Feng Lu, Ryan A. Zarkesh and Alan F. Heyduk A Redox-Active Ligand as a Reservoir for Protons and Electrons: O2 Reduction at Zirconium(IV) European Journal of Inorganic Chemistry 2012
The redox-active [ONO] ligand platform coordinates zirconium(IV) to form(ONOcat)ZrCl(THF)2 (1) and (ONHO)ZrCl2(THF) (2). In 2, the ligand retains one proton in addition to its redox-active pair of electrons. Exposure of 2 to O2 results in a four-electron, two-proton reaction to form [(ONOq)ZrCl2(μ-OH)]2 (3). This reaction occurs because the ligand platform serves as a reservoir for both electrons and protons in small-molecule activation reactions.
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