Berlin 2005 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 30: POSTER: Chemical physics
CPP 30.22: Poster
Dienstag, 8. März 2005, 16:30–18:30, Poster TU D
Ultrafast Excited-State Excitation Dynamics in a quasi-1D Light-Harvesting-Antenna based on Ru(II) and Pd(II) Chromophores — •Benjamin Dietzek1, Wolfgang Kiefer1, Jörg Blumhoff2, Lars Böttcher2, Sven Rau2, Dirk Walther2, Jürgen Popp3, and Michael Schmitt3 — 1Institut für Physikalische Chemie, Universität Würzburg — 2Institut für Anorganische Chemie, Universität Jena — 3Institut für Physikalische Chemie, Universität Jena
A detailed study on the excited state excitation hopping taking place within a multicenter complex is presented. The charge transfer is initiated by the photoexcitation into the lowest metal-to-ligand charge-transfer band of one of the peripheral Ru(II) chromophores and terminates on the central Pd(II)-subunits. Thus, the system under investigation can be thought of as a model system for an extremely simple quasi-1D inorganic-light-harvesting antenna. The kinetic steps involved in the overall process are inferred from femtosecond time-resolved transient-grating kinetics recorded at spectral positions within the spectral regions of ground state bleach and transient absorption. The data leads to the formulation of a model for the intra-molecular excitation hopping that ascribes intersystem crossing and subsequent cooling to the two fastest among the recorded processes. Following these initial steps charge transfer from the Ru- to the one of the Pd-chromophores is observed. A 220 ps-component that is observed in the ground state recovery only is attributed to excitation hopping between the two identical Pd-chromophores.