Closer to Photosystem II: A Co4O4 Cubane Catalyst with Flexible Ligand Architecture
Journal of the American Chemical Society2013Vol. 135(50), pp. 18734–18737
Citations Over TimeTop 10% of 2013 papers
Abstract
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.
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