Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.78: Poster

Dienstag, 1. April 2014, 18:30–22:00, P2

Poly(phenylene-ethynylene)s and related bichromophoric molecules on HOPG: An STM study — •Stefan-S. Jester, Klaas Remmerssen, Daniela Schmitz, and Sigurd Höger — Universität Bonn, Kekulé-Institut für Organische Chemie und Biochemie, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany

Conjugated polymers have attracted increased attention in the last decades due to their interesting optical and electronic properties. We have recently synthesized and investigated model dimers of conjugated oligomers, linked in a macrocyclic scaffold. Two monodisperse conjugated oligomers of distinct chain length, based on phenylene-ethynylene-butadiynylene entities, are intramolecularly connected by two rigid clamp units, providing a defined distance and alignment in parallel. The lengths and distances of the chromophores are synthetically defined and adjustable with atomic-scale precision. Self-assembled monolayers (SAMs) of the compounds at the solid/liquid interface of highly oriented pyrolytic graphite (HOPG) and 1,2,4-trichlorobenzene (TCB) are studied by scanning tunneling microscopy (STM) with submolecular resolution. The results provide understanding about the shape and structure of the compounds. [1] S.-S. Jester, A. Idelson, D. Schmitz, F. Eberhagen, S. Höger Langmuir 2011, 27, 8205; [2] S. Liu, D. Schmitz, S.-S. Jester, N. J. Borys, S. Höger, J. M. Lupton J. Phys. Chem. B 2013, 117, 4197; [3] S.-S. Jester, D. Schmitz, F. Eberhagen, S. Höger, Chem. Commun. 2011, 47, 8838.