Photoactivation is the process by which the oxygen-evolving complex (OEC) of photosystem II (PSII) is assembled. A series of tetramanganese complexes were synthesized to model possible intermediates using a preorganized trimanganese(II) complex, an equivalent of Mn(II) salt, an oxygen atom source, and an oxidant. Altering these variables controlled the degree of oxidation and oxygen atom content, providing a series of tetramanganese complexes incorporating one, two, three, or four oxygen atoms and possessing oxidation states ranging from MnII3MnIII to MnIII2MnIV2. Interconversion of these complexes was explored; in particular, a MnIII4O3 partial cubane was reversibly converted to a MnIII2MnIV2O4 cubane utilizing water and a chemical oxidant.

Tetramanganese complexes with controlled oxygen atom incorporation: Modeling photoassembly of the oxygen-evolving complex in photosystem II

243rd National Meeting (2012)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.