New multi-cobalt-containing polyoxometalates (POMs) are soluble, fast and tunable water oxidation catalysts (WOCs).
We report additional studies of [Co4(H2O)2(PW9O34)2]10- (1), a very fast, soluble and oxidative stable WOC: new kinetics
data further indicate that Co2+ is not kinetically important in water oxidations catalyzed by 1. Second, we report a new
WOC, [{Co4(ì-OH)(H2O)3}(Si2W19O70)]11- that coexists in a 1:1 ratio in the solid state (2a and 2b), and while it is
oxidatively stable, it is not hydrolytically stable, rearranging to [Co(H2O)SiW11O39]6- in aqueous solution. All these
studies provide insights relating structural, electronic and other features of these WOCs to their reactivity and stability.
|