Abstract
In this context, three isomorphic compounds were obtained, namely, [Ln2(L)2(NO3)4(H2O)2]·2CH3OH (Ln=Dy (1), Tb (2) and Er (3), HL=N′-(2-Hydroxybenzoyl) pyridine-2-carbohydrazonamide). In these compounds, LnIII ion locates in N2O7 coordination environment, forming a monocapped square antiprism configuration (C4v). Furthermore, two L− ligands coordinate to two LnIII centers in an antiparallel or “head-to-tail” fashion with tridentate unit and monodentate phenol-O−, resulting in a center of symmetry with LnIII⋯LnIII distances (intramolecular) of 6.751Å for 1, 6.708Å for 2 and 6.723Å for 3, respectively. Magnetic measurement reveals that 1 shows frequency-dependent out-of-phase (χ″) signals under a direct-current (dc) field, exhibiting single-molecule magnet (SMM) behavior with the anisotropy energy barrier (Ueff) of 16.0K and the pre-exponential factor value (τ0) of 1.0×10−6s. In addition, the luminescence properties of 1 and 2 were studied. Moreover, the semiconductor behaviors of 1–3 have been investigated by experimental measurements of UV−vis spectroscopy.
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