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CPP: Chemische Physik und Polymerphysik
CPP 6: Electronic Structure and Spectroscopy I
CPP 6.7: Talk
Monday, March 27, 2006, 16:15–16:30, ZEU 114
Orientation of Absorption Dipoles in Rigid Bichromophoric Systems as determined by Single Molecule Techniques — •Burkhard Fückel1, Gerald Hinze1, Fabian Nolde2, Klaus Müllen2, and Thomas Basché1 — 1Institut für Physikalische Chemie, Universität Mainz, Jakob-Welder-Weg 11, 55099 Mainz, Germany — 2Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
The orientation of the absorption transition dipoles has been investigated in several rigid bichromophoric systems using polarization resolved single molecule spectroscopy. Depending on whether both chromophores within the bichromophores were the same or not, two different experimental techniques have been applied. In case of chemically identical chromophores fluorescence transients with polarization modulated excitation have been acquired prior and after bleaching of one of the components. Bichromophoric systems with different chromophores (donor/acceptor type) on the other hand allow for wavelength selective addressing of the chromophores. By analyzing the polarization dependence, we occasionally find significant deviations of the orientations of the transition dipoles from the values predicted by the molecular structure. This surprising observation is attributed to a symmetry breaking induced by the heterogeneous environment.