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Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 47: Organic films IV

O 47.5: Talk

Friday, March 31, 2006, 12:15–12:30, PHY C213

Comparative UHV-STM study of adsorption structures formed from a family of oligo-(phenylene ethynylenes) with systematical variation of geometry and functional groups — •Christian Bombis1, Carsten Busse1, Siegrid Weigelt1, Martin Noergaard1, Martin Knudsen2, Kurt V. Gothelf2, Eva Rauls1, Bjoerk Hammer1, Flemming Besenbacher1, and Trolle R. Linderoth11Department of Physics and Astronomy, and iNANO, University of Aarhus, 8000 Aarhus C, Denmark — 2Department of Chemistry, and iNANO, University of Aarhus, 8000 Aarhus C, Denmark

Using scanning tunneling microscopy we have systematically explored the influence of the geometry of molecules and the chemical nature of their functional groups on formed adsorbate structures. For this purpose we utilized compounds from a family of organic molecules, oligo-(phenylene ethynylenes), which have been deposited on the Au(111) surface under ultra high vacuum conditions. The elementary member of this family consists of a highly conjugated linear backbone functionalized with aldehyde, hydroxyl and bulky tert-butyl groups while compounds with bent and three-spoke geometries represent geometrical variants. The study with systematic variation of the endgroup chemistry supports the hypothesis, that only in the case, where intermolecular hydrogen bonds can form, does a more open network phase form instead of a close packed structure held together by non-specific Van-der-Waals interactions. Theoretical modelling based on the DFT-B method is currently being performed to further illuminate this observation.

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