Regensburg 2013 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 8: Surface Chemical Reactions and Heterogeneous Catalysis I

O 8.7: Vortrag

Montag, 11. März 2013, 12:00–12:15, H33

Interfacial complexation reaction in vacuo by metal-organic chemical vapour deposition — •Anthoula C. Papageorgiou¹, Sybille Fischer¹, Seung Cheol Oh¹, Francesco Allegretti¹, Alissa Wiengarten¹, Knud Seufert¹, Saranyan Vijayaraghavan¹, Katharina Diller¹, Robert G. Acres², Kevin C. Prince², Florian Klappenberger¹, Willi Auwärter¹, Joachim Reichert¹, and Johannes V. Barth¹ — ¹Physik Department E20, Technische Universität München, 85748 Garching, Germany — ²Sincrotrone Trieste, 34149 Basovizza, Italy

The fabrication and control of metal coordination compounds or architectures at well-defined interfaces is a thriving research domain with promise for various areas, including single-site catalysis, molecular magnetism, light-harvesting and molecular rotors and machines. To date such systems have been realized either by grafting prefabricated metal-organic complexes or by protocols combining molecular linkers and single metal atoms at the interface. Here we report a different pathway employing metal-organic chemical vapour deposition, as exemplified by the reaction of meso-tetraphenylporphyrin derivatives on atomistically clean Ag(111) with a metal precursor under vacuum conditions. STM, XPS and NEXAFS reveal the formation of a meso-tetraphenylporphyrin cyclodehydrogenation product that readily undergoes metalation after exposure to the metal precursor vapour and thermal treatment. A self-terminating porphyrin metalation protocol, which proceeds without additional surface-bound by-products, yielding a single, thermally robust layer of metalloporphyrins, is discovered.