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MO: Fachverband Molekülphysik

MO 19: Posters 4: Novelties in Molecular Physics: Femtosecond Spectroscopy, Molecular Clusters, Cold Molecules and Helium Droplets

MO 19.8: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Photophysics and Photochemistry of a Dinuclear Pt-Pt Complex and its Trinuclear Ag-Pt-Pt Derivative Studied by Femtosecond Time-Resolved UV/Vis Spectroscopy in Solution — •Fabian Rupp¹, Liedy Florian¹, Sebastian V. Kruppa², Christoph Riehn², and Rolf Diller¹ — ¹Dept. of Physics, TU Kaiserslautern — ²Dept. of Chemistry, TU Kaiserslautern, 67663 Kaiserslautern, Germany

Metal-metal interactions are crucial for the design and application of multinuclear transition metal complexes in new electronic devices or chemical catalysis. In a comparative study we investigated the photophysical and photochemical properties of the model compound tetrakis-µ-pyrophosphitodiplatinate(II) (PtPOP) and its Ag-derivative (AgPtPOP) in solution by fs time-resolved UV/Vis spectroscopy. Whereas PtPOP possesses a strong absorption band in the electronic ground state at 369 nm, the band is shifted to 398 nm for AgPtPOP, allowing selective photoexcitation. PtPOP excited states dynamics such as vibrational cooling, intersystem crossing, coherent wave packet dynamics [1] and electron detachment [2] have been studied intensively. On these grounds the influence of the added Ag⁺ on the molecular dynamics is deduced in particular via wave packet oscillation period and dephasing time. This also allows to charcaterize the shapes of the potential energy surfaces of the electronic ground and first excited singlet state, respectively.
[1] R. van der Veen et al., JACS, 2011, 133, 305
[2] S. V. Kruppa et al., Int. J. Mass. Spec., 2015, accepted