Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 18: Molecular Electronics and Photonics
CPP 18.2: Vortrag
Dienstag, 8. März 2016, 09:45–10:00, H42
Bending a chromophore in well-defined π-conjugated polygonic model systems: impact on photophysical properties — •Philipp Wilhelm1, Thomas Stangl1, Nina Schönfelder2, Georgiy Poluektov2, Sigurd Höger2, Jan Vogelsang1, and John M. Lupton1 — 1Universität Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany — 2Universität Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany
Conjugated polymers are a prime example for the complex interplay between morphology and function. Single-molecule spectroscopy has helped us in unraveling the large heterogeneity in this class of materials. But it has become apparent that even a single conjugated polymer chain contains such a complexity that it is difficult to derive a microscopic picture of the photophysical processes taking place in a single chain. We therefore introduce π-conjugated polygonic model systems, which all consist of a certain number of the same chromophoric unit. If we reduce this number the degree of bending increases, which makes the investigated molecules ideal candidates to study the impact of chromophore bending on spectroscopic observables. We go from the ensemble to the single molecule level to unmask the heterogeneity within the systems. By comparing the spectroscopic properties of molecules between different groups as well as the heterogeneity within a group, we can extract the influence of bending on the spectral properties. Extrapolating the results obtained from these systems onto conjugated polymers provides a highly heterogeneous picture regarding single chromophores that can exist on a conjugated polymer chain.