Berlin 2014 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 21: Photochemistry
MO 21.4: Vortrag
Freitag, 21. März 2014, 11:15–11:30, BEBEL HS213
Electron and Energy Transfer Processes in Homogeneous Photocatalytic Systems — •Antje Neubauer1, Sergey I. Bokarev2, Gilbert Grell2, Aleksej Friedrich1, Patrick Schwarzbach1, David Schallenberg3, Wolfram W. Seidel3, Henrik Junge4, Matthias Beller4, Oliver Kühn2, and Stefan Lochbrunner1 — 1Institut für Physik, Universität Rostock — 2Institut für Physik, Universität Rostock — 3Institut für Chemie, Universität Rostock — 4Leibniz-Institut für Katalyse Rostock
Photocatalytic water splitting for hydrogen generation has recently gained high scientific attention. However, there are only a few studies that focus on mechanistic insight on a molecular level.
Here we investigate homogeneous photocatalytic systems for water reduction based on Iridium(III)-photosensitizers (IrPS) with the aim to clarify the mechanisms of the individual reaction pathways relevant for photocatalysis. By employing time-resolved photoluminescence spectroscopy as well as time-dependent density functional theory calculations we address the following reaction steps: i) electron transfer from a sacrificial donor to the excited IrPS, and ii) excited state quenching of IrPS by an iron catalyst.
In addition to the unbound multi-component system, we study the intramolecular processes of a dinuclear Iridium-Nickel-complex with a novel phenanthroline-5,6-dithiolate bridging ligand. Such complexes have the potential of fast electron or energy transfer as essential reaction step in photophysical applications. For both systems, the role of electron and energy transfer processes is highlighted.