NOTE: in this case the reagent is formic acid
Scavenger of Oxygen. Formic acid was shown to scavenge oxygen dissolved in water in presence of a water-soluble heterodinuclear iridium–ruthenium complex, [IrIII(Cp*)(H2O)(bpm)RuII(bpy)2](SO4)2. In presence of this catalyst, formic acid decomposes to hydrogen and CO2. The new Ir(III) species generated in the basic pH subsequently reacts with
0.5 equiv of oxygen that undergoes a four-electron reduction and the catalyst is regenerated. Oxygen reduction is proposed to occur via Ir(III)-peroxo and an Ir(V)-oxo complex (eq 38).
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