Dresden 2009 – scientific programme
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O: Fachverband Oberflächenphysik
O 30: Metal substrates: Adsorption of organic / bio molecules IV
O 30.8: Talk
Wednesday, March 25, 2009, 12:15–12:30, SCH A118
Covalently bound molecular chains on an ultrathin insulating film — •Christian Bombis1, Leif Lafferentz1, Hao Yu2, Stefan Hecht2, Francisco Ample3, Christian Joachim3, and Leonhard Grill1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Institut für Chemie, Humboldt Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany — 3CEMES-CNRS, 29 rue J. Marvig, PO Box 4347, 31055 Toulouse Cedex, France
The adsorption of single covalently bound molecular chains on an ultrathin insulating film of NaCl on a metallic substrate is presented for the first time. In the emerging field of molecular electronics, ultrathin films of NaCl are attracting increasing attention since it was successfully demonstrated that they provide mandatory electronic decoupling of single organic molecules from an underlying metallic substrate while still allowing a sufficient flow of current for the investigation by scanning tunneling microscopy (STM). Conjugated polymers are promising candidates as organic nano-wires. The studied covalently bound molecular chains are formed by organic on-surface-synthesis of dibromoterfluorene (DBTF) molecules on a Au(111)-surface. The adsorption of these polymeric chains, which form molecular interconnects from the metallic substrate on top of an insulating NaCl film, is investigated at the single-molecule level with an STM working at low temperatures (13 K). To further illuminate the adsorption properties of DBTF on top of the ultrathin film of NaCl, electron scattering quantum chemistry (ESQC) calculations are performed.