Periodate
 The metaperiodate ion
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 The orthoperiodate ion
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Systematic IUPAC name
tetraoxoiodate(1−)
hexaoxoiodate(5−) |
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3D model (Jmol)
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PubChem CID
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Other anions
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Perchlorate Perbromate Permanganate |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Periodate /pəˈraɪ.ədeɪt/ is an anion composed of iodine and oxygen. It is one of a number of oxyanions of iodine and is the highest in the series, with iodine existing in oxidation state +7. Unlike other perhalogenates, such as perchlorate, it can exist in two forms: metaperiodate IO−
4 and orthoperiodate IO5−
6. In this regard it is comparable to the tellurate ion from the adjacent period. It can combine with a number of counter ions to form periodates, which may also be regarded as the salts of periodic acid.
Periodates were discovered by Heinrich Gustav Magnus and C. F. Ammermüller; who first synthesised periodic acid in 1833.
Classically, periodate was most commonly produced in the form of sodium hydrogen periodate (Na3H2IO6). This is commercially available, but can also be produced by the oxidation of iodates with chlorine and sodium hydroxide. Or, similarly, from iodides by oxidation with bromine and sodium hydroxide:
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