One example is hydrogen peroxide, H 2 O 2 . It has a high dielectric constant, but its utility as an ionising solvent is limited by its strong oxidising nature and its ready decomposition in the presence of even traces of impurities. Other oxygen-hydrogen species are possible. Oxygen-hydrogen free radicals such as HO 2 and OH are important in many reactions involving hydrogen peroxide. Ionic oxygen-hydrogen species are also known.
Water dissociates into hydrogen ion and hydroxide ion.
Hydrogen ions themselves do not exist as identifiable species in water. Ionic superoxides are very powerful oxidising agents which react with water to produce HO 2 - ions.