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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: Nanoparticles II

CPP 9.10: Talk

Monday, March 23, 2009, 16:30–16:45, ZEU 114

STM/CITS investigation of a Co(II) Cubane and a Zn(II) Coordination Polymer — •Michael Stocker¹, Utpal Mitra¹, Viacheslav Dremov¹, Nina Fischer², Frank W. Heineman², Andreas Scheurer², Ayuk M. Ako², Nicolai Burzlaff², Rolf W. Saalfrank², and Paul Müller¹ — ¹Department für Physik, Universität Erlangen-Nürnberg, Germany — ²Department für Chemie und Pharmazie, Universität Erlangen-Nürnberg, Germany

A combination of scanning tunneling microscopy (STM) and current imaging tunneling spectroscopy (CITS) has been performed on a Zn(II) coordination polymer ([Zn(L)(Cl)]_n) and on a Co(II) cubane ([Co₄(HL)₄(Cl)₄]). Both were deposited onto highly oriented pyrolytic graphite (HOPG). In the case of the Zn(II) coordination polymer thick strands as well as single polymer lines were observed. For the Co(II) cubane single molecules were observed. In CITS measurements we found a rather large contrast at the expected location of the Zn and Co metal centers, respectively. This demonstrates that the position of the metal centers within the molecule can be mapped. We discuss local tunneling spectroscopy data.