Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)

O 35.5: Poster

Tuesday, March 12, 2013, 18:15–21:45, Poster B1

Pattern formation of Ni- and Fe-Tetramethyl-tetraazaanulene on Au(111) — •Thomas Knaak¹, Thiruvancheril G. Gopakumar¹, Bettina Schwager², Felix Tuczek², and Richard Berndt¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel — ²Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel

Saddle shaped Ni- and Fe-tetramethyl-tetraazaannulene (TMTAA) on Au(111) were investigated using low-temperature STM. Surprisingly, we observed the formation of different patterns, depending on the central ion, Ni or Fe. While Ni-TMTAA aggregates at low coverages into chiral clusters, Fe-TMTAA molecules remain isolated from each other and arrange in a hexagonal array. Presumably, different degrees of bending of TMTAA due to Ni and Fe is the origin of the different aggregation behaviors. Financial support by the Deutsche Forschungsgemeinschaft via the SFB 677 is acknowledged.