Erlangen 2018 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 4: Photochemistry

MO 4.7: Vortrag

Montag, 5. März 2018, 15:30–15:45, PA 1.150

Spectroscopic Investigation of Fe(II)-Complexes on the fs-Time Scale — •Aleksej Friedrich¹, Peter Zimmer², Matthias Bauer², and Stefan Lochbrunner¹ — ¹Institute of Physics, University of Rostock — ²Department Chemie, Universität Paderborn

Iron-complexes are interesting for photocatalytic applications, because they could act as photosensitizers and replace noble metals. A problem of such Fe-complexes is a short lifetime of the metal-to-ligand charge transfer state (MLCT). One promising way to extend the lifetime is to use ligands in the complex with N-heterocyclic carbene (NHC) moieties.
To get insight into the impact of the NHC ligands on the photophysics of the complexes ultrafast transient absorption measurements are performed. We see a nice correlation between the number of NHC sites and the lifetime of the MLCT state. Fe(II)-complexes with a low NHC number (2) relax from the MLCT state to the lowest metal-centered state within 100 fs while four NHC sites result in a MLCT lifetime of 8 ps.[1]

[1] P. Zimmer et al., Inorg. Chem., accepted.