Abstract
Electrochemical investigations of liquid sulfur dioxide solutions a t -40 OC are reported. Cyclic voltammetric and coulometric studies of the oxidations of thianthrene (TH) , phenothiazine (PH) , and 9, IO-diphenylanthracene (DPA) in SO2 containing 0.15 M tetra-n-butylammonium perchlorate show that all three compounds are oxidized in two reversible one-electron steps to their respective radical cations and dications. Controlled potential coulometric studies with reversal show that both the radical cations and dications of T H and P H are stable on the coulometric time scale (-2 h), but DPA dication is
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