摘要
通过溶剂热方法合成了一个以2-[(2-羟基苯基)亚甲基联二腙]-N'-[(2-羟基苯基)亚甲基]-丙酰腙(H3L)为配体的稀土镝(Ⅲ)配合物[Dy2(CH3CN)2(H2O)2(HL)2(Cl)2]·2CH3CN,并通过单晶和粉末X-射线衍射、元素分析、红外光谱、热重分析、直流和交流磁化率对其结构和磁学性能进行了全面地表征。结构研究表明,该配合物结晶于单斜P21/c空间群,晶胞参数为a=0.78136(2)nm,b=1.81946(6)nm,c=1.63321(5)nm,β=97.365(3)º,V=2.32182(12)nm^3,Z=2。在该配合物中,双去质子的HL2-配体连接两个畸变的双帽三棱柱构型的DyIII离子形成中心对称的双核结构。该配合物在零场下呈现出单分子磁体行为,其自旋磁矩翻转的有效能垒和指前因子分别为91.7 K和5.04×10^−6 s。
A dysprosium(Ⅲ)complex[Dy2(CH3CN)2(H2O)2(HL)2(Cl)2]·2CH3CN was synthesized by solvothermal method with 2-[(2-hydroxyphenyl)methylene]-N-[(2-hydroxyphenyl)methylene]-propylidene(H3L)as ligand.Crystal structure and magnetic properties of the complex were comprehensively characterized by single crystal and powder X-ray diffraction,elemental analysis,infrared spectroscopy,thermogravimetric analysis,DC and AC susceptibility.Structural studies show that the complex crystallizes in the monoclinic P21/c space group with a=0.78136(2)nm,b=1.81946(6)nm,c=1.63321(5)nm,β=97.365(3)º,V=2.32182(12)nm^3 and Z=2.In this complex,the double deprotonated HL2-ligand connects two distorted double-capped triangular prism DyⅢ ions to form a centrosymmetric binuclear structure.The complex exhibits single-molecule magnet under zero field,and its effective energy barrier for spin magnetic moment inversion and pre-exponential factor are 91.7 K and 5.04×10^–6 s,respectively.
作者
张瑜
丁波
杨恩翠
赵小军
ZHANG Yu;DING Bo;YANG En-cui;ZHAO Xiao-jun(College of Chemistry,Tianjin Normal University,Tianjin 300387,China;Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry,Tianjin 300387,China;Tianjin Key Laboratory of Structure and Performance for Functional Molecules,Ministry of Education,Tianjin 300387,China)
出处
《井冈山大学学报（自然科学版）》
2020年第3期13-18,共6页
Journal of Jinggangshan University (Natural Science)
基金
国家自然科学基金项目(21371134)。
关键词
稀土金属配合物
晶体结构
单分子磁体
有效能垒
各向异性
rare earth metal complex
crystal structure
single-molecule magnet
effective energy barrier
anisortropy
