The interest in molecular nanostructures on surfaces emerges from their prospective applications in nanoscale electronics, solar cells, energy storage devices, and other fields. Non-covalent intermolecular interactions in molecular self-assemblies facilitate the formation of long-range ordered patterns by usage of molecular recognition. In contrast, the fabrication of long-range ordered two-dimensional covalently-linked networks via on-surface reactions is still a major challenge in ultra-high vacuum owing to the irreversible nature of the covalent bonds.<br/><br/>In my presentation, I will focus on recent high-resolution scanning probe microscopy experiments in combination with density-functional theory about the bottom-up fabrication and electronic properties of atomically precise one- and two-dimensional molecular nanostructures on metals. Thereby, the effect of the flexibility, the symmetry, and chirality of the precursor molecules on the structure formation of covalently-linked molecular structures will be discussed. In particular, I will outline how well-ordered nanoporous 1D and 2D covalent molecular structures, can be fabricated by use of debromination coupling reactions. The narrowing of the band gap from single precursor molecules to the 2D materials due to the extension of the π-system will be shown. Moreover, we found also delocalized electronic states in surface-supported organometallic networks, which benefit from crystallization into large networks upon annealing.<br/>

Bottom-up fabrication of atomically precise molecular nanostructures through on-surface reactions

2019 Spring National Meeting

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