Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Tuesday: Organic Molecules on Inorganic Surfaces
O 42.1: Poster
Dienstag, 2. April 2019, 18:00–20:00, Poster D
LT-UHV-STM Investigations on Various Supramolecular Structures of Benzylnaphthoic Diimides Adsorbed on an Au(111)-Surface — •Bertram Schulze Lammers1,2, René Ebeling2, Elena Dirksen3, Thomas J. J. Müller3, and Silvia Karthäuser2 — 1Institute of Physics and Center for Nanotechnology, University of Münster, Germany — 2Peter Grünberg Institut (PGI-7) and JARA-FIT, Forschungszentrum Jülich GmbH, Germany — 3Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität Düsseldorf, Germany
By means of the LT-UHV-STM technique we investigated 2,7-dibenzyl 1,4,5,8-naphthalenetetracarboxylic diimide (BNTCDI), which consists of a naphthalene diimide (NDI) backbone and two benzyl groups. On a Pt(111)-surface it showed the formation of an effective transport path via hybrid BNTCDI/Pt d-states [1]. For a deeper understanding we investigated BNTCDI on an Au(111)-surface, where a weak physisorption is expected. As a result, we obtained one- and two-dimensional supramolecular structures. Orbital-resolved STM imaging allows us to identify intramolecular hydrogen bonds between the NDI-backbones as the driving force for the one-dimensional arrangements on step-edges. The two-dimensional structures on the terraces emerge as ordered and disordered molecular double layers. Locally resolved STS measurements reveal the characteristic electronic properties of BNTCDI and the influence on these by different substrate coupling strengths. In particular, we identify a LUMO-shift and an edge-state coupling as prominent adsorption driven influences. [1] DOI: 10.1021/acs.jpcc.7b09911