Rostock 2019 – scientific programme
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MO: Fachverband Molekülphysik
MO 6: Metal Complexes
MO 6.2: Talk
Monday, March 11, 2019, 14:30–14:45, S HS 001 Biologie
Iron complexes as photosensitizers for hydrogen production — •Björn Altenburger1, Ayla Päpcke1, Aleksej Friedrich1, Stefan Lochbrunner1, Philipp Dierks2, Peter Zimmer2, and Matthias Bauer2 — 1Institute of Physics, University of Rostock — 2Department of Chemistry, University of Paderborn
Iron is a promising candidate to replace rare transition metals in photosensitizer complexes used for light harvesting and photocatalytic applications. Even though its electronic properties are a severe obstacle to obtain a long living metal-to-ligand charge transfer (MLCT) state, the availability and environmental aspects make it worthwhile to investigate these complexes. In our research the focus is on Fe(II) complexes with N-heterocyclic carbene ligands which result in an enhanced ligand field. Our investigations using ultrafast transient absorption spectroscopy show that the lifetime of the MLCT state can be increased to several picoseconds utilizing these ligands [1]. Modifying them by adding electron withdrawing groups can prolong the lifetime even further. Recently, along this route developed iron complexes show even fluorescence. Pump-probe measurements are combined with time resolved fluorescence spectroscopy to identify the relaxation pathways and to determine the lifetime of the involved states.
[1] P. Zimmer et al., Inorg. Chem. 2018, 57, 360-373