Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 81: Poster Focus Session: Molecular Nanostructures on Surfaces - New Concepts towards Complex Architectures

O 81.5: Poster

Wednesday, March 14, 2018, 18:15–20:30, Poster A

Coverage dependent self-assembly structures of Co (II) 5, 15-diphenylporphyrin on Cu (111) — •Feifei Xiang, Anja Gemeinhardt, and M. Alexander Schneider — Solid State Physics, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany

The self-assembly structure of Co (II) 5,15-diphenylporphyrin (Co-DPP) on Cu (111) as a function of molecular coverage is studied and compared with unmetalated 5,15-diphenylporphyrin (2H-DPP) by low temperature scanning tunneling microscopy. Both 2H-DPP and Co-DPP show chirality on the copper surface due to the distortion of the molecular skeleton. 2H-DPP can only form chain-like, 1D structures on the surface. The self-assembly structure of Co-DPP varies from low molecular coverage to very dense coverage. At very low molecular coverage, the Co-DPP forms triangular structures and 1-D chains, which follow the 3-fold symmetry of the substrate. When the molecular coverage is higher than half monolayer, Co-DPP forms square and rectangular 2D networks caused by the chirality of the molecular configurations. At full monolayer coverage the molecules are closely packed in a racemic mixture.