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This is commercially available, but can also be produced by the oxidation of iodates with chlorine and sodium hydroxide. The structure of metaperiodic acid also includes IO 6 octahedra, however these are connected via cis-edge-sharing with bridging oxygens to form one-dimensional infinite chains. Expanding the scope of the Babler–Dauben oxidation: 1,3-oxidative transposition of secondary allylic alcohols".

H 5 IO 6 + H + + 2 e − ⟶ IO 3 − + 3 H 2 O {\displaystyle {\ce {H5IO6 + H+ + 2e- -> IO3- + 3 H2O}}} E° = 1.This can be useful in determining the structure of carbohydrates as periodic acid can be used to open saccharide rings. Crystal Structure Determination of Metaperiodic Acid, HIO 4, with Combined X-Ray and Neutron Diffraction". It is one of a number of oxyanions of iodine and is the highest in the series, with iodine existing in oxidation state +7.

It can combine with a number of counter ions to form periodates, which may also be regarded as the salts of periodic acid. It can exist in two forms: orthoperiodic acid, with the chemical formula H 5IO 6, and metaperiodic acid, which has the formula HIO 4.Orthoperiodic acid forms monoclinic crystals ( space group P2 1/ n) consisting of a slightly deformed IO 6 octahedron interlinked via bridging hydrogens. F. Holleman; continued by Egon Wiberg; translated by Mary Eagleson, William Brewer; revised by Bernhard J. Periodate is part of a series of oxyacids in which iodine can assume oxidation states of −1, +1, +3, +5, or +7.

Periodic acid ( / ˌ p ɜːr aɪ ˈ ɒ d ɪ k/ per-eye- OD-ik) is the highest oxoacid of iodine, in which the iodine exists in oxidation state +7.Periodic acid is also used as an oxidising agent of moderate strength, as exemplified in the Babler oxidation of secondary allyl alcohols which are oxidised to enones by stoichiometric amounts of orthoperiodic acid with catalyst PCC.