The simplest possible hydrogen polyoxide (the parent molecule) is water, H2O. The general structure of the class of molecules is some number of oxygen atoms single-bonded to each other in a chain. The oxygen atom at each end of this oxygen skeleton is attached to a hydrogen atom. Thus, these compounds form a homologous series with chemical formula H 2O n in which the members differ by a constant relative molecular mass of 16 (the mass of each additional oxygen atom). The number of oxygen atoms is used to define the size of the hydrogen polyoxide (e.g., hydrogen pentoxide contains a five-oxygen backbone).
An oxidanyl group is a functional group or side-chain, that like a hydrogen polyoxide, consists solely of single-bonded oxygen and hydrogen atoms: for example, a hydroxy (oxidyl) or hydroperoxy (dioxidanyl) group.
^ abLevanov, Alexander V.; Sakharov, Dmitri V.; Dashkova, Anna V.; Antipenko, Ewald E.; Lunin, Valeri V. (2011). "Synthesis of Hydrogen Polyoxides H2O4 and H2O3 and Their Characterization by Raman Spectroscopy". European Journal of Inorganic Chemistry. 2011 (33): 5144–5150. doi:10.1002/ejic.201100767.CS1 maint: uses authors parameter (link)
^Xin Xu and William A. Goddard III. Peroxonechemistry: Formation of H2O3 and ring-(HO2)(HO3) from O3/H2O2
^Martins-Costa, Marilia; Anglada, Josep M.; Ruiz-Lopez, Manuel F. (2011). "Structure, stability, and dynamics of hydrogen polyoxides". International Journal of Quantum Chemistry. 111 (7–8): 1543–1554. doi:10.1002/qua.22695.CS1 maint: uses authors parameter (link)