Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 64: Organic Molecules on Inorganic Substrates IV: Adsorption, Growth and Networks

O 64.1: Talk

Wednesday, March 18, 2020, 10:30–10:45, TRE Phy

Interactions in STM-assembled molecular clusters — •Andreas Christ, Markus Leisegang, and Matthias Bode — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

The adsorption of organic molecules on metal surfaces has recently been studied intensive due to their potential application in electronic devices. For coverages up to a monolayer various self-assembled structures, including one-dimensional chains, Kagome lattices, or two-dimensional networks have been observed [1], which evolve from the delicate interplay of intermolecular and molecule-substrate interactions. To investigate these interactions more systematically, we employed STM manipulation of individual phthalocyanine molecules to manufacture molecular clusters and chains which vary in size and geometry. We observe that the tautomerization behavior of a single deprotonated phthalocyanine molecule changes as neighboring molecules are brought in close proximity. By changing the intermolecular distance and relative orientation we find that the tautomerization can be made asymmetric or hindered completely.
[1] Y. Wang et al., AIP Advances 2, 041402 (2012)