Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 96: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures VI
O 96.6: Talk
Thursday, March 15, 2018, 16:15–16:30, MA 004
Digging for silver – surface chemistry of tin(IV)-phthalocyanine-dichloride on Ag(111) — •C. Zwick1, E. Wruss2, G. van Straaten3, M. Gruenewald1, T. Ueba4, R. Forker1, C. Kumpf3, S. Kera4,5, E. Zojer2, and T. Fritz1 — 1FSU Jena, Germany — 2TU Graz, Austria — 3Forschungszentrum Jülich, Germany — 4IMS Okazaki, Japan — 5Chiba University, Japan
The peculiarities of the dye molecule tin(IV)-phthalocyanine-dichloride (SnCl2Pc) originate from its functionalization with Cl atoms above and below the central tin atom. These are expected to crucially impact on interface formation due to the altered chemical reactivity compared to Cl-free phthalocyanines. We report on the monolayer growth of SnCl2Pc on Ag(111), focusing on the role played by the Cl atoms in terms of structure formation and surface chemistry. By combining state-of-the-art low-temperature scanning probe microscopy (SPM), distortion-corrected low-energy electron diffraction (LEED) and X-ray standing waves (XSW) measurements, an extensive structural characterization could be realized. This includes the lateral and vertical adsorption geometry of the molecules within the adlayer as well as its epitaxial relation to the substrate. Evidence of chemically altered molecules due to a surface reaction was found by means of SPM and photoelectron emission spectroscopy (PES). Simulations based on density functional theory (DFT) support this conclusion. In this regard, one of the most crucial aspects is the partial dechlorination of SnCl2Pc to SnClPc. Surprisingly, the single remaining Cl atom is penetrating the silver surface, substituting Ag atoms.