Edmondson Matthew, Clarke Michael, O'Shea James N, Chen Qiang, Anderson Harry L, Saywell Alex
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, U.K.
Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, U.K.
ACS Nano. 2024 Dec 10;18(49):33390-33397. doi: 10.1021/acsnano.4c09188. Epub 2024 Nov 25.
On-surface synthesis of functional molecular structures provides a route to the fabrication of materials tailored to exhibit bespoke catalytic, (opto)electronic, and magnetic properties. The fabrication of graphene nanoribbons via on-surface synthesis, where reactive precursor molecules are combined to form extended polymeric structures, provides quasi-1D graphitic wires that can be doped by tuning the properties/composition of the precursor molecules. Here, we combine the atomic precision of solution-phase synthetic chemistry with on-surface protocols to enable reaction steps that cannot yet be achieved in solution. Our focus of this work is the inclusion of porphyrin species within graphene nanoribbons to create porphyrin-fused graphene nanoribbons. A combination of scanning tunneling microscopy and photoelectron spectroscopy techniques is used to characterize a porphyrin-fused graphene nanoribbon formed on-surface from a linear polymer consisting of regularly spaced Ni-porphyrin units linked by sections of aryl rings which fuse together during the reaction to form graphitic regions between neighboring Ni-porphyrin units.
功能分子结构的表面合成提供了一条制备具有定制催化、（光）电子和磁性特性材料的途径。通过表面合成制备石墨烯纳米带，即将反应性前驱体分子结合形成扩展的聚合物结构，可提供准一维石墨线，其可通过调节前驱体分子的性质/组成进行掺杂。在此，我们将溶液相合成化学的原子精度与表面合成方法相结合，以实现溶液中尚未实现的反应步骤。我们这项工作的重点是在石墨烯纳米带中引入卟啉物种，以制备卟啉融合的石墨烯纳米带。结合扫描隧道显微镜和光电子能谱技术，对由线性聚合物在表面形成的卟啉融合石墨烯纳米带进行表征，该线性聚合物由规则间隔的镍卟啉单元组成，通过芳环段连接，这些芳环段在反应过程中融合在一起，在相邻镍卟啉单元之间形成石墨区域。
