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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A supramolecular chain of dimeric Dy single molecule magnets decorated with azobenzene ligands
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A supramolecular chain of dimeric Dy single molecule magnets decorated with azobenzene ligands

机译:一种二聚体单分子磁铁的超分子链,装饰着偶氮苯配体

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摘要

We report the synthesis, ab initio calculations, magnetic and optical characterization of a Dy-III-based dimeric compound named DyAZO. The dimers self-organize into a supramolecular chain decorated with photo-isomerizable azobenzene ligands. DyAZO displays single-molecule magnet (SMM) behavior. However, ab initio calculations highlight a quite strong admixture of M-J states of the H-6(15/2) level of Dy-III ions, the presence of low-lying excited M-J states and antiferromagnetic Dy-Dy dipolar coupling. This favors zero-field fast tunneling. Accordingly the Dy-doped analogue YDyAZO (5.5% Dy doping) displays enhanced magnetic relaxation with a hysteresis that is observed at 0.5 K. The influence of the cis- to trans-isomerization of the decorating azobenzene ligand on magnetic properties has been tested for both solid samples and solutions of DyAZO and YDyAZO. This provides hints for the synthesis of future Dy-based photo-isomerizable molecules.
机译:我们报道了Dyazo的Dy-III基二聚体化合物的合成,AB初始计算,磁性和光学表征。 二聚体自组织成一根超分子链,装饰着光相异化的偶氮苯配体。 Dyazo显示单分子磁体(SMM)行为。 然而,AB Initio计算突出了Dy-III离子的H-6(15/2)水平的M-J态相当强烈的混合物,存在低洼激发的M-J态和反铁磁体Dy-Dy偶极耦合。 这有利于零场快速隧道。 因此,掺杂掺杂的模型ydyazo(5.5%dy掺杂)显示出在0.5k时观察到的滞后增强的磁性弛豫。对装饰偶氮苯配体的CIS-反式异构化对磁性的影响已经过测试 Dyazo和Ydyazo的固体样品和溶液。 这为合成未来的基于Dy的光相似分子提供了提示。

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