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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A salen-type Dy-4 single-molecule magnet with an enhanced energy barrier and its analogues
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A salen-type Dy-4 single-molecule magnet with an enhanced energy barrier and its analogues

机译:具有增强的能垒的塞伦型Dy-4单分子磁体及其类似物

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Four isomorphic tetranuclear lanthanide complexes, namely [Ln(4)(L)(2)(HL)(2)(NO3)(2)(OH)(2)](NO3)(2)center dot 4H(2)O (Ln = Dy (1); Tb (2); Ho (3); Er (4)), constructed using hexadentate salen-type ligand N,N'-bis(3-methoxy-salicylidene) cyclohexane-1,2-diamine, have been isolated. X-ray crystallographic analysis reveals that all of the complexes 1-4 are of discrete tetranuclear structure with a unique {Ln(4)O(8)} core in which four lanthanide ions are coplanar in a rhombic frame. There are two crystallographically unequivalent lanthanide ions, that is the Ln1(III) ion which is nine-coordinated in a monocapped square-antiprismatic geometry of the C-4v point group and the Ln2(III) ion which is eight-coordinated in a distorted bicapped trigonal-prismatic geometry of the C-2v point group. Magnetic analysis reveals that complex 1 exhibits two slow magnetic relaxations with the highest energy barrier among the reported tetranuclear salen-type dysprosium SMMs. This further extends the available SMMs of salen-type lanthanide complexes.
机译:四个同构四核镧系元素络合物,即[Ln(4)(L)(2)(HL)(2)(NO3)(2)(OH)(2)](NO3)(2)中心点4H(2)O (Ln = Dy(1); Tb(2); Ho(3); Er(4)),使用六齿萨林型配体N,N'-双(3-甲氧基-水杨基)环己烷-1,2-构造二胺,已被分离。 X射线晶体学分析表明,所有配合物1-4都是具有独特{Ln(4)O(8)}核的离散四核结构,其中四个镧系元素离子在菱形框架中共面。晶体学上有两个不等价的镧系离子,即Ln1(III)离子,它在C-4v点基团的单峰方形反棱角几何中是九配位的,而Ln2(III)离子是在畸变的八坐标中配位的。 C-2v点组的二等边三角形棱镜几何。磁性分析表明,复合物1在报道的四核Salen型SMM中表现出两次缓慢的磁弛豫,具有最高的能垒。这进一步扩展了萨伦型镧系元素络合物的可用SMM。

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