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O: Fachverband Oberflächenphysik
O 97: Nanostructures at Surfaces: Molecular Systems II
O 97.12: Vortrag
Donnerstag, 23. März 2017, 18:15–18:30, REC/PHY C213
On-surface indene-formation by methyl bromide cleavage — •Frank Eisenhut1, Dmitry Skidin1, Justus Krüger1, Thomas Lehmann1, Andreas Viertel2, Seddigheh Nikkipar1, Dmitry A. Ryndyk1, Stefan Hecht2, Francesca Moresco1, and Gianaurelio Cuniberti1,3 — 1Institute for Materials Science, Max Bergmann Center of Biomaterials, and Center for Advancing Electronics Dresden, TU Dresden, 01069 Dresden, Germany, — 2Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany, — 3Dresden Center for Computational Materials Science (DCMS), TU Dresden, 01069 Dresden, Germany.
Manufacturing molecules with predefined structural and electronic properties is one of the central tasks in surface science nowadays. We investigate the thermal induced cyclization of dibromo-diphenyl-pyrene on Au(111) using scanning tunneling microscopy (STM) and spectroscopy.
We show that precursor molecules self-assemble on Au(111) and form by annealing intermediate structures assembled in characteristic dimers or tetramers. By further annealing the surface, we can cleave methyl bromide groups and synthetize diindeno-pyrene molecules, as shown by high resolution STM images and dI/dV maps of the electronic orbitals. Density functional theory (DFT) and electron scattering quantum chemistry (ESQC) calculations confirm the experimental results.