Redox Properties of CeDOTA in Carbonated Aqueous Solutions. A Radiolytic and an Electrochemical Study.

The redox chemistry of CeDOTA in carbonate solutions was studied using electrochemistry and radiolysis techniques (continuous radiolysis and pulse radiolysis). Spectroscopic measurements point out that the species present in the solutions at high bicarbonate concentrations are [CeDOTA(CO)] (or less plausible [CeDOTA(HCO)]) with the carbonate (bicarbonate) anion as the ninth ligand versus [CeDOTA(HO)] present in the absence of bicarbonate. Electrochemical results show a relatively low increase in the thermodynamic stabilization of the redox couple Ce in the presence of carbonate versus its aqueous analogue.