Two series of novel coordination polymers (CPs), namely, Ln₃(3,5-DCB)₉(bipy) (H₂O)₂·(bipy) [Ln = Nd (1), Sm (2)] and Ln₂(3,5-DCB)₆(bipy)H₂O [Ln = Eu (3), Gd (4), Tb (5) and Dy (6)], have been synthesized by hydrothermal reaction of a bridging ligand, 3,5-dichlorobenzoic acid (3,5-HDCB), with LnCl₃·nH₂O and N-donor neutral ligand, 2,2′-bipyridine (bipy). Single-crystal x-ray diffraction, elemental analysis, IR spectroscopy, thermogravimetric analysis (TGA), and powder x-ray diffraction (PXRD) for 1–6 are presented. CPs 1 and 2 exhibit trinuclear lanthanide architectures, in which the center Ln(III) are seven-coordinated and eight-coordinated adopting monocapped triangular prismatic, distorted square antiprism and bicapped trigonal prismatic coordination geometry, respectively, whereas CPs 3–6 are isostructural dinuclear structures. The center Ln(III) ions are also seven-coordinated and eight-coordinated with different coordinate modes adopting distorted monocapped triangular prismatic and square antiprism coordination geometry. Trinuclear CPs 1 and 2 are packed together via hydrogen-bonding interaction to form the two-dimensional (2D) supramolecular layers. CPs 3–6 exhibit 2D layers by the π–π interaction. CPs 2, 3, 5, and 6 display the characteristic fluorescent emissions of Sm(III), Eu(III), Tb(III), and Dy(III), respectively. CPs 1 and 4–6 exhibit corresponding weak anti-ferromagnetic and ferromagnetic interactions of Nd(III), Gd(III), Tb(III), and Dy(III) in the low-temperature range.

中文翻译：

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以3,5-二氯苯甲酸酯为主的一维镧系配位聚合物的结构、光致发光和磁性

两个系列的新型配位聚合物(CPs)，即Ln ₃ (3,5-DCB) ₉ (bipy) (H ₂ O) ₂ ·(bipy) [Ln = Nd ( 1 ), Sm ( 2 )]和Ln ₂ (3,5-DCB) ₆ (bipy)H ₂ O [Ln = Eu ( 3 ), Gd ( 4 ), Tb ( 5 ) 和 Dy ( 6 ) ]，通过桥连配体的水热反应合成， 3,5-二氯苯甲酸(3,5-HDCB)，具有LnCl ₃ · n H ₂ O和N-供体中性配体，2,2'-联吡啶(bipy)。介绍了1 – 6的单晶 X 射线衍射、元素分析、红外光谱、热重分析 (TGA) 和粉末 X 射线衍射 (PXRD) 。CP 1和2呈现三核镧系元素结构，其中中心Ln(III)分别为七配位和八配位，采用单帽三角柱、扭曲正方反棱镜和双帽三角棱柱配位几何形状，而CP 3 – 6是同构双核结构。中心Ln(III)离子也是七配位和八配位的，具有不同的坐标模式，采用扭曲的单帽三角棱柱和正方反棱柱配位几何结构。三核 CP 1和2通过氢键相互作用堆积在一起，形成二维 (2D) 超分子层。CP 3 – 6通过 π-π 相互作用呈现出二维层。CP 2、3、5和6分别显示Sm( III )、Eu(III) 、 Tb(III)和Dy(III )的特征荧光发射。CPs 1和4-6在低温范围内表现出相应的Nd(III)、Gd(III)、Tb(III)和Dy(III)的弱反铁磁和铁磁相互作用。