Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: Organic/bio Molecules on Metal Surfaces II
O 14.2: Vortrag
Montag, 31. März 2014, 16:15–16:30, TRE Phy
Interplay of hydrogen bonding and molecule-substrate interaction in self-assembled adlayer structures of tetra(p-hydroxyphenyl)porphyrin on Ag(110) — •Lars Smykalla1, Pavel Shukrynau1, Michael Hietschold1, Carola Mende2, and Heinrich Lang2 — 1Technische Universität Chemnitz, Institute of Physics, Solid Surfaces Analysis Group, D-09107 Chemnitz, Germany — 2Technische Universität Chemnitz, Institute of Chemistry, Inorganic Chemistry, D-09107 Chemnitz, Germany
The construction of desired molecular architectures on surfaces can be achieved by the self-assembly of molecular building blocks. The arrangement of adsorbed molecules is mainly controlled by a complex interplay between intermolecular interactions, such as hydrogen bonds, dispersion and electrostatic interactions, and the molecule-substrate interaction, that is the adsorption on favourable positions on the substrate lattice. We report on the adsorption and self-organisation of 5,10,15,20-tetra(p-hydroxyphenyl)porphyrin molecules on the highly anisotropic Ag(110) surface. One-dimensional molecular chains as well as three molecular structures with large unit cells, each containing a different number of molecules, were observed using scanning tunnelling microscopy. The molecules in the arrangements form hydrogen bonds and, additionally, show π-π stacking of phenyl-groups. The difference between the unit cells is the number of hydrogen bonds per molecule and correspondingly a different epitaxy. Density Functional Theory calculations are presented to explain the complex adsorption and epitaxial behaviour of these molecules on Ag(110) in detail.