dc field, suggesting single-molecule magnet (SMM) behavior. Besides, the coordinated ligand HL′ in the three complexes (HL′ = methyl-8-hydroxyquinoline-2-carboxylate) was not original but transformed from Schiff-base HL (HL = 2-[[(1,2,4-triazole)-4-imino]methyl]-8-hydroxy-quinoline) during the coordination process. As the best knowledge of us, this kind of ligand-exchange is rare in organic chemistry and in coordination chemistry.