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Chemistry · Glossary

What is Oxygen-evolving complex?

Definition 24.15 University Chemistry — Year 3 · Chapter 24 — Bioinorganic Chemistry

The oxygen-evolving complex of photosystem II is the Mn4CaO5\mathrm{Mn_4CaO_5} cluster that oxidises water to dioxygen in photosynthesis.

The Kok cycle of the oxygen-evolving complex. Each photon absorbed by photosystem II removes one electron from the manganese cluster (protons leave on the way); the fourth oxidation gives S_4, which releases dioxygen and binds two water molecules again.
The Kok cycle of the oxygen-evolving complex. Each photon absorbed by photosystem II removes one electron from the manganese cluster (protons leave on the way); the fourth oxidation gives S4\mathrm S_4, which releases dioxygen and binds two water molecules again.
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