Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 3: Scanning Probe Techniques: Method Development I

O 3.10: Vortrag

Montag, 20. März 2017, 12:45–13:00, TRE Phy

Characterization of polycyclic conjugated hydrocarbons by means of NCAFM — •Zsolt Majzik1, Niko Pavliček1, Manuel Vilas-Varela2, Nikolaj Moll1, Dolores Pérez2, Enrique Guitián2, Gerhard Meyer1, Diego Peña2, and Leo Gross11IBM Research-Zurich, 8803 Rüschlikon, Switzerland — 2CIQUS and Departamento de Química Orgánica, Universidade de Santiago de Compostela. Santiago de Compostela 15782, Spain.

The development of organic field effect transistors (OFETs) and organic photovoltaics (OPVs) triggered a strong interest for synthesizing and characterizing conjugated polycyclic hydrocarbons. Anti-aromatic and open-shell systems received recently a special attention because of their distinct electronic and magnetic behavior. The strong reactivity of pristine molecules creates a challenge for probing their structural and electrical properties. Until now, the fundamental analyses of these reactive compounds have been limited to theoretical works or the lifetime of a molecule was increased by careful attachment of protecting ligands for experimental investigations. Advances in atomic force microscopy, particularly resolving and modifying the structure of molecules at the atomic scale opened new routes for studying highly reactive compounds. Here we present an alternative route for the synthesis and characterization of conjugated systems. We deposited custom synthesized precursor molecules and carried out the final synthesis step in UHV environment via atomic manipulation. We used combined AFM/STM analyses supported by DFT calculations to determine the aromatic configuration of a molecule.

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