Hexanuclear Co4Dy2, Zn4Dy2, and Co4Y2 Complexes with Defect Tetracubane Cores: Syntheses, Structures, and Magnetic Properties
Hexanuclear Co4Dy2, Zn4Dy2, and Co4Y2 Complexes with Defect Tetracubane Cores: Syntheses, Structures, and Magnetic Properties
复制标题
具有缺陷四立方烷核的六核 Co4Dy2、Zn4Dy2 和 Co4Y2 配合物：合成、结构和磁性
DOI：
10.1002/asia.202100571
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发表时间：
2021-08-01
影响因子：
4.1
通讯作者：
Yao，Jin-Lei
中科院分区：
文献类型：
--
作者：
Li，Dawei;Li，Yafei;Yao，Jin-Lei
A hexanuclear heterometallic cluster of composition [Dy2Co4(L)4(NO3)2(OH)4(C2H5OH)2] ⋅ 2 C2H5OH (1) was synthesized by employing a Schiff base 2‐(((2‐hydroxy‐3‐methoxybenzyl) imino)methyl)‐4‐methoxyphenol (H2L) as ligand and utilizing Dy(NO3)3⋅ 6H2O and Co(NO3)2⋅ 6H2O as metal ion sources. X‐ray single‐crystal diffraction analysis indicated that complex1contains a defect tetracubane core and possesses central symmetric structure, with two DyIIIions being in the central body position of the molecule and four CoIIions being arranged at the outer sites. Magnetic studies reveal that complex1behaves as single‐molecule magnet (SMM) with energy barrier of 27.50 K. To investigate the individual contribution of DyIIIand CoIIions to the SMM behavior, another two complexes of formulae [Dy2Zn4(L)4(NO3)2(OH)4] ⋅ 4CH3OH (2) and [Y2Co4(L)4(NO3)2(OH)4(C2H5OH)2] ⋅ 2 C2H5OH (3) were prepared. Complexes1and3are isomorphous. The coordination geometries of DyIIIions in1and2are different. The DyIIIions are eight‐coordinated in2and nine‐coordinated in1. Complex2exhibits SMM behavior with energy barrier of 69.67 K, but complex3does not display SMM property. These results reveal that the SMM behaviors of1and2are mainly originated from DyIIIions. It might be the higher symmetry of DyIIIions in2that results in the higher energy barrier.
