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The periodate ion is IO4 or IO65−. It comes from periodic acid.

A periodate is a compound that contains this group. Note that the pronunciation is per-iodate, not period-ate.


See category for a bigger list.


Periodates include two forms. The metaperiodate ion is IO4; the orthoperiodate ion is IO65−.

Periodate compounds include metaperiodates and orthoperiodates. Usually both are called periodates.

In neutral or weak acid conditions, IO4 is most common, in equilibrium with a smaller amount of H4IO6. In basic conditions, H3IO62− is formed, plus some other ions.

Like its neighbor, tellurium, and unlike lighter halogens, iodine tends to be hexacoordinate, and the units HnIO6(5−n)- are quite common; but in the case of iodine, tetracoordinate units, such as IO4, are also quite common.


Periodates can cleave carbon-carbon bonds when both carbon atoms bear an oxygen atom, either in the form of a hydroxyl or a carbonyl group. This property is often utilized in molecular biochemistry for the purposes of modifying saccharide rings, as many five- and six-membered sugars often have vicinal diols.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Periodate". A list of authors is available in Wikipedia.
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