Ferrous tungstate

Ferrous tungstate

Names
IUPAC names Iron(2+) dioxido(dioxo)tungsten [ACD/IUPAC Name] Tungsten, diolatodioxo-, iron(2+) salt (1:1) [ACD/Index Name]
Other names Iron(II) tungstate
Identifiers
CAS Number	20405-35-0
3D model (JSmol)	Interactive image
ChemSpider	11214118
ECHA InfoCard	100.034.188
PubChem CID	22178528
CompTox Dashboard (EPA)	DTXSID00623278
InChI InChI=1S/Fe.4O.W/q+2;;;2*-1; Key: SSWAPIFTNSBXIS-UHFFFAOYSA-N
SMILES [O-][W](=O)(=O)[O-].[Fe+2]
Properties
Chemical formula	FeWO4, sometimes expressed FeO4W
Molar mass	303.68 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Ferrous tungstate (FeWO₄) is an inorganic compound, a tungstate of ferrous iron. It occurs naturally as ferberite.

Synthesis

It can be synthesized from iron(III) chloride and sodium tungstate under hydrothermal conditions where the presence of L-cysteine reduces Fe³⁺ to Fe²⁺.

FeWO₄ crystals can be prepared by hydrothermal synthesis. Reagents used in this process are ethylenediaminetetraacetic acid disodium salt (Na₂EDTA) and hexamethylenetetramine (HMT). Na₂EDTA helps in controlling the morphology of FeWO₄ crystals by binding to metal ions and preventing their premature precipitation and HMT acts as a pH buffer and a source of ammonia.

References