Journal Article

PUBDB-2024-06843

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ultrafast Two‐Color X‐Ray Emission Spectroscopy Reveals Excited State Landscape in a Base Metal Dyad

Nowakowski, M. ; Huber-Gedert, M. ; Elgabarty, H. ; Kalinko, A.DESY* ; Kubicki, J. ; Kertmen, A. ; Lindner, N. ; Khakhulin, D. ; Lima, F. A. ; Choi, T.-K. ; Biednov, M. ; Schmitz, L. ; Piergies, N. ; Zalden, P. ; Kubicek, K. ; Rodriguez-Fernandez, A. ; Salem, M. A. ; Canton, S. E. ; Bressler, C. ; Kühne, T. D. ; Gawelda, W. (Corresponding author)XFEL.EU* ; Bauer, M. (Corresponding author)Extern*

2024
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/advs.202404348  doi:10.3204/PUBDB-2024-06843

Abstract: Effective photoinduced charge transfer makes molecular bimetallic assemblies attractive for applications as active light-induced proton reduction systems. Developing competitive base metal dyads is mandatory for a more sustainable future. However, the electron transfer mechanisms from the photosensitizer to the proton reduction catalyst in base metal dyads remain so far unexplored. A Fe─Co dyad that exhibits photocatalytic H$_2$ production activity is studied using femtosecond X-ray emission spectroscopy, complemented by ultrafast optical spectroscopy and theoretical time-dependent DFT calculations, to understand the electronic and structural dynamics after photoexcitation and during the subsequent charge transfer process from the FeII photosensitizer to the cobaloxime catalyst. This novel approach enables the simultaneous measurement of the transient X-ray emission at the iron and cobalt K-edges in a two-color experiment. With this methodology, the excited state dynamics are correlated to the electron transfer processes, and evidence of the Fe→Co electron transfer as an initial step of proton reduction activity is unraveled.

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Contributing Institute(s):

1. PETRA-S (FS-PETRA-S)
2. FXE (XFEL_E1_FXE)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. DFG project G:(GEPRIS)390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)

Experiment(s):

1. XFEL Beamline SASE 1 (XFEL)

Appears in the scientific report 2024

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