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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
【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(L1)2(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DyⅢ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DyⅢ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DyⅢ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(L1)2(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 DyⅢ ions into a centrosymmetric binuclear molecule with the large p-conjugated tripyridine acting as capping ligand to complete the coordination polyhedron of DyⅢ ion.More interestingly,resulting from the strong anisotropy of the pentagonal bipyramidal DyⅢ 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.
【Key words】 lanthanide complex; crystal structure; single molecule magnet; effective energy barrier; anisotropy;
- 【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