What Can We Learn from a Biomimetic Model of Nature's Oxygen-Evolving Complex?
A recently reported synthetic complex with a Mn4CaO4 core represents a remarkable structural mimic of the Mn4CaO5 cluster in the oxygen-evolving complex (OEC) of photosystem II (Zhang et al., Science 2015, 348, 690). Oxidized samples of the complex show electron paramagnetic resonance (EPR) signals at g ≈ 4.9 and 2, similar to those associated with the OEC in its S2 state (g ≈ 4.1 from an S = 5/2 form and g ≈ 2 from an S = 1/2 form), suggesting similarities in the electronic as well as...[Show more]
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