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O: Fachverband Oberflächenphysik
O 58: Organic-Inorganic Systems III: Metal-Organics
O 58.3: Vortrag
Mittwoch, 9. März 2016, 15:30–15:45, S054
Intermolecular interactions among TiOPc molecules on Ag(111) — •Laura Fernández1, Sebastian Thussing1, Antón Brión-Ríos2, Pepa Cabrera-San Felix2, Daniel Sánchez-Portal3, and Peter Jakob1 — 1Fachbereich Physik, Philipps- Universität Marburg, Renthof 5, 35032 Marburg, Germany — 2DIPC, Paseo Manuel Lardizábal 4, 20018 San Sebastián, Spain — 3Centro de Física de Materiales CSIC-UPV/EHU. Paseo Manuel Lardizábal 5, 20018 San Sebastian, Spain
The structure and intermolecular interactions of TiOPc deposited on Ag(111) has been investigated by IR spectroscopy and SPA-LEED. Additionally, the structure and bonding strength of the TiOPc/Ag(111) system has been explored by DFT. According to IR data, deposition of TiOPc (sub)monolayers leads to a ``TiO-up'' adsorption geometry of the molecules on Ag(111). Moreover, we find unambiguous evidence for an attractive interaction between neighboring TiOPc molecules, which leads to the formation of 2D islands with well-defined long range order (c-phase) upon cooling (sub)monolayer films to temperatures below 70K. This behavior is ascribed to the dominance of van der Waals interactions between adsorbed TiOPc molecules, and it is in contrast to the intermolecular repulsion observed for the CuPc/Ag(111) system. Repulsive intermolecular interactions induced by the parallel oriented dipoles of the TiO groups are negligible presumably due to the large lateral molecular dimensions. According to DFT calculations, the molecule-metal interaction of TiOPc on Ag(111) is notably weaker than in the case of CuPc, and it is lacking any net charge transfer.