Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 17, Pages 5226-5230Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b01372
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Funding
- U.K. BBSRC Doctoral Training Partnership (DTP) program
- BBSRC [1783540] Funding Source: UKRI
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A new paradigm for the high- and low-spin forms of the S-2 state of nature's water-oxidizing complex in Photosystem II is found. Broken symmetry density functional theory calculations combined with Heisenberg-Dirac-van Vleck spin ladder calculations show that an open cubane form of the water-oxidizing complex changes from a low-spin, S = 1/2, to a high-spin, S = 5/2, form on protonation of the bridging O4 oxo. We show that such models are fully compatible with structural determinations of the S-2 state by X-ray free-electron laser crystallography and extended X-ray absorption fine structure and provide a clear rationale for the effect of various treatments on the relative populations of each form observed experimentally in electron paramagnetic resonance studies.
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