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MO: Fachverband Molekülphysik
MO 21: Ultrafast Dynamics II
MO 21.4: Vortrag
Donnerstag, 14. März 2024, 15:15–15:30, HS 3044
Time-resolved insights in the fs-range on novel Fe(III)-complexes with functional modifications — •Samira Dabelstein1, Jakob Steube2, Miguel Andre Argüello Cordero1, Franziska Fennel1, Lennart Schmitz2, Marvin Krupp1, Christoph von der Oelsnitz1, Matthias Bauer2, and Stefan Lochbrunner1 — 1University of Rostock, Germany — 2Paderborn University, Paderborn, Germany
Precious metal-based photosensitizers in photochemistry face scarcity and extraction challenges. There's a growing shift towards Earth-abundant metal alternatives, with iron being a promising, widely available, and cost-efficient candidate. The filled t2g orbitals in Fe(II)-complexes facilitate metal-to-ligand charge transfer (MLCT) upon optical excitation, while the ligand-to-metal charge transfer (LMCT) state is optimally achieved in Fe(III)-complexes owing to the partially filled t2g orbitals. In this study, we present a series of emitting Fe(III)-complexes modified with functional groups. These modified variants exhibit emission from LMCT states. The lifetime and energy of the LMCT state appear to be modulated by the attachment of diverse functional groups to the ligand's backbones. Our findings, obtained through time-resolved methods, specifically femtosecond transient absorption UV-Vis spectroscopy and streak camera measurements, are presented herein. These results are thoroughly examined in the context of electronic relaxation dynamics, shedding light on the intricate processes governing the observed phenomena.
Keywords: photosensitizer; iron; photochemistry; NHC-donor; cyclometallation