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MO: Fachverband Molekülphysik
MO 13: Poster – Ultrafast Electronic Dynamics
MO 13.3: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG
Electronic relaxation dynamics of iron(III) complexes functionalized with chromophores — •Samira Dabelstein1, Ansgar Döring1, Miguel Andre Argüello Cordero1, Lennart Schmitz2, Jakob Steube2, Matthias Bauer2, Franziska Fennel1, and Stefan Lochbrunner1 — 1University of Rostock, Rostock, Germany — 2Paderborn University, Paderborn, Germany
Conventional photosensitizers for photocatalysis are usually made from rare and valuable precious metals. This has prompted the search for alternatives based on first-row transition metals. Iron-based photosensitizers are among these alternatives and emerge as potential candidates, but they are limited by their short-lived charge transfer states. One strategy to overcome this limitation is targeted ligand design. This study presents a series of emitting iron(III) complexes modified with chromophores, featuring either phenyl or anthracene groups, directly attached to the ligand backbone. The anthracene complex shows unexpectedly fast relaxation dynamics in solution, attributed to a charge transfer state extended over the entire ligand, which becomes accessible only after chromophore coplanarization [1]. To investigate this hypothesis further, the complexes were embedded in a polymer matrix to restrict conformational changes. Femtosecond transient absorption UV-Vis spectroscopy, revealed for both complexes decay dynamics differing from the solution case. The results support in the case of anthracene the hypothesis of an additional relaxation pathway driven by chromophore coplanarization.
[1] L. Schmitz et al., Inorg. Chem. 64 (2025), 14101.
Keywords: iron(III)-complexes; photocatalysis; polymer matrix; photosensitizer; LMCT