In the center of the photocystom II (left), four manganese atoms (purple), five oxygen atoms (red) and a calcium atom (green) form oxygen-developed complexes. The cluster (right) contains only five atoms in total and looks very simple: two oxygen atoms form a bridge between two manganese atoms, one of which is bound to a third oxygen atom as a terminal lig. Credit: K. Hirsh / HZB
Molecular oxygen formation through photosynthesis
High-spin manganese (v) center discovered
Experimental XMCD Spectrum (MN)2Hey3,, (Green trace), compared to XMCD reference data of manganese (ii) (MN (MN)2,, (45)2,, (Blue trace). (42) XMCD pattern of (mn2Hey3,, 640 agrees with manganese (ii) in EV, but follows the reverse data in the sign of manganese (V) above 643 EV. It indicates antiferomegnetic coupling of local high-spin states in manganese (ii) and manganese (v) centers (MN (MN2Hey3,,Leading a overall quartet to spin state. Credit: Journal of the American Chemical Society (2025). Doi: 10.1021/jacs.4c14543
A very special sample
Unlock the mysteries of photosynthesis in Basi II
Citation: The discovery of high-spin manganese centers highlights photosynthesis (2025, 20 February).
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