Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 30: Focussed session: Functional molecules at surfaces I

O 30.7: Talk

Tuesday, March 27, 2012, 12:30–12:45, A 053

Disorder-order transition at coverages above one monolayer in 2H-tetraphenylporphyrins on Cu(111) — •Michael Stark, Stefanie Ditze, Martin Drost, Florian Buchner, Hans-Peter Steinrück, and Hubertus Marbach — Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058

The understanding of the adsorption behavior of functional molecules on surfaces is a prerequisite for using them as building blocks in molecular devices. In this study, we investigate the coverage dependent supramolecular arrangement of 2H-tetraphenylporhpyrin (2HTPP) on Cu(111) with scanning tunneling microscopy at room-temperature (RT) in ultra-high vacuum. At low coverage, "slow" diffusion of individual 2HTPP molecules along the close- packed atomic rows of the substrate is observed [1,2]. Up to saturation of the first layer, no supramolecular ordering occurs. However, at higher coverage, the formation of ordered domains is found. This behavior is attributed to a complex interplay of intermolecular and molecule-substrate interactions upon increasing 2HTPP coverage..

This work has been funded by the DFG through Sonderforschungsbereich 583.

[1] F. Buchner et al., Chem. Eur. J., (2011), 17, 10226.

[2] F. Buchner et al., J. Phys. Chem. C ,(2011), DOI: 10.1021-jp206675u..