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Updated: Sep 29, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
First steps towards time-resolved BioXAS at room temperature: state transitions of the manganese complex of oxygenic
Michael Haumann1, Pavel Pospísil, Markus Grabolle
1Freie Universität Berlin, FB Physik, Arnimallee 14, D-14195 Berlin, Germany. haumann@physik.fu-berlin.de
Abstract:
Structural changes and redox transitions at the metal atoms of the active site are essential for the understanding of the catalytic mechanisms of biological metalloenzymes. First steps towards studying these processes by time-resolved X-ray absorption spectroscopy on protein samples (BioXAS) are reported. Photosystem II (PSII) catalyses the light-driven oxidation of bound water molecules at a tetranuclear manganese complex yielding the molecular oxygen of the atmosphere. In this work, first time-resolved XAS results under quasi-physiological conditions (at room temperature, non-crystalline samples) on PSII are presented. Perspectives of time-resolved BioXAS are discussed.
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