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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.13: Poster

Dienstag, 1. April 2014, 18:30–22:00, P1

Exploring the cerium-directed assembly of porphyrin derivatives on Ag(111) — •Felix Bischoff, Willi Auwärter, Knud Seufert, David Ecija, Saranyan Vijayaraghavan, and Johannes Barth — Technische Universität München, Department of Physics, E20, Garching, Germany

In the field of molecular nanoscience considerable effort is put in the bottom-up synthesis of novel interfacial compounds and architectures. In this domain, rare-earth metal complexes are particularly interesting regarding their function as single-molecule magnets, field effect transistors or molecular rotors. Among the series of rare-earth complexes, those incorporating cerium are especially versatile because cerium can be in a +III or +IV oxidation state. Here we assess the metal-directed assemblies afforded by adsorbed porphyrin derivatives (2H-TPP and 2H-P) and Cerium atoms on Ag(111) in an STM study. Depending on the preparation procedure, observed products were, amongst others, modified single molecules, highly ordered cerium-porphyrinato islands, extended double-decker chains and even triple-deckers. The multiple reaction products reveal that the understanding and control of the reaction parameters is a prerequisite for well-defined products. Thus we explored routes for the controlled synthesis of distinct cerium-porphyrinato arrangements.