Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 7: Poster: Femtosecond Spectroscopy

MO 7.7: Poster

Dienstag, 9. März 2010, 16:00–18:30, Lichthof

Transient absorption spectroscopy of a metallo-supramolecular polyelectrolyte — •Tatjana Quast¹, Florian Kanal¹, Iris Hasslauer², Dirk G. Kurth², and Tobias Brixner¹ — ¹Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — ²University of Wuerzburg, Chemical Technology of Advanced Materials, D-97070 Würzburg

Supramolecular chemistry is becoming increasingly important for the design and development of new functional materials. With the help of self-organization, one can create stimuli-responsive materials, which change their properties upon an external stimulus (e.g. change of pH value, temperature). By including metal ions, one can modifiy the magnetic, optical and electronic properties of these materials. Here we present a metallo-supramolecular polyelectrolyte (MEPE), which is constituted of a ditopic Bisterpyridin ligand and a transition metal ion, in this case Fe. This Fe-MEPE forms rigid, rod-like polymers and exhibits a strong metal-to-ligand charge transfer (MLCT) band in the visible spectral range. In order to monitor the dynamics of Fe-MEPE after excitation, we recorded transient absorption spectra of Fe-MEPE in aqueous solution. We excited the MLCT band of the system with a laser pulse from an optical parametric amplifier and probed the dynamics of this band with a whitelight supercontinuum. First results on the dynamics of the Fe-MEPE polymer and the corresponding monomer are presented.