Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 126, Issue 40, Pages 12819-12826Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja048051+
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Photochemically induced dynamic nuclear polarization (photo-CIDNP) has been observed in photosystem I of spinach by C-13 magic angle spinning solid-state NMR under continuous illumination with white light. An almost complete set of chemical shifts of the aromatic ring carbons of a single Chl a molecule has been obtained which is assigned to the P2-cofactor of the primary electron donor P700. Since all light-induced C-13 NMR signals appear to be emissive, a predominance of the three-spin mixing mechanism over the differential decay mechanism is proposed. The origin of the strong contribution of the three-spin mixing mechanism and the differences with photosystem II are discussed.
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