Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 63: Posters: Scanning Probe Methods
O 63.25: Poster
Wednesday, April 2, 2014, 17:30–21:00, P2
Investigation of 1,6,7,12-tetraazaperylene molecules on an insulating film by means of LT-STM — •Nemanja Kocić1, Peter Weiderer1, Stephan Keller2, Shi-Xia Liu2, Silvio Decurtins2, and Jascha Repp1 — 1Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany — 2Departement für Chemie und Biochemie, Universität Bern, Switzerland
In recent years, metal-organic hybrid structures have received considerable attention because of their tunable electronic and magnetic properties. A promising strategy to obtain thermally and chemically stable structures through covalent bonding of suitable precursors directly on the substrate is the concept of on-surface synthesis. So far, successful demonstrations of on-surface synthesis have been limited to metallic substrates, however, a useful molecular electronic device would require its construction on an insulating surface. To this end, we performed low temperature scanning tunneling microscopy (LT-STM) on the 1,6,7,12-tetraazaperylene molecule (TAPE), which is a highly symmetric, planar, bi-facial bridging ligand with a large extended π-system. As such, TAPE is an attractive bridging ligand for the formation of new multimetallic systems of regularly spaced spin centers. Molecular self-assembly is investigated on an ultrathin insulating film that provides efficient electronic decoupling from the metal substrate, allowing detailed characterization of the molecular orbitals. When thermally activated at 300 K, individual metal atoms and TAPE molecules form metal-molecular complexes.