The first room‐temperature X‐ray absorption spectra of higher oxidation states of the tetra‐manganese complex of photosystem II
- 18 January 2002
- journal article
- Published by Wiley in FEBS Letters
- Vol. 512 (1-3) , 116-120
- https://doi.org/10.1016/s0014-5793(02)02237-8
Abstract
The manganese (Mn) complex of photosystem II catalyzes water oxidation. For the first time, its advancement through the reaction cycle was monitored by time-resolved X-ray absorption measurements at the Mn K-edge at room temperature. The complex was stepped through its four oxidation states by nano-second-laser flashes applied to samples exposed to the X-ray beam. Time courses of the X-ray fluorescence intensity were recorded during a flash sequence. Extended X-ray absorption fine-structure spectra were recorded with the S(1), S(2), and S(3) oxidation states highly populated. The room temperature data is compatible with the formation of a third di-mu-oxo bridge between two Mn atoms upon the S(2)-->S(3) transition.Keywords
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