Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures IV
O 64.6: Vortrag
Mittwoch, 14. März 2018, 16:15–16:30, MA 004
On-surface synthesis of nitrogen-doped 5-7-membered nanographenes — •Frank Eisenhut1,2, Dmitry Skidin1,2, Justus Krüger1,2, Marcus Richter1,3, Reinhard Berger1,3, Xinliang Feng1,3, Francesca Moresco1,2, and Gianaurelio Cuniberti1,2,4 — 1Center for Advancing Electronics Dresden (cfaed), TU Dresden, 01062 Dresden, Germany — 2Institute for Materials Science, TU Dresden, 01069 Dresden, Germany — 3Institute for Molecular Functional Materials, TU Dresden, 01062 Dresden, Germany — 4Dresden Center for Computational Materials Science (DCMS), TU Dresden, 01069 Dresden, Germany
We present the on-surface synthesis of five- and seven-membered nitrogen-doped "defective" nanographene molecules by thermally induced cyclodehydrogenation of a nitrogen-containing polycyclic hydrocarbon on the Au(111) surface. The reaction is investigated by scanning tunneling microscopy (STM) at low-temperature. After annealing, we observe mainly non-symmetric planar products. High-resolution STM images on single molecules show the formation of a five- and a seven-membered ring, while the planarity is obtained by the cleavage of one phenyl-group. In a few cases, we observe non-planar bowl-shaped molecules with an Azacorannulene core. This indicates the complete conversion of the precursor molecule into a nitrogen-doped nanographene with four odd-numbered rings. Using scanning tunneling spectroscopy, we investigate the electronic structure of all molecular species.