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Closer to photosystem II: a Co4O4 cubane catalyst with flexible ligand architecture.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2013
Author Evangelisti Fabio, Güttinger Robin, Moré René, Luber Sandra, Patzke Greta R,
Project Homogeneous photocatalytic water splitting
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Original article (peer-reviewed)

Journal Journal of the American Chemical Society
Volume (Issue) 135(50)
Page(s) 18734 - 7
Title of proceedings Journal of the American Chemical Society
DOI 10.1021/ja4098302


We introduce the novel Co4O4 complex [Co(II)4(hmp)4(μ-OAc)2(μ2-OAc)2(H2O)2] (1) (hmp = 2-(hydroxymethyl)pyridine) as the first Co(II)-based cubane water oxidation catalyst. Monodentate acetate and aqua ligands lend the flexible environment of 1 closest resemblance to photosystem II among its tetranuclear mimics to date. Visible-light-driven catalytic activity of 1 increases with pH value through aqua ligand deprotonation. The Co(II) core combines robustness and stability with flexibility through a new type of water-oxidation mechanism via mobile ligands.