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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Electronic and Optical Properties of Organic Systems II

CPP 7.4: Talk

Monday, March 22, 2010, 14:45–15:00, H39

Visualization of a Zn(II) coordination polymer and a trinuclear Cu(II) complex by STM/CITS — •U. Mitra¹, M. Stocker¹, V. Dremov¹, N. Fischer², F. W. Heinemann², A. Zharkouskaya³, N. Burzlaff², W. Plass³, and P. Müller¹ — ¹Department of Physics and Interdisciplinary Centre for Molecular Materials (ICMM), University of Erlangen-Nürnberg, Germany. — ²Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Germany. — ³Institut für Anorganische und Allgemeine Chemie, Universität Jena, Germany

Topographic measurements and current imaging tunneling spectroscopy (CITS) were performed on a Zn(II) coordination polymer [Zn(L)Cl]_n (L = deprotonated bis(N-methylimidazol-2-ylmethyl) acetic acid) and on a trinuclear Cu(II) complex based on triaminoguanidin ([Cu₃(bipy)₃(^HTAG)](ClO₄)). 10⁻⁹ molar solutions of the materials were deposited onto HOPG. In the case of the Zn(II) coordination polymer, strands of different thickness were observed. Molecular chains consisting of more than one molecule as well as clusters were also visualized for the trinuclear Cu(II) complex. In the CITS measurement, a very large current contrast was observed on the expected location of the Zn(II) and the Cu(II) metal centers. In this sense, we were able to map the internal coordination of the metal centers.