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The redox chemistry of quercetin (Qz) and its iron(II) complexes has been studied in dimethylsulfoxide. In the absence of base an Fe(II):Qz=1:1 complex is formed which presents oxidation processes at 0.28 V vs. S.C.E.; 0.66 V vs. S.C.E. and 0.92 V vs. S.C.E. These processes correspond to the oxidation of Fe(II) to Fe(III), the formation of the quinonic form of the catecholic moiety and the oxidation...
The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one equivalent of charge per complex present, as indicated by controlled-potential electrolyses done at +0.30V versus...
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