- A salt of periodic
The periodate ion is IO4− or
IO65−. It comes from periodic
A periodate is a compound that contains this
group. Note that the pronunciation is per-iodate, not
for a bigger list.
Periodates include two forms. The metaperiodate
ion is IO4−; the orthoperiodate ion is
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
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
or a carbonyl
group. This property
is often utilized in molecular biochemistry for the purposes of
rings, as many five- and six-membered sugars often have vicinal diols
periodate in Russian: