Li Jingcheng, Merino-Díez Nestor, Carbonell-Sanromà Eduard, Vilas-Varela Manuel, de Oteyza Dimas G, Peña Diego, Corso Martina, Pascual Jose Ignacio
CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain.
Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), 20018 Donostia-San Sebastián, Spain.
Sci Adv. 2018 Feb 16;4(2):eaaq0582. doi: 10.1126/sciadv.aaq0582. eCollection 2018 Feb.
We report on the construction and magnetic characterization of a fully functional hybrid molecular system composed of a single magnetic porphyrin molecule bonded to graphene nanoribbons with atomically precise contacts. We use on-surface synthesis to direct the hybrid creation by combining two molecular precursors on a gold surface. High-resolution imaging with a scanning tunneling microscope finds that the porphyrin core fuses into the graphene nanoribbons through the formation of new carbon rings at chemically predefined positions. These ensure the stability of the hybrid and the extension of the conjugated character of the ribbon into the molecule. By means of inelastic tunneling spectroscopy, we prove the survival of the magnetic functionality of the contacted porphyrin. The molecular spin appears unaffected by the graphenoid electrodes, and we simply observe that the magnetic anisotropy appears modified depending on the precise structure of the contacts.
我们报道了一个全功能混合分子系统的构建及其磁性表征，该系统由单个磁性卟啉分子通过原子精确接触与石墨烯纳米带相连组成。我们利用表面合成法，通过在金表面结合两种分子前体来指导混合体系的创建。用扫描隧道显微镜进行高分辨率成像发现，卟啉核通过在化学预定义位置形成新的碳环而融合进石墨烯纳米带中。这些确保了混合体系的稳定性以及纳米带共轭特性向分子的延伸。通过非弹性隧穿光谱，我们证明了接触的卟啉的磁功能得以保留。分子自旋似乎不受类石墨烯电极的影响，我们仅观察到磁各向异性根据接触的精确结构而出现改变。
