Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Transport and Spectroscopy in Molecular Nanostructures I (related to SYMN, jointly with MO)

CPP 32.11: Vortrag

Mittwoch, 16. März 2011, 16:45–17:00, ZEU 160

Excited states dynamics of two-dimensional donor-acceptor systems — Juliane Köhler¹, •Ingo Fischer¹, Tatjana Quast¹, Johannes Buback¹, Tobias Brixner¹, and Christoph Lambert² — ¹Institut für Physikalische und Theoretische Chemie, Universität Würzburg — ²Institut für Organische Chemie, Universität Würzburg

Since electron transfer (ET) is one of the fundamental steps in the working principle of optoelectronic devices, the aim of our work is the systematic study of the optically induced ET in donor-acceptor compounds. Our interest lies in the excited states dynamics that is associated with the subsequent back-electron transfer which can be determined by time-resolved transient absorption spectroscopy on a fs- and ps- timescale. Here, we present our recent experimental results on donor-substituted truxenones which are interpreted in the framework of the Marcus theory. As donor we chose the triarylamine because of its low reorganization energy. The truxenone itself is known to be a good acceptor and its C₃h symmetry allows the substitution of three donor branches. Hence, the ET dimension is extented from one to two. Furthermore we investigated the fluorenone which is the central building block of the acceptor to distinguish their excited state dynamics from the CT state.