Bonn 2025 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 22: Ultrafast Dynamics III
MO 22.7: Vortrag
Donnerstag, 13. März 2025, 12:30–12:45, HS XVI
Femtosecond-spectroscopy of novel Fe(III)-complexes demonstrating a resevoir effect — •Samira Dabelstein1, Lennart Schmitz2, Franziska Fennel1, Miguel Andre Argüello Cordero1, Jakob Steube2, Matthias Bauer2, and Stefan Lochbrunner1 — 1University of Rostock, Germany — 2Paderborn University, Germany
Conventional photosensitizers for photocatalysis are typically derived from rare and valuable precious metals, prompting the search for alternatives based on first-row transition metals. Among these, iron-based photosensitizers emerge as potential candidates but are limited by their short-lived charge transfer states. To overcome this limitation, targeted ligand design is employed as a strategy. This study presents a series of emitting iron(III) complexes modified with chromophores, featuring either phenyl or anthracene groups. The chromophores are attached to the ligand via a methyl spacer. While the phenyl-extended complexes exhibit behavior similar to the original complex, the anthracene-extended complexes reveal a reservoir effect, characterized by a population transfer from the ligand-to-metal charge transfer state to the triplet state of anthracene. Additionally, a correlation is observed between the number of attached anthracene units and the rate of population transfer. Our findings, obtained through time-resolved methods, specifically femtosecond transient absorption UV-Vis spectroscopy and streak camera measurements, are discussed in detail.
Keywords: photosensitizer; Fe(III); photochemistry; resevoir effect; ligand design