稀土(铕,钕)⁃2,6⁃吡啶二甲酸配合物的合成、结构及其性质

Synthesis, Structures and Properties of Rare Earth (Eu, Nd) Complexes with Pyridine⁃2,6⁃Dicarboxylic Acid

宋翰林 吕雪川 张晓帆 张雅琦 李成龙 高肖汉

Hanlin Song Lü Xuechuan Xiaofan Zhang Yaqi Zhang Chenglong Li Xiaohan Gao

辽宁石油化工大学 石油化工学院，辽宁 抚顺 113001

School of Petrochemical Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China

采用水热合成法，制备了铕/钕?2,6?吡啶二甲酸配合物[Ln(2,6?dipic)(2,6?Hdipic)(H2O)2]·4H2O(Ln代表Eu及Nd)，并通过单晶结构测定、磁化率测试、热重分析及差示扫描量热分析，研究了稀土吡啶羧酸类配合物的结构、磁性、热力学性质。结果表明，2个配合物为异质同构体，属于单斜晶系，P21/c空间群；晶体中的2,6?吡啶二甲酸采用了两种不同的配位模式；配合物呈现反铁磁性，有明显的轨道耦合作用；配合物具有较高的热稳定性。

Rare earth complexes of Eu3+ and Nd3+ with pyridine dicarboxylate [Ln(2,6?dipic)(2,6?Hdipic)(H2O)2]?4H2O (Ln: Eu, Nd) were synthesized by hydrothermal method. The structure, magnetism and thermodynamic properties of the complexes were studied by the means of single crystal X?ray diffraction measurement, magnetic test, thermogravimetric analysis and differential scanning calorimetry analysis. The results show that two complexes are isostructural crystallizing in the monoclinic system of space group P21/c. There are two different coordination modes for pyridine?2,6?dicarboxylic acid in the crystals. The complexes exhibit antiferromagnetism with obvious orbital coupling effect. The prepared complexes have good thermal stability.

国家自然科学基金项目(21003069)

10.12422/j.issn.1006-396X.2023.01.008