Sodium perrhenate (also known as sodium rhenate(VII)) is the
inorganic compound with the formula NaReO
4. It is a white salt that is soluble in water. It is a common precursor to other
rhenium
Rhenium is a chemical element with the symbol Re and atomic number 75. It is a silvery-gray, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one ...
compounds. Its structure resembles that of
sodium perchlorate
Sodium perchlorate is the inorganic compound with the chemical formula Na ClO4. It is a white crystalline, hygroscopic solid that is highly soluble in water and in alcohol. It is usually encountered as the monohydrate. The compound is noteworth ...
and
sodium permanganate
Sodium permanganate is the inorganic compound with the formula Na MnO4. It is closely related to the more commonly encountered potassium permanganate, but it is generally less desirable, because it is more expensive to produce. It is mainly avai ...
.
Preparation
It can be prepared by treatment of
rhenium heptoxide with base or by
ion exchange
Ion exchange is a reversible interchange of one kind of ion present in an insoluble solid with another of like charge present in a solution surrounding the solid with the reaction being used especially for softening or making water demineralised, ...
from the potassium salt.
Sodium perrhenate can be prepared from rhenium metal with hydrogen peroxide in the presence of base.
:
2 Re + 7 H2O2 + 2 NaOH -> 2 NaReO4 + 8 H2O
Reactions
It reacts with sodium in ethanol to give
nonahydridorhenate.
[
Sodium perrhenate has been used as a precursor of rhenium nitrides (such as Re3N, Re2N, Re3N2, ReN2, ReN3, ReN4), which can be used as catalysts for ammonia synthesis and for hydro-denitrogenation.][
]
References
Further reading
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Sodium compounds
Perrhenates
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