Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Organic/bio Molecules on Metal Surfaces VI
O 75.7: Vortrag
Donnerstag, 14. März 2013, 17:30–17:45, H38
Assembly, electronic structure and metal-ligand interaction of di-carbonitrile quaterphenyls on an electronically corrugated boron nitride monolayer. — •Tobias Hoh1, Sushobhan Joshi1, Willi Auwärter1, Carlos-Andres Palma1, Florian Klappenberger1, David Écija1, Alissa Wiengarten1, Hermann Sachdev2, and Johannes V. Barth1 — 1Physik Department, E20, TU München, Germany — 2Max-Planck-Institut für Polymerforschung, Germany
Metal-directed assembly at interfaces is important for the engineering of nanostructures. For molecules on metal surfaces, the presence of substrate electrons can lead to strong perturbations of the electronic structure and unique coordination motifs. Here, we present a low temperature scanning tunneling microscopy(STM) study of di-carbontitrile quaterphenyl molecules on an insulating boron nitride(BN) monolayer grown on Cu(111)[1]. The molecules form a dense packed chevron assembly in contrast to open porous pattern observed on Ag(111)[2]. STM images show a nonplanar conformation corroborated by a molecular dynamics simulation. Tunneling spectroscopy evidences decoupling of the molecules from the metal. Moreover, the inhomogenous BN template induces a spatial modulation of the energy of unoccupied molecular orbitals. A subsequent deposition of cobalt atoms generates a four-fold coordination motif.
[1] Joshi, S. et al., Nano Lett. 2012, 12, 5821-5828
[2] Schlickum, V. et al., J. AM. CHEM. SOC. 2008, 130, 11778-11782