Two-dimensional magnetic lanthanide materials are highly sought after in the advancement of spintronic devices featuring atomic-thin structures. While the Shastry-Sutherland (SS) lattice presents a promising platform for such materials, its application in metal-organic systems has been constrained by synthetic complexities. Here, we developed a highly effective method to achieve the required metal-organic compound of the SS lattice through post-synthetic modification of dimer compounds, following the distinctive conjugated dihydrazide-bridged orthogonal-dimer structure. The resulting compound, DyCl2 (ppch)0.5∙2DMF, (H2ppch = N'-(pyrazine-2-carbonyl)pyrazine-2-carbohydrazide, PH-Dy), exhibited a distorted SS lattice. Notably, the easy axis of the Dy(III) ion was nearly perpendicular to the two-dimensional plane, fostering the coexistence of ferromagnetic and antiferromagnetic interactions within the structure. Furthermore, the compound demonstrates complex slow relaxation of magnetization. Theoretical computations revealed that the magnetic interactions arising from the polymerization of dimers significantly affect the relaxation dynamics of PH-Dy. This work provides a novel approach for synthesizing two-dimensional magnetic compounds, thereby paving the way for advanced materials in the field.

中文翻译：

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二维磁性镧系元素金属有机框架中的 Shastry-Sutherland 晶格†


二维磁性镧系材料在具有原子薄结构的自旋电子器件的发展中备受追捧。虽然 Shastry-Sutherland （SS） 晶格为此类材料提供了一个有前途的平台，但它在金属有机体系中的应用一直受到合成复杂性的限制。在这里，我们开发了一种高效的方法，通过二聚体化合物的合成后改性来实现 SS 晶格所需的金属有机化合物，遵循独特的共轭二氢肼桥正交二聚体结构。所得化合物 DyCl2 （ppch）0.5∙2DMF，（H2ppch = N'-（吡嗪-2-羰基）吡嗪-2-碳酰肼，PH-Dy）表现出扭曲的 SS 晶格。值得注意的是，Dy（III） 离子的易轴几乎垂直于二维平面，促进了结构内铁磁和反铁磁相互作用的共存。此外，该化合物表现出复杂的缓慢磁化弛豫。理论计算表明，二聚体聚合产生的磁相互作用显着影响 PH-Dy 的弛豫动力学。这项工作为合成二维磁性化合物提供了一种新方法，从而为该领域的先进材料铺平了道路。