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MO: Fachverband Molekülphysik

MO 7: Poster: Spectroscopy

MO 7.8: Poster

Dienstag, 12. März 2024, 17:00–19:00, Tent C

Ultrafast UV-Vis spectroscopy on a series of novel Fe(III) photosensitizers with linked organic chromophores — •Miguel Andre Argüello Cordero¹, Lennart Schmitz², Matthias Bauer², and Stefan Lochbrunner¹ — ¹University of Rostock, Germany — ²University of Paderborn, Germany

In recent years, the exploration of photocatalytic methodologies for solar fuel production has garnered attention due to their promise as a sustainable energy source. Central to these approaches are molecular photosensitizers (PS) with a metal component for efficient light absorption. However, the reliance on precious metals in conventional PS has prompted a fervent exploration into alternatives employing cost-efficient metals, like iron. Fe(III)-based PS exhibit a distinctive bichromophoric nature, stemming from the existence of ligand-to-metal charge transfer transitions (LMCT). This unique attribute facilitates the capture of the entire visible spectrum, resulting in the population of enduring LMCT states. The strategic modification of the ligand structure further allows for the modulation of energy levels and excited state lifetimes. In this study, we introduce a series of novel Fe(III) PS featuring organic chromophores attached to their ligand backbones. By extending the chromophores, we uncover intriguing ultrafast electronic dynamics following optical excitation. Their investigation is carried out through fs-UV-Vis transient absorption spectroscopy. This work presents our findings on pump-probe spectroscopy applied to the Fe(III) PS, providing a comprehensive discussion on the observed results in the context of electronic relaxation pathways.

Keywords: Photosensitizer; Iron; Light harvesting; Light conversion; Molecules