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Artificial Photosynthesis
Mechanistic understanding of low-energy pathways for catalytic water oxidation by Ru mononuclear polypyridyl complexes
In
contrast to the proposed catalytic water oxidation mechanism by most of
single-site ruthenium complexes that proceed via the nucleophilic attack of
a water molecule on the RuV=O species, ruthenium(II) complexes containing
4-t-butyl-2,6-di-1',8'-(naphthyrid-2'-yl)-pyridine (or its bisbenzo-derivative),
water and two 4-picoline ligands show the reaction mechanism proceeding by
the thermodynamically more favorable “direct pathway” via [RuIV=O]2+, which
avoids the higher oxidation state [RuV=O]3+ in neutral and basic media. Our
experimental results on the pH-dependent onset catalytic potentials
indicative of a PCET driven low-energy pathway for the formation of products
with an O–O bond (such as [RuIII–OOH]2+ and [RuIV–OO]2+)
at an applied potential below the RuV=O/RuIV=O couple clearly support such a
mechanism. However, in the cases of [Ru(tpy)(bpy)(OH2)]2+
and [Ru(tpy)(bpm)(OH2)]2+, the formation of the RuV=O
species is required before O–O bond formation. Our complexes provide a
unique functional model for water oxidation that proceeds by four
consecutive PCET steps in neutral and alkaline media.
Inorg. Chem. 2013, 52, 8845–8850, DOI: 10.1021/ic401023w