Organic PolyRadicals as Redox Mediators : Effect of Intramolecular Radical Interactions in their Efficiency

The spin-spin interactions between unpaired electrons in organic (poly)radicals, especially nitroxides, are of largely investigated and are of crucial importance for their applications in areas such as organic magnetism, molecular charge transfer or multiple spin labeling in structural biology. Recently, TEMPO and polymers functionalized with nitroxides have been described as successful redox mediators, however, the study of spin-spin interactions effect in such an area is absent. This communication deals with the preparation and study of a novel family of discrete polynitroxide molecules, with the same number of radical units but different arrangement to study how intramolecular spin-spin interactions affect on their electrochemical potential and their use as redox mediators.