Three sandwich-type zinc(II)-lanthanide(III) clusters: structures, luminescence and magnetic properties
Three sandwich-type zinc(II)-lanthanide(III) clusters: structures, luminescence and magnetic properties
复制标题
三种夹心型锌(II)-镧系(III)团簇：结构、发光和磁性能
DOI：
10.1039/c7ra01469d
复制
发表时间：
2017
期刊：
影响因子：
3.9
通讯作者：
Zhang Mo
中科院分区：
文献类型：
--
作者：
Song Xue Qin;Liu Pan Pan;Wang Cai Yun;Liu Yuan An;Liu Wei Sheng;Zhang Mo
三个基于甲氧基取代的水杨酰胺 Salen 样配体和邻香草醛的新型夹心型六核 ZnII-LnIII 簇，[Zn2Ln4(HL)4(o-vanilline)2(OH)4(CH3OH)2]·2NO3·5CH3OH (Ln = Eu、Tb 和 Dy，H3L =合成1-(2-羟基-4-甲氧基-苯甲酰胺基)-2-(2-羟基-3-甲氧基-亚苄基氨基)-乙烷)。单晶结构分析表明，这些 ZnII-LnIII 簇显示出一个羟基桥接的四核 LnIII4 核心，夹在两个 ZnII 离子、四个双去质子化 HL2− 和两个单去质子化邻香兰素的环境中。光物理测定表明，ZnII-EuIII 团簇显示出源自配体和 EuIII 离子的混合发射，而其他两个仅在可见光区域显示以配体为中心的发射。磁性研究表明，ZnII-DyIII 团簇表现出罕见的铁磁行为，在零场下具有缓慢的磁弛豫行为。
Three new sandwich-type hexanuclear ZnII–LnIII clusters based on a methoxy substituted salicylamide Salen-like ligand and o-vanilline, [Zn2Ln4(HL)4(o-vanilline)2(OH)4(CH3OH)2]·2NO3·5CH3OH (Ln = Eu, Tb and Dy, H3L = 1-(2-hydroxy-4-methoxy-benzamido)-2-(2-hydroxy-3-methoxy-benzylideneamino)-ethane) were synthesised. Single-crystal structure analyses reveal that these ZnII–LnIII clusters display a hydroxyl bridged tetranuclear LnIII4 core sandwiched in an environment of two ZnII ions, four doubly deprotonated HL2− and two singly deprotonated o-vanilline. Photophysical determinations indicate that the ZnII–EuIII cluster shows mixed emissions both originating from ligands and EuIII ions, and the other two only display ligand-centered emission in visible region. The magnetic studies reveal that the ZnII–DyIII cluster displays rare ferromagnetic behavior with slow magnetic relaxation behavior at zero field.