Berlin 2005 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 13: Selforganized and supramolecular assemblies II
CPP 13.3: Talk
Monday, March 7, 2005, 11:45–12:00, TU C243
Addressing metal centers in complex supramolecules by STS — •M.S. Alam1, S. Strömsdörfer1, A.M. Ako2, V.V. Dremov1, M. Ruben3, R.W. Saalfrank2, L.K. Thompson4, and P. Müller1 — 1Physikalisches Institut III, Universität Erlangen-Nürnberg — 2Institut für Organische Chemie, Universität Erlangen-Nürnberg — 3Institut für Nanotechnologie, FZ Karlsruhe — 4Dept. of Chemistry, Memorial University, St. John’s, NL, Canada
Investigating elementary structure formation processes of supramolecules on substrate surfaces is a rather complex task. As the contrast in scanning tunnelling microscopy (STM) is produced by the local density of electronic states, extracting information on the geometrical shape of a complex molecule is not straightforward. Using a home built STM under ambient conditions, we succeeded to combine high resolution topography mapping with simultaneous current-voltage characteristics (STS) measurements on single molecules deposited on highly oriented pyrolytic graphite (HOPG) surfaces. We present our recent results on Co 2x2 and Mn 3x3 grid molecules as well as on ring-shaped Fe ion chains (ferric wheels). Small, regular molecule clusters as well as separated single molecules were observed. One of the most interesting results is that the location of the metal ions in their organic matrix is directly addressable by STS.