Abstract:  

A layered coordination polymer, [Ce(L)(H₂O)₄]_n (1), was synthesized by hydrothermal method by the reaction of 5⁃sulfoisophthalic acid monosodium salt (NaH₂L) with cerium nitrate hexahydrate. Its molecular structure and composition were measured by single crystal diffraction, elemental analysis and thermogravimetry. Each Ce³⁺ was nine coordinated with the coordination geometry of three⁃capped triangular prism. The central Ce³⁺ could be bridged by the carboxylate and sulfonate groups of the L^3- ligands, forming a two⁃dimensional layered structure. The interlayers were connected by the hydrogen bonds between the coordination water molecules and oxygen atoms of functional groups, increasing the stability of the structure. The fluorescence measurement results show that compound 1 exhibits the characteristic fluorescence emission peak of the ligand at 427 nm. It also has the second⁃order nonlinear optical property, and its intensity is 0.7 times of that of potassium dihydrogen phosphate (KDP).

Key words: Coordination polymer, Crystal structure, Aromatic ligand, Layered structure

摘要：

通过水热合成的方法，采用多官能团配体间苯二甲酸⁃5⁃磺酸钠（NaH₂L）和Ce(NO₃)₃·6H₂O反应得到层状的配位聚合物[Ce(L)(H₂O)₄]_n（1）。采用单晶衍射、元素分析和热重分析测试其分子结构和组成。Ce³⁺是九配位，呈三帽三角棱柱构型。L^3-配体利用羧基和磺酸基桥连中心金属Ce³⁺，构成了二维层状结构，层间通过配位水分子与官能团氧原子之间的氢键连接，提高了结构的稳定性。荧光测试结果表明，化合物1在427 nm显示出配体的特征荧光发射峰，其还具有二阶非线性光学性质，强度是磷酸二氢钾（KDP）的0.7倍。

关键词: 配位聚合物, 晶体结构, 芳香配体, 层状结构