Regensburg 2007 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: POSTER: Biological Systems + New Materials
CPP 20.25: Poster
Mittwoch, 28. März 2007, 16:00–18:30, Poster B
Nanotemplates from monolayers of electron donors and acceptors self-assembled at solid-liquid interfaces — •Min Ai1, Frank Jäckel1,2, Xinliang Feng3, Wei Zhuang1, Klaus Müllen3, and Jürgen Rabe1 — 1Humboldt University Berlin, Department of Physics, Newtonstr. 15, 12489 Berlin, Germany — 2present address: Stanford University, Department of Chemistry, 333 Campus Drive, CA 94305-5080, Stanford, USA — 3Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
We studied a potential nanotemplate for molecular and organic electronics consisting of an electron-withdrawing acceptor, an alkylated coronenebis(dicarboximide) derivative, and an electron-pushing donor, benzo[o]bistriphenyleno[2,1,12,11-efghi:2*,1*,12*,11*-uvabc] ovalene. Self-assembled monolayers of the neat donor and acceptor and their mixture respectively were investigated by scanning tunneling microscopy (STM) at the interface between an organic solution and highly oriented pyrolytic graphite (HOPG). The pure electron acceptor forms two highly ordered crystalline phases with either one molecule ("oblique cell") or four molecules ("zigzag cell") per unit cell respectively. The neat electron donors could not be visualized. In the electron donor/acceptor mixtures, two distinct types of crystal structures are revealed, one with four donors and one acceptor, and the other with two donors and two acceptors in the unit cell. Molecular packing models are presented according to the STM images. The packing is attributed to the interactions between the molecules and between molecules and HOPG.