Four coordination polymers ∞2[Ni(DMF)(L)Ln(bdc)1.5] (Ln = La (1) and Nd (4)) and ∞2[Ni2(DMF)2(L)2Ln2(bdc)3]·CH3OH (Ln = Ce (2) and Pr (3)) were derived from a symmetrical salamo-based ligand (H2L) with Ni(OAc)2·4H2O, Ln(NO3)3·6H2O (Ln = La, Ce, Pr and Nd), and H2bdc (terephthalic acid). Coordination polymers 1–4 were synthesized and characterized by elemental analyses, X-ray single crystal diffraction, infrared spectroscopy and ultraviolet–visible absorption spectroscopy. Coordination polymers 1–4 have similar structures exhibiting two-dimensional coordination polymers with brick wall in which [Ni(DMF)(L)Ln] units were linked by exodentate (bdc)2− linker. In each unit, Ni(II) atoms adopted a slightly distorted octahedral geometry, the Ln(III) atoms were nine-coordinated, and the coordination polyhedron was a distorted tricapped trigonal prism. The crystal structure and supramolecular features were discussed in detail. At the same time, the fluorescent properties of coordination polymers 1–4 were also investigated.

中文翻译：

---

一系列衍生自 3-EtOsalamo 和二羧酸盐的异质双金属 Ni(II)–Ln(III)（Ln = La、Ce、Pr ​​和 Nd）配位聚合物：合成、晶体结构和荧光特性

四种配位聚合物∞2[Ni(DMF)(L)Ln(bdc)1.5] (Ln = La (1) and Nd (4)) 和∞2[Ni2(DMF)2(L)2Ln2(bdc)3] ·CH3OH (Ln = Ce (2) 和 Pr (3)) 衍生自对称的萨拉莫基配体 (H2L) 与 Ni(OAc)2·4H2O, Ln(NO3)3·6H2O (Ln = La, Ce, Pr 和 Nd）和 H2bdc（对苯二甲酸）。配位聚合物 1-4 被合成并通过元素分析、X 射线单晶衍射、红外光谱和紫外-可见吸收光谱表征。配位聚合物 1-4 具有类似的结构，显示出二维配位聚合物与砖墙，其中 [Ni(DMF)(L)Ln] 单元通过外齿 (bdc)2- 连接器连接。在每个单元中，Ni(II)原子采用略微扭曲的八面体几何结构，Ln(III)原子采用九配位，配位多面体为扭曲的三棱柱。详细讨论了晶体结构和超分子特征。同时，还研究了配位聚合物 1-4 的荧光性质。