Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 9: Femtosecond Spectroscopy II
MO 9.2: Vortrag
Dienstag, 13. März 2012, 11:00–11:15, V38.03
Time-resolved studies on the photoinduced electron transfer in mixed-valence donor–acceptor oligomers — •Florian Kanal1, Stefan Ruetzel1, Han Lu2, Christoph Lambert2, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
Mixed-valence triarylamine-donor–triarylmethyl-acceptor compounds are interesting model systems for investigating photoinduced electron transfers. These compounds possess a broad absorption band in the near infrared spectral region originating from an intervalence charge transfer (IVCT).
Here, we present femtosecond transient absorption experiments on two different alternating donor–acceptor triads consisting of a donor–acceptor–donor and an acceptor–donor–acceptor pattern. For comparison the respective donor–acceptor subunit as well as the subunit dimer were also investigated. By using the output of an amplified Ti:Sapphire femtosecond laser one can pump the systems directly into the IVCT state. The reduced acceptor as well as the oxidized donor show typical transient absorption bands, which are probed with a whitelight supercontinuum. The molecular dynamics are unraveled by a global data fitting procedure. Environment-dependent contributions of the dynamics are identified by performing the experiments in solvents of different polarity.