论文标题
直接观察两个最小三角纳米仪的磁接地态
Direct observation of the magnetic ground state of the two smallest triangular nanographenes
论文作者
论文摘要
以三角形的方式融合三个苯环会产生最小的开放壳石墨烯碎片，即$π$延伸，其$π$延伸导致整个非kekulé三角形纳米谱仪的整个家族，具有高旋转基态。在这里，我们报告了在AU（111）表面上未取代的明苯烯的首次合成，这是通过使用扫描隧道显微镜（STM）的尖端结合了水力发生的溶液合成和原子操作的地下激活来实现的。单分子结构和电子表征证实了其开放式S = 1/2基态，从而引起了AU（111）表面的近藤筛选。此外，我们将Pleacrenyl的电子特性与三角形的电子特性进行了比较，该特性是该系列中的第二个同源物，其s = 1基态诱导了未播种的近藤效应。我们的结果在磁性纳米仪的地面合成中设定了一个新的较低尺寸限制，该量子可以用作实现物质的新外来量子阶段的基础。
Fusion of three benzene rings in a triangular fashion gives rise to the smallest open-shell graphene fragment, the phenalenyl radical, whose $π$-extension leads to an entire family of non-Kekulé triangular nanographenes with high-spin ground states. Here, we report the first synthesis of unsubstituted phenalenyl on a Au(111) surface, which is achieved by combining in-solution synthesis of the hydro-precursor and on-surface activation by atomic manipulation, using the tip of a scanning tunneling microscope (STM). Single-molecule structural and electronic characterization confirm its open-shell S = 1/2 ground state that gives rise to Kondo screening on the Au(111) surface. In addition, we compare the phenalenyl's electronic properties with those of triangulene, the second homolog in the series, whose S = 1 ground state induces an underscreened Kondo effect. Our results set a new lower size-limit in the on-surface synthesis of magnetic nanographenes that can serve as building blocks for the realization of new exotic quantum phases of matter.
