Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.37: Poster

Tuesday, March 15, 2011, 18:30–22:00, P4

Self-Assembly of Individually Addressable Complexes of C60 and Phthalocyanines on a Metal Surface: Structural and Electronic Investigations — Tomas Samuely¹, Shi-Xia Liu², Marco Haas², Silvio Decurtins², Thomas Jung³, and •Meike Stöhr⁴ — ¹University of Basel, Switzerland — ²University of Bern, Switzerland — ³Paul-Scherrer-Institute, Switzerland — ⁴University of Groningen, Netherlands

A complex phase behavior was found for a specific phthalocyanine (Pc) derivative adsorbed on either Au(111) or Ag(111). The Pc molecule is symmetrically substituted with eight peripheral di-(tert-butyl)phenoxy (DTPO) groups. The pronounced ability of the DTPO groups to rotate, allows the molecule to adopt different conformations and hence to arrange itself in different ordered patterns. In particular, when all DTPO substituents are arranged above the plane of the Pc core (a bowl-like structure is formed), the interaction of the Pc core with the metal substrate is enabled. Moreover, for such an assembly the hosting properties for the adsorption of C60 were investigated. The C60 molecules adsorb at two clearly distinguishable positions on the predeposited Pc layer: they are in contact either with the metal substrate in between two adjacent Pc molecules or with the Pc core. For the latter case, the C60 is located directly above the pi-conjugated Pc core. Hence, the presented system combines the three following features: (i) the direct electronic interaction between donor and acceptor moieties, (ii) the formation by self-assembly, and (iii) thermal stability. Thereby, the direct investigation of a single donor-acceptor complex is enabled.