Journal of The Electrochemical Society · 1974 · 121 citations · 0 references
Natural SciencesChemical EngineeringChemistryElectrochemistryOptical MaterialsOptoelectronicsColor ChemistryElectrochromic MaterialsOptoelectronic MaterialsPhotochemistryPhotoelectrochemistryRedox-active MaterialsElectrochromic DevicesFilm Color ProcessesLight AbsorptionOxidation-induced Color ChangeViologen-based Materials
Electrochemical reactions that produce a change of light absorption in the visible region can be used in display devices. The reduction of the 4,4'‐di‐pyridinium compounds or viologens to stable blue radicals is very promising in this respect. It was found that in aqueous solution the solubility of the radical is remarkably lower than that of the oxidized form. It turned out that the solubility depends on the kind of anion and the magnitude of the viologen radical ion.