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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.