Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 109: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures VII
O 109.4: Vortrag
Freitag, 16. März 2018, 11:15–11:30, MA 004
Thermally-activated Self-assembly and In Situ Oxidation of a Reduced Decaazapentacene — David Miklik1, •Fatemeh Mousavi2, Aisha Ahsan2, Anna Middleton3, Yoshitaka Matsushita1, Jan Labuta1, Paul Karr5, Pavel Svec1,6, Filip Bures7, Gary Richards1,8, Francis Souza3, Thomas Jung1,4, and Jonathan Hill1 — 1MANA-NIMS, Tsukuba, Japan — 2University of Basel, Switzerland — 3University of North Texas, USA — 4Paul Scherrer Institute, Switzerland — 5Wayne State College, USA — 6Institute of Macromolecular Chemistry, Praha, Czech Rep. — 7University of Pardubice, Czech Rep. — 8Ochanomizu University, Otsuka, Japan
The higher pyrazinacenes are a newly synthesized class of molecules which may take an important role in organic semiconductors. This is due to their expected n-type behaviour which complements to the already important p-type pentacene derivatives with their closely related molecular structure. We report on the supra-molecular interactions and self-assembly of octaazatetracene and decaazapentacenes, two different lengths molecules in this class. On atomically clean Cu(111) the initially achiral compounds take a chiral conformation upon adsorption. Both compounds are imaged individually and form structurally related chains. Dehydrogenation occurs upon thermal activation as recognized by its stronger adsorption in the form of individual units. This on-surface reaction is compared to the dehydrogenation in solution. Experimental evidence is provided by Scanning Tunneling Microscopy and X-ray Photoelectron Spectroscopy.