【作者】 聂瑶瑶； 褚晓雅； 崔建中； 高洪苓；

【Author】 Yao-Yao Nie;Xiao-Ya Chu;Jian-Zhong Cui;Hong-Ling Gao;Department of Chemistry, University of Tianjin;

【机构】 天津大学理学院化学系；

【摘要】 在过去的二十年里,单分子磁体（SMMs）在储存和处理磁信息方面的独特优势吸引了人们的注意。^[1]近几年的研究表明由于明显的磁各向异性,重镧系离子尤其是Dy³⁺离子,已经被用于设计并构造新的SMMs。^[2]基于此思路,我们合成了一粒具有磁弛豫行为的四核配合物。一个四核的三价镧系离子配合物[Dy₄（TTA）₄L₄]·4CH₃OH（1）（TTA=噻吩三氟乙酰丙酮）已经合成,并对其进行了结构、红外光谱、紫外光谱、热重、PXRD和磁性等性质的表征。X射线单晶衍射表明该配合物属于三斜晶系PT空间群。图1为该配合物的分子结构图。该结构单元中包含四个Dy³⁺离子,四个TTA、四个8-羟基喹啉席夫碱配体L^2-以及不参与配位的四个甲醇溶剂分子。每个Dy³⁺离子均采取八配位模式,邻近的Dy1和Dy2离子通过两个L^2-配体的μ₂-O（O1和O4）原子桥连,形成近似菱形的结构,其被配体L^2-的羧酸根基团进一步相互连接形成具有对称中心的四核簇。该配合物的虚部曲线在12K以下存在明显的频率依赖信号。磁性研究表明该配合物存在缓慢的磁弛豫行为（图2）。更多还原

【Abstract】 During the past two decades,single-molecule magnets（SMMs） have caused the attention of many people due to unique advantages in storing and processing magnetic information.^[1]Recent research shows that the havy lanthanide ions,especially the Dy³⁺ ion,have been used to design and construct new SMMs,because of their significant magnetic anisotropy.^[2]Based on this thoughtfulness,we have synthesized a tetranuclear complex with magnetic relaxation behaviors.In this paper,a tetranuclear Ln（Ⅲ） complex[Dy₄（TTA）₄ L₄]·4 CH₃ OH（1） has been synthesized,structurally and magnetically characterized.At the same time,the complex were characterized by IR,UV,TGA,PXRD.Single-crystal X-ray diffraction data show that lcrystallizes in the triclinic space group P1.The molecular structure of the complex 1 is shown in Figure 1,and it is composed of four Dy³⁺ions,fourTTA,and four 8-hydroxyquinoline Schiff base derivativeL^2-,and there are four free methanol molecules.Each Dy³⁺ion is eight-coordinated configuration.The neighboring Dy1 ion and Dy2 ion are bridged through two μ₂-O（O1 和 O4） atoms from two L^2-ligandsforming a diamond-like structure,which can be further linked each other by the carboxylate group from L^2- ligands to form a tetranuclear clusterwith symmetric center（Fig.1）.For complex 1,out-of-phase signal of ac magnetic susceptibility exhibit strong frequency dependence below 12 K.Magnetic studies reveal that 1 exhibits slow magnetic relaxationbehavior（Fig.2）.更多还原