Preparation and Properties of an Mn^IV-Hydroxide Complex: Proton and Electron Transfer at a Mononuclear Manganese Site and its Relationship to the Oxygen Evolving Complex within Photosystem II.

ABSTRACT: Photosynthetic water oxidation is catalyzed by a Mn₄O₅Ca cluster with an unprecedented arrangement of metal ions in which a single manganese center is bonded to a distorted Mn₃O₄Ca cubane-like structure. Several mechanistic proposals describe the unique manganese center as a site for water binding and subsequent formation of a high valent Mn-oxo center that reacts with a M-OH unit (M = Mn or Ca^II) to form the O-O bond. The conversion of low valent Mn-OH_n (n = 1,2) to a Mn-oxo species requires that a single manganese site be able to accommodate several oxidation states as the water ligand is deprotonated. To study these processes, the preparation and characterization of a new monomeric Mn^IV-OH complex is described.

SUBMITTER: Taguchi T 

PROVIDER: S-EPMC4286883 | biostudies-literature | 2014 Aug

REPOSITORIES: biostudies-literature