Hannover 2020 – scientific programme
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MO: Fachverband Molekülphysik
MO 16: Femtosecond Spectroscopy II
MO 16.7: Talk
Thursday, March 12, 2020, 15:30–15:45, f102
Ultrafast Dynamics of Fe(II)-based Photosensitizers — •Ayla Päpcke1, Jakob Steube2, Philipp Dierks2, Yannik Vukadinovic2, Matthias Bauer2, and Stefan Lochbrunner1 — 1Institute of Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock (Germany) — 2Institute of Inorganic Chemistry and Center for Sustainable Systems Design (CSSD), University of Paderborn, Warburger Straße 100, 33098 Paderborn (Germany)
Water splitting systems are currently intensively investigated as a potential source for renewable energy. In these systems metal complexes are often used as photosensitizers for absorbing the sunlight. Most of these complexes contain noble metals like iridium and ruthenium. To replace these rare and expensive metals, iron is a promising candidate since it is earth-abundant, inexpensive, environmentally benign, and results in broad absorption bands in the visible spectral region. After absorption of light a metal-to-ligand charge transfer state is populated which should have a long lifetime in the ns-regime to allow for efficient intermolecular interaction. However, in iron(II)-complexes this lifetime is in the fs to ps-range and thereby relatively short. To extend the lifetime several approaches in the design of the complexes are pursued, e.g. the use of strong σ-donating N-heterocyclic carbene or cyclometalating ligands. Here we present ultrafast pump-probe experiments on such complexes. The electronic relaxation path is characterized by means of the transient absorption spectra and the success of the chemical design strategy is assessed on the basis of the observed lifetimes.