Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 70: Nanostructures at Surfaces: Other Aspects

O 70.2: Poster

Mittwoch, 9. März 2016, 18:15–20:30, Poster A

Self-metalation of phthalocyanine molecules with silver surface atoms on Ag(110) — •Lars Smykalla, Pavel Shukrynau, and Michael Hietschold — Technische Universität Chemnitz, Institute of Physics, Solid Surfaces Analysis Group, D-09107 Chemnitz, Germany

A direct reaction of molecules with the atoms from the metal surface on which they adsorb ("self-metalation") was first reported as an unwanted process but later on it was also perceived to be a new method for bottom-up synthesis of metal complexes. We report that metal-free phthalocyanine (H2Pc) molecules are able to incorporate Ag atoms from an Ag(110) surface, therefore forming silver phthalocyanine (AgPc).[1] Scanning tunneling microscopy, X-ray photoelectron spectroscopy, and Density functional theory simulations of this reaction are presented. Three different kinds of molecules were found on the surface that are assigned to H2Pc, the corresponding dehydrogenated molecules (Pc), and AgPc. The relative amounts of Pc and AgPc increase with increasing annealing temperature. Simulations of the reaction path indicate that the metalation of H2Pc is endothermic and that the metalation of the dehydrogenated Pc molecule has a significantly lower barrier and is thermodynamically favorable. Our results shows that the orientation of the substrate surface can be crucial for self-metalation reactions because it was not observed for H2Pc on Ag(111).

[1] Lars Smykalla, Pavel Shukrynau, Dietrich R. T. Zahn, and Michael Hietschold J. Phys. Chem. C, 2015, 119 (30), 17228-17234