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一个新颖的混合配体双核镝(Ⅲ)配合物:合成、结构和磁性能研究

A NEW BINUCLEAR DYSPROSIUM(Ⅲ) COMPLEX WITH MIXED LIGANDS:SYNTHESIS,STRUCTURE,AND MAGNETISM

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【作者】 戴睿鹏冯丹丹张瑜李言杨恩翠赵小军

【Author】 DAI Rui-peng;FENG Dan-dan;ZHANG Yu;LI Yan;YANG En-cui;ZHAO Xiao-jun;College of Chemistry,Tianjin Normal University;Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry;Ministry of Education,Tianjin Key Laboratory of Structure and Performance for Functional Molecules;

【通讯作者】 赵小军;

【机构】 天津师范大学化学学院无机-有机杂化功能材料化学教育部重点实验室天津市功能分子结构与性能重点实验室

【摘要】 通过溶剂热方法合成了一个以4′-(对苯酚)-2, 2′:6′, 2"-三联吡啶(L1)和N, N’-双(亚水杨基)亚乙二胺(L2)为混合配体的稀土金属配合物[Dy2(L12(L2)Cl2(SCN)4],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。该配合物结晶于三斜P1空间群,晶胞参数为a=0.90268(4) nm,b=0.90572(3) nm,c=1.91170(7) nm,α=83.092(3)o,β=82.848(3)o,g=74.189(4)o,V=1.4860(11) nm3,Z=1。在该配合物中,中性的N, N’-双(亚水杨基)亚乙二胺配体连接相邻的Dy离子形成中心对称的松散双核结构,而具有大p共轭骨架的三联吡啶分子则作为封端配体参与Dy离子配位多面体的构建。更为有趣的是,源于五角双锥构型的Dy离子的强各向异性,该配合物呈现出场诱导的单分子磁体行为,其磁矩翻转的有效能垒和指前因子分别为42.7 K和1.3×10-6 s。

【Abstract】 A new dysprosium(Ⅲ)-based complex with mixed 4’-(4-hydroxyphenyl)-2,2’:6’,2’’-terpyridine(L1) and N,N’-bis(salicylidene)ethylenediamine(L2) ligands,[Dy2(L12(L2)Cl2(SCN)4],was solvothermally synthesized,and structurally and magnetically characterized by single-crystal and powder X-ray diffractions,elemental analysis,infrared spectra,thermogravimetric curve,and variable-temperature direct-and alternating-current magnetic susceptibilities.The complex crystallizes in the triclinic P1 space group with a = 0.90268(4) nm,b = 0.90572(3) nm,c = 1.91170(7) nm,α = 83.092(3)o,β = 82.848(3)o,g = 74.189(4)o,V = 1.4860(11) nm3,Z = 1.In the crystal structure,neutral N,N-bis(salicylidene)ethylenediamine ligand aggregates two adjacent Dy ions into a centrosymmetric binuclear molecule with the large p-conjugated tripyridine acting as capping ligand to complete the coordination polyhedron of Dy ion.More interestingly,resulting from the strong anisotropy of the pentagonal bipyramidal Dy ion,the complex displays field-induced single-molecular magnetic behavior with the effective energy barrier and pre-exponential factor of 42.7 K and 1.3×10–6 s.

【基金】 国家自然科学基金项目(21371134)
  • 【文献出处】 井冈山大学学报(自然科学版) ,Journal of Jinggangshan University(Natural Science) , 编辑部邮箱 ,2018年06期
  • 【分类号】O641.4
  • 【被引频次】1
  • 【下载频次】178
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