Abstract [2 × 2] grids of general formula [Ln4L4Cl4(DMF)4].2H2O (Ln = Sm (1), Eu (2), Tb (3); H2L = (E)-N’-((E)-(hydroxyimino)butan-2ylidene)salicylolhidrazide; DMF = dimethylformamide) were successfully constructed using a lanthanide ion as corners and L2-, a Schiff base, as linkers. The single crystal X-ray diffraction study reveals that compounds 1 and 3 are neutral tetranuclear complexes. They feature a [2 × 2] grid distorted skeleton. Coordination sphere of Ln ions are completed by one chloro ligand and a solvent molecule. The grids were obtained after a careful study of the chemical speciation of these systems performed by potentiometric titrations (25.0 °C in 40:60 DMF:water mixture, I = 0.50 mol L-1 NMe4Cl).

中文翻译：

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由镧系离子和席夫碱构成的新型 [2 x 2] 网格的设计和自组装

摘要 [2 × 2] 格的通式 [Ln4L4Cl4(DMF)4].2H2O (Ln = Sm (1), Eu (2), Tb (3); H2L = (E)-N'-((E) -（羟基亚氨基）丁烷-2亚基）水杨酰肼；DMF = 二甲基甲酰胺）使用镧系离子作为角和 L2-，席夫碱，作为连接器成功构建。单晶 X 射线衍射研究表明化合物 1 和 3 是中性四核配合物。它们具有 [2 × 2] 网格扭曲骨架。Ln 离子的配位球由一个氯配体和一个溶剂分子完成。在通过电位滴定（25.0 °C 在 40:60 DMF:water 混合物中，I = 0.50 mol L-1 NMe4Cl）对这些系统的化学形态进行仔细研究后，获得了网格。