Erlangen 2022 – scientific programme
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MO: Fachverband Molekülphysik
MO 13: Femtosecond Spectroscopy III
MO 13.1: Talk
Wednesday, March 16, 2022, 14:30–14:45, MO-H5
Ultrafast excited-state dynamics of new Fe(II) photosensitizers with linked organic chromophores — •Miguel Andre Argüello Cordero1, Ayla Kruse1, Philipp Dierks2, Matthias Bauer2, and Stefan Lochbrunner1 — 1University of Rostock, Germany — 2University of Paderborn, Germany
Photocatalytic approaches for the generation of solar fuels are of rising interest, due to their potential as source for renewable energy. As one key component they contain typically metal-based photosensitizers (PS) to absorb sunlight. Because of the low costs and availability of iron, PS based on it are currently intensively investigated to replace their rare and noble metal-based analogues. When the PS absorb light a metal-to-ligand charge-transfer state is populated. Its lifetime should be in the ns region to perform chemical reactions. In this work we present newly synthetized Fe(II)-based PS with an organic chromophore linked to its ligand backbone. With this additional unit the complexes not only show a wider absorption range in the visible. After optical excitation emissive excited states with lifetimes of some ns seem to become populated. Comparison with the emission behaviour of the pure ligands lead to the assumption that the chromophore moiety undergoes electronic decoupling from the rest of the ligand, if the ligand is linked to the Fe(II) centre. This may lay a basis for the exploration of the reservoir effect, facilitating a populated state located on the linked chromophore. Here we present our results on ultrafast pump-probe absorption and time-resolved emission spectroscopy of these new PS and discuss them with respect to the electronic relaxation pathways.