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O: Fachverband Oberflächenphysik

O 12: Organic-Inorganic Hybrid Systems and Organic Films II

O 12.4: Vortrag

Montag, 20. März 2017, 15:45–16:00, WIL A317

Competition of surface-assisted organometallic and dehydrogenation reactions of non-functionalized porphyrin on Cu (111) — •Feifei Xiang, Anja Gemeinhardt, and M. Alexander Schneider — Solid State Physics, Friedrich-Alexander-University Erlangen-Nürnberg, 91058, Erlangen, Germany

The adsorption properties, self-assembly and surface assisted reactions of 5,15-diphenylporphyrin (2H-DPP) on Cu(111) are studied by low-temperature scanning tunneling microscopy in ultra-high vacuum. When deposited at room temperature and imaged at 80 K, well-ordered chain-like 2H-DPP structures along Cu [11-2] and equivalent directions are found that are stabilized by a weak interaction between the phenyl and pyrrole rings of neighboring molecules. At elevated annealing temperatures, an intramolecular dehydrogenation reaction is first triggered along with the Cu metalation of the DPP core producing a new planar Cu-DPP species on the surface. After that, two types of oligomer reaction products are formed, one of which consists of the planar Cu-DPP species linked by C-Cu-C bonds and the other by C-C covalent bonds. The latter product is the dominant species on the surface. We argue that is due to much faster reaction rates of the covalent bonded species than of the Cu linked species on Cu (111).