Sodium tungstate

Sodium tungstate
IUPAC name

Sodium tungstate
Identifiers
CAS number 13472-45-2 Y
PubChem 165917
RTECS number YO7875000
Properties
Molecular formula Na2O4W
Molar mass 293.82 g mol−1
Appearance white rhombohedral crystals
Density 4.179 g/cm3
Melting point

698°C
Solubility in water 74.2 g/100 mL[1]
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Sodium tungstate, Na2WO4, a tungstate of sodium, is useful as a source of tungsten. It is prepared from tungsten ores used to manufacture tungsten by reducing it.

It is often found as the dihydrate, Na2WO4•2H2O. This salt is soluble in water and is a moderately strong oxidizing agent. Like the molybdate, the deep-coloured complex tungstate(VI,V) is formed on reducing the compound with a very mild reducing agent, such as complex organic compounds. It is also thought to be a possible inhibitor of protein-tyrosine phosphatase (PTPase)[2]. It is also sometimes used as a fireproofing agent.

In organic chemistry, sodium tungstate is used as catalyst for epoxidation of alkenes and oxidation of alcohols into aldehydes or ketones.

It is also known for its anti-diabetic effects; Researchers have identified the pathways through which sodium tungstate improves pancreatic function and beta cell proliferation. [3]

References

  1. ^ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 486, ISBN 0-8493-0594-2 
  2. ^ Structural basis for the function and regulation of the receptor protein tyrosine phosphatase CD45. J Exp Med. 2005 February 7; 201(3): 441–452.
  3. ^ The Antidiabetic Agent Sodium Tungstate Activates Glycogen Synthesis through an Insulin Receptor-independent Pathway. The Journal of Biological Chemistry, Vol. 278, No. 44, Issue of October 31, pp. 42785–42794, 2003.

External links