Mn^IV₄O₄ Model of the S₃ Intermediate of the Oxygen-Evolving Complex: Effect of the Dianionic Disiloxide Ligand.

ABSTRACT: Synthetic complexes provide useful models to study the interplay between the structure and spectroscopy of the different S_n-state intermediates of the oxygen-evolving complex (OEC) of photosystem II (PSII). Complexes containing the Mn^IV₄ core corresponding to the S₃ state, the last observable intermediate prior to dioxygen formation, remain very rare. Toward the development of synthetic strategies to stabilize highly oxidized tetranuclear complexes, ligands with increased anion charge were pursued. Herein, we report the synthesis, electrochemistry, SQUID magnetometry, and electron paramagnetic resonance spectroscopy of a stable Mn^IV₄O₄ cuboidal complex supported by a disiloxide ligand. The substitution of a

SUBMITTER: Shiau AA 

PROVIDER: S-EPMC11472716 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature