The synthesis of lanthanide‐based organometallic sandwich compounds is very appealing regarding their potential for single‐molecule magnetism. Here, it is exploited by on‐surface synthesis to design unprecedented lanthanide‐directed organometallic sandwich complexes on Au(111). The reported compounds consist of Dy or Er atoms sandwiched between partially deprotonated hexahydroxybenzene molecules, thus introducing a distinct family of homoleptic organometallic sandwiches based on six‐membered ring ligands. Their structural, electronic, and magnetic properties are investigated by scanning tunneling microscopy and spectroscopy, X‐ray absorption spectroscopy, X‐ray linear and circular magnetic dichroism, and X‐ray photoelectron spectroscopy, complemented by density functional theory‐based calculations. Both lanthanide complexes self‐assemble in close‐packed islands featuring a hexagonal lattice. It is unveiled that, despite exhibiting analogous self‐assembly, the erbium‐based species is magnetically isotropic, whereas the dysprosium‐based compound features an in‐plane magnetization.

中文翻译：

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有机镧系三明治配合物的表面合成

镧系有机金属夹层化合物的合成因其单分子磁性的潜力而非常有吸引力。在这里，通过表面合成来利用它在 Au(111) 上设计前所未有的镧系元素定向有机金属夹层配合物。报道的化合物由夹在部分去质子化的六羟基苯分子之间的 Dy 或 Er 原子组成，从而引入了基于六元环配体的独特的均配有机金属夹心家族。通过扫描隧道显微镜和光谱、X射线吸收光谱、X射线线性和圆磁二色性以及X射线光电子能谱，并辅以基于密度泛函理论的计算，研究了它们的结构、电子和磁性。两种镧系元素配合物在具有六方晶格的密堆积岛中自组装。研究表明，尽管表现出类似的自组装，但铒基物质具有磁各向同性，而镝基化合物具有面内磁化。