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Self-Assembly And Conformation Of Tetrapyridilporphyrin On The Ag(111) Surface, Willi Auwärter, Alexander Weber-Bargioni, Andreas Riemann, Agustin Schiffrin, R. Fasel, O. Gröning, Johannes V. Barth
Self-Assembly And Conformation Of Tetrapyridilporphyrin On The Ag(111) Surface, Willi Auwärter, Alexander Weber-Bargioni, Andreas Riemann, Agustin Schiffrin, R. Fasel, O. Gröning, Johannes V. Barth
Physics & Astronomy
We present a low-temperature scanning tunneling microscopy (STM) study on the supramolecular ordering of tetrapyridyl-porphyrin (TPyP) molecules on Ag(111). Vapor deposition in a wide substrate temperature range reveals that TPyP molecules easily diffuse and self-assemble into large, highly ordered chiral domains. We identify two mirror-symmetric unit cells, each containing two differently oriented molecules. From an analysis of the respective arrangement it is concluded that lateral intermolecular interactions control the packing of the layer, while its orientation is induced by the coupling to the substrate. This finding is corroborated by molecular mechanics calculations. High-resolution STM images recorded at 15 K allow …