S = 3 Ground State for a Tetranuclear Mn^IV₄O₄ Complex Mimicking the S₃ State of the Oxygen-Evolving Complex.

ABSTRACT: The S₃ state is currently the last observable intermediate prior to O-O bond formation at the oxygen-evolving complex (OEC) of Photosystem II, and its electronic structure has been assigned to a homovalent Mn^IV₄ core with an S = 3 ground state. While structural interpretations based on the EPR spectroscopic features of the S₃ state provide valuable mechanistic insight, corresponding synthetic and spectroscopic studies on tetranuclear complexes mirroring the Mn oxidation states of the S₃ state remain rare. Herein, we report the synthesis and characterization by XAS and multifrequency EPR spectroscopy of a Mn^IV₄O₄ cuboidal complex as a spectroscopic model of the S₃ state. Results show th

SUBMITTER: Lee HB 

PROVIDER: S-EPMC7236085 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature