Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 96: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures VI
O 96.4: Vortrag
Donnerstag, 15. März 2018, 15:45–16:00, MA 004
On the Adsorption Behavior of Cyano-Functionalized Porphyrins on Cu(111) and Ag(111): from Dimers over Molecular Wires to Ordered Supramolecular Two-Dimensional Aggregates — Michael Lepper1, Gretel Siglreithmaier1, Martin Gurrath2, Bernd Meyer2, Hans-Peter Steinrück1, and •Hubertus Marbach1 — 1Lehrstuhl für Physikalische Chemie II — 2Computer-Chemistry-Center; both Universität Erlangen-Nürnberg
We investigate the impact of peripheral cyano functionalization of the well-studied 2H-tetraphenylporphyrin (2HTPP) by scanning tunneling microscopy (STM) and density functional theory (DFT). Interestingly, depending on the number and the geometry of cyano-functionalized phenyl rings, the free-base porphyrins form dimers or 1D-cains after mild annealing on Cu(111). The linking within the dimers and chains is realized by Cu adatoms as evidenced by comparison of STM and DFT [1]. In contrast, the corresponding Cu-porphyrin analogues form peculiar porous highly ordered 2D-islands on Cu(111). On Ag(111), the cyano-functionalized free-base porphyrin molecules assemble into a long-range 2D square order similar to their analogues without cyano functionalization [1]. We will discuss the presented results in regard of the specific roles of molecule-molecule and molecule-substrate interactions, with a particular emphasis on the specific intramolecular conformations [2] and the potential to tailor-make functional molecular architectures. [1] M. Lepper et al., J. Phys. Chem. C, (2017) DOI: 10.1039/C7CC04182A [2] F. Albrecht et al., NanoLett. 16 (2016) 7703; M. Lepper et al., Chemical Communications, 53 (2017) 8207