Stepwise Investigation of the Influences of Steric Groups versus Counterions To Target Cu/Dy Complexes,Crystal Growth & Design

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Stepwise Investigation of the Influences of Steric Groups versus Counterions To Target Cu/Dy Complexes
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2017-09-08 00:00:00 , DOI: 10.1021/acs.cgd.7b00648
Irina A. Kühne _{1,

2} , Kieran Griffiths ₂ , Amy-Jayne Hutchings ₁ , Oliver P. E. Townrow ₂ , Andreas Eichhöfer ₃ , Christopher E. Anson ₁ , George E. Kostakis ₂ , Annie K. Powell _{1,

3}

Affiliation

From an investigation of varying the steric bulk of a flexible ligand, we have produced a family of structures using similar reaction conditions. Even small changes from a hydrogen atom to a methyl to an ethyl group on the ligand influences the structural outcome, which can also be steered by the nature of the metal source. We employed Schiff base ligands by combining o-vanillin and three different 2-amino-1,3-propandiol units, leading to H₃L₁ (R = hydrogen), H₃L₂ (R = methyl), and H₃L₃ (R = ethyl). The differing nuclearities of the three clusters, 1–3, originate mainly from the steric influence, while this effect is not seen in complexes 4–6, where the general butterfly motif is maintained. We present here the synthesis, crystal structures, and magnetic properties of six new Cu^II-Ln^III complexes, providing valuable insight into future synthetic directions. The topological part includes a table of all Cu^II–Dy^III complexes with nuclearities higher than four and their topological motif. The investigation of the magnetic behaviors reveals that all six complexes show frequency dependent signals in the out-of phase ac susceptibility, which is indicative for single molecule magnets behavior.

中文翻译：

立体基团和抗衡离子对目标Cu / Dy配合物的影响的逐步研究

通过改变柔性配体的空间体积的研究，我们使用相似的反应条件制备了一系列结构。从配体上的氢原子到甲基再到乙基的微小变化都会影响结构结果，这也可以通过金属来源的性质来控制。我们通过将邻香兰素和三个不同的2-氨基-1,3-丙二醇单元结合使用席夫碱配体，从而得到H ₃ L ₁（R =氢），H ₃ L ₂（R =甲基）和H ₃ L ₃（R ＝乙基）。三个集群的不同核数，即1 – 3，主要来自空间影响，而这种影响在复合物4 – 6中看不到，复合物4-6保留了一般的蝴蝶图案。我们在这里介绍了六种新的Cu ^II -Ln ^III配合物的合成，晶体结构和磁性，为未来的合成方向提供了宝贵的见识。拓扑部分包括一张所有核^II级以上的Cu ^II- Dy ^III配合物及其拓扑结构的表格。磁行为的研究表明，所有六个复合物在异相交流磁化率下均显示出频率依赖性信号，这表明了单分子磁体的行为。

更新日期：2017-09-08

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