Organic polymers are central to the development of new functional materials for renewable energy, biosensors, and medicinal applications. The electronic structure of organic polymers is highly sensitive to degrees of conjugation, structure of the monomer unit, backbone morphology, and noncovalent interactions between polymer chains. Organic polymers that undergo reversible changes in redox state are valuable for organic electronics, organic solar cells (photovoltaics), and organic charge storage materials (batteries). We have developed stable radicals that function as n-type (good electron donors), and p- type(good electron acceptors) for incorporation into conjugated polymer backbones. These materials show exceptional properties as battery materials, photovoltaic materials, and organic spintronic materials, in which charge (redox state) and spin are highly correlated.