Paratungstate

In chemistry, paratungstate refers to the anion with the formula [W12O42]12− and salts derived from this anion. The term also refers to protonated derivatives of this anion, including [H2W12O42]10−. Ammonium paratungstate (or APT), (NH4)10[H2W12O42] is a key intermediate in the purification of tungsten from its ores.

Structure of the paratungstate [H2W12O42]10−, highlighting its relatively low symmetry.

The salt (NH4)10[H2W12O42]·4H2O has been characterized by X-ray crystallography.

The unprotonated anion [W12O42]12− has C2h symmetry.

See also

References

  1. ↑ Lassner, Erick; Schubert, Wolf-Dieter; Lüderitz, Eberhard; Wolf, Hans Uwe. "Tungsten, Tungsten Alloys, and Tungsten Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a27_229. ISBN 978-3-527-30673-2.
  2. ↑ d'Amour, Hedwig; Allmann, Rudolf (1972). "Die Kristallstruktur des Ammoniumparawolframat-tetrahydrats (NH4)10[H2W12O42]·4H2O". Zeitschrift für Kristallographie. 136 (1–2): 23–47. Bibcode:1972ZK....136...23D. doi:10.1524/zkri.1972.136.1-2.23.