Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster: Metal Substrates - Structure, Epitaxy, Growth and Adsorption
O 41.1: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
Surface Chemical Bond of a Non-Alternant Aromatic Molecule on Metal Substrates — •Lukas Ruppenthal1, Benedikt P. Klein1, Nadine J. van der Heijden2, Markus Franke3, Claudio K. Krug1, Stefan R. Kachel1, Phil Rosenow1, Francois Posseik3, Martin Schmid1, Ralf Tonner1, Ingmar Swart2, Christian Kumpf3, and J. Michael Gottfried1 — 1FB Chemie, Philipps-Universität Marburg, Germany — 2Debye Insitute, Utrecht University, The Netherlands — 3Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Germany
Metal/organic interfaces have a large impact on the performance of organic-electronic devices, which makes their understanding an important target in surface science. Up to now, the focus has been almost exclusively on aromatic systems with alternant topology such as pentacene, which have a uniform charge distribution and highly delocalized frontier orbitals. In contrast, non-alternant aromatic systems have non-uniform charge distributions and more localized frontier orbitals. These properties are potentially interesting for organic electronics. In this contribution, we present a systematic study of the non-alternant aromatic molecule azulene on the (111) surfaces of Cu and Ag and compare it to its alternant counterpart naphthalene on the basis of NEXAFS, UPS, TPD, nc-AFM, STM and NIXSW measurements. Periodic DFT calculations confirm that the non-alternant topology results in much stronger interaction with metal surfaces, especially in the case of Cu(111), and that the resulting surface chemical bond is more localized.