Two isostructural tetranuclear lanthanide clusters named [Ln₄(L)₄(CH₃O)₄]·CH₃OH (Ln = Gd(III) for 1, Dy(III) for 2, H₂L = N′-(2-hydroxy-3-methoxybenzylidene)-6-(hydroxymethyl) picolinohydrazide) were successfully isolated by using a polydentate Schiff based ligand and Ln(III) nitrate salts. The structures of 1 and 2 were characterized by X-ray structural analyses, they are held by four double deprotonated ligands L²⁻. In them all the lanthanide ions are eight-coordinated and distributed over four vertices of a parallelogram, presenting a Ln₄ cluster with a strict [2 × 2] square grid pattern. The details of magnetic analysis show that 1 displays weak anti-ferromagnetic exchange between neighboring Gd(III) ions through carboxylate oxygen and methanol oxygen ligand atoms. Furthermore, 1 exhibits significant magnetocaloric effect with the maximum entropy change –ΔS_m value of 28.5 J/(kg·K) for ΔH = 7.0 T at 2.0 K. For compound 2, remarkable slow magnetic relaxation behaviors are observed in the presence of zero magnetic field with τ₀ = 1.02 × 10⁻⁶ s and energy barrier ΔE/k_B = 43.24 K.

两个同构四核镧系元素簇命名为 [Ln ₄ (L) ₄ (CH ₃ O) ₄ ]·CH ₃ OH (Ln = Gd(III) for 1 , Dy(III) for 2 , H ₂ L = N '-(2 -羟基-3-甲氧基亚苄基）-6-（羟甲基）吡啶甲酰肼）通过使用多齿席夫基配体和硝酸Ln（III）盐成功分离。1和2的结构通过 X 射线结构分析表征，它们由四个双去质子化配体 L ^{2− 保持}. 在它们中，所有镧系元素离子都是八配位的，分布在平行四边形的四个顶点上，呈现出具有严格 [2 × 2] 方格图案的 Ln ₄簇。磁性分析的细节表明，1通过羧酸盐氧和甲醇氧配体原子在相邻的 Gd(III) 离子之间显示出弱的反铁磁交换。此外，1表现出显着的磁热效应，最大熵变化 -Δ S _m值为 28.5 J/(kg·K) Δ H  = 7.0 T 在 2.0 K。对于化合物2，在存在下观察到显着的慢磁弛豫行为τ ₀  = 1.02 × 10的零磁场⁻⁶  s 和能垒 Δ E / k _B  = 43.24 K。